9th Class Biology Chapter 2 Short Questions with Answers Solved

Question: 1

What is scientific method?

Answer: 1

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The scientific method in which biological problems are solved, is termed as biological method. Example: Study of Malaria.

Question: 2

What is the importance of biological method?

Answer: 2

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From Galileo's experiment back in 1590s to current research, the biological method contributed to the advancements in medicine, ecology, technology etc, biological method ensure the quality of data for public use.

Question: 3

What is Science?

Answer: 3

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Science is the systemized knowledge derived from observation and experiments these experiments are carried out to determine the principles about how nature operates.

Question: 4

What is necessary for the formulation of a hypothesis.

Answer: 4

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A great deal of careful and creative thinking is necessary for the formulation of a hypothesis.

Question: 5

Define hypothesis.

Answer: 5

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The tentative explanation of the observations is called hypothesis.

Question: 6

What are different kind of observations?

Answer: 6

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Observations may be qualitative and quantitative.

Question: 7

Define biological problem.

Answer: 7

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A biological problem is a question related to living organisms that is either asked by someone or comes in biologist's mind by himself.

Question: 8

Define observation.

Answer: 8

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Opinion which is made with the help of five senses of vision, hearing, smell, taste and touch is called observation.

Question: 9

Write the deduction process.

Answer: 9

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The logical consequences of the hypothesis are called deductions. for this purpose, a hypothesis is taken as true and expected results are drawn from it.

Question: 10

Give two example of qualitative and two of quantitative observations.

Answer: 10

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Qualitative observations: The freezing point of water is colder than the boiling point. A liter of water is heavier tha a liter of ethanol

Question: 11

Which steps are taken by biologists to solve a biological problem?

Answer: 11

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Following steps are taken by biologists to solve a biological problem. i. Recognition of biological problem ii. Observations iii. Hypothesis formulation iv. Deductions v. experimentation. vi Summarization of result. vii. Reporting the results.

Question: 12

Different between theory and law.

Answer: 12

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Theory:The hypotheses that stand the test of time are called theories. Example: Cell theory

Question: 13

Define control group.

Answer: 13

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A set up of experiment in which no variable is missing and is a known measures to which scientist can compare their results.

Question: 14

What role does this step play in scientific method?

Answer: 14

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Publishing of results is an essential part of the scientific method, it allows other people to verify the results or apply the knowledge to solve other problems.

Question: 15

Define experimental group.

Answer: 15

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A set up of experiment in which one variable being tested is kept missing is called experimental group

Question: 16

What are symptoms of malaria.

Answer: 16

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Malaria is diagnoses by having chills and fever with recurring attacks in patients.

Question: 17

How was plasmodium discovered?

Answer: 17

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In 1878 a French army physician Laveran took small amount of blood from a malarial patient and after examining under microscope, noticed some tiny creatures, which after five years was given a name plasmodium.

Question: 18

What is the cause of malaria?

Answer: 18

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A tiny creature, plasmodium is the cause of malaria.

Question: 19

What is meaning of malaria?

Answer: 19

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The Italian words "mala" means bad and "aria"means air.

Question: 20

What is quinine?

Answer: 20

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The substance extracted from cinchona bark to treat malaria is caleld pquinine.

Question: 21

Name any one biological problem.

Answer: 21

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Malaria is a biological problem.

Question: 22

What is plasmodium ?

Answer: 22

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Plasmodium is a microorganism which completes its life cycle in mosquito and man and causes malaria in animals and humans.

Question: 23

What is cinchona?

Answer: 23

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Cinchona is a tree, the bark of which was found to be excellent remedy for treating malaria.

Question: 24

Define variable.

Answer: 24

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Variable is a factor being tested in and experiment and is usually compared to a control group.

Question: 25

Define anopheles.

Answer: 25

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Anopheles is a kind of mosquito, female of this mosquito spread malaria in human beings.

Question: 26

Define culex.

Answer: 26

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Culex is a kind of mosquito, female of which spreads malaria in sparrows.

Question: 27

What was the contribution of Ronald Ross to test deductions by A.F. King?

Answer: 27

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Ronald Ross, a British army physician working in India in 1880's allowed female Anopheles mosquito to bite a malarial patient, he killed the mosquito some days later and found plasmodium multiplying in mosquito's stomach.

Question: 28

Define ratio.

Answer: 28

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When a relation between two numbers e.t. 'a' and 'b' is expressed in terms of quotient (a/b) such a relation is the ratio of one number to the other it is expressed by putting a (+) division or colon);) mark b/w two numbers.

Question: 29

What is the role of Hypothesis.

Answer: 29

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Biologist organize his her and others observation into into data form and constructs a statement that may prove to be the answer of the biological problem under study.This tentative explanation of observation is called a hypothesis

Question: 30

What is meant by data organization?

Answer: 30

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The collection and rearrangement of information to formulate and to test hypothesis is called data organization.

Question: 31

Write two characteristics of good hypothesis.

Answer: 31

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It should be a general statement.
It should be a tentative idea.
It should agree with available observation.
It should be kept as simple as possible.

Question: 32

Give two example of bioloigical law.

Answer: 32

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Hardy weinberg law , Mendel's law of inheritance.

Question: 33

What is meant by biological problems ?

Answer: 33

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A biological problem is a question related to livings organisms that is either asked by someone or comes in biologist's mind by himself.

Question: 34

How dowws plasmodium enter the body of a mosquito.

Answer: 34

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When a mosquito bits and sucks the blood of malarial patient the plasmodium enter in it body.

Question: 35

Difference between Scientific and biological ?

Answer: 35

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Scientific Method:The method which is used by the scientific to sole a problem is called a Scientific method

Question: 36

Define Law of principle.

Answer: 36

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A theory, which survives doubtful approaches and continues to be supported by experimental evidences, is called law or principle. Example: Mendel's law of inheritance.

Question: 37

Define proportion.

Answer: 37

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Proportion means to join two equal ratios by the sing of equality (=) e.g. a:b =c:d is a proportion between two ratio.

Question: 38

Write down two controls of malaria.

Answer: 38

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controls of malaria:

If sleeping place are open then use smokey fire to keep away mosquitoes.
Use for wire guaze on windows and doors are keep away mosquitoes to control malaria
Use of mosquitoes repellent in the form of location on the skin

Question: 39

Define data.

Answer: 39

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Data can be defined as the information such as names dates or values made from observations.

Question: 40

Write two observation of A.F.A king ?

Answer: 40

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People who slepts outdoor were more likely to get malaria than those who spent indoors.
People who slepts under fine net were less likely to get malaria than those who did not use such nets.
Individual who slept near a smokey fire usually did not get malaria

Question: 41

What is incubation periods?

Answer: 41

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The time period between the entry of parasite in host and appearance of symptoms of its attack is called incubation periods.

Question: 42

Define theory.

Answer: 42

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The hypothesis that stand the test of time are called theories. ?A theory is supported by a great deal of evidence. Example: Theory of evolution.

Question: 43

What is the contribution of A.F.A. king to solve biological problem of malaria.

Answer: 43

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In 1883 a physician. A.F.A. king, made 20 observations then suggested hypothesis that the "Mosquitoes transmit plasmodium and are involved in spread of malaria."

Question: 44

Define biological method

Answer: 44

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The scientific method in which biological problem are solved in termed as biological method

Question: 45

Explain Deduction?

Answer: 45

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Deduction are the logical consequences of hypothesis.For this purpose a hypothesis is taken as true and expected results are drawn from it

Question: 46

What was the name of first medicine of malaria curing?

Answer: 46

46-154

The bark of a trce known as quina quina was very suitable for curing malaria.

Question: 47

What do you mean by the word malaria?

Answer: 47

47-154

The Italian words "Mala" means bad and "aria" mean "air"

Question: 48

Define hypothesis ?

Answer: 48

48-154

this tentative explanationof observation is called a hypothesis.

Question: 49

What is the role of biological method in biology?

Answer: 49

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Biological method has played an important part in scientific research for almost 500 years

Question: 50

What is proportion?

Answer: 50

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Proportion mean to join two equal ratios by sign of equality (=)

Question: 51

What is biological Method ?

Answer: 51

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The scientific method on which biological problems are solved is called biological method.

Question: 52

Define bioinformatics.

Answer: 52

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Bioinformatics refers to the computational and statistical techniques for the analysis of biological data.

Question: 53

In which mosquito plasmodium is found?

Answer: 53

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Mosquitoes transmit plasmodium and so are involved in the spread of malaria.

Question: 54

Write down the name of two steps included in biological method ?

Answer: 54

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Recognition of biological problems
Observation
Hypothesis formulation
Deductions
Experimentation

Question: 55

How we can say man has always been a biologist?

Answer: 55

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Man has always been a biologist. He had to be biologists. He had to be biologists in order to live The more he knew about animals and their habitat, the more successful hunter he was.

Question: 56

Define biological problems?

Answer: 56

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This happen when biological recognize some biological problem and go for it solution biologists takes following steps.Recognition of biological problem observation.
i) Hypothesis Formulation.
ii) Deduction
iii) Experiment.

Question: 57

What is difference control group and experimental group?

Answer: 57

57-154

In science when doing the experiment It must be a controlled experiment the scientist must an experiment group with control group.The two group are treated exactly like except for the one variable bing tested.

Question: 58

How is a scientific law formed?

Answer: 58

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productive theory keeps on suggesting new hypothesis and so testing goes on.many biologists take it as a challenge and exert greater efforts to disprove the theory.

Question: 59

What was the biologist,observation about malaria?

Answer: 59

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Biologist were having following observation.Malaria is associated with marshes.Drinking water of marches does not cause malaria.From these observation it can be concluded that plasamodium was not in marsh,water.But it must be carried by something that comes to marsh water.

Question: 60

What is proportion?

Answer: 60

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Proportion mean to join two equal ratios by sign of equality(=).

Question: 61

Define scientific Method ?

Answer: 61

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The method which is used by all scientific to solve a problems is called scientific method.

Question: 62

Differentiate between Qualitative and quantitative observation ?

Answer: 62

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Quantitative observation are considered more accurate than qualitative one because the former are invariable and measurable and can be recorded in term of number.

Question: 63

Define Theory ?

Answer: 63

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The hypothesis that stand the test of time are called theory. A theory is supported by a great deal of evidence.

Question: 64

Write down contribution of French Army physician Laveran?

Answer: 64

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In 1883, a French Army physician Laveran began to search for "cause" of malaria. He took a small amount of microscope

Question: 65

Write down two benefits of Productive Theory

Answer: 65

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Benefits of productive Theory: A productive theory produces new hypothesis and its further testing goes on

If Any productive theory can not be falsified then it becomes a law or Principle

Question: 66

Write three steps of solving biological problem?

Answer: 66

66-154

In solving biological problem biologists takes following steps.
Observation
Hypothesis formulation
Deduction.

Question: 67

How aedes mosquito spreads dengue fever ?

Answer: 67

67-154

When Aedes mosquito bits on skin of any person then it pierces the skin with its mouth parts and sucks blood and injects a small amount of saliva there.

Question: 68

What is trachea?

Answer: 68

68-154

The trachea is 12 cm long tube it lies in front of the esophagus.It is also called as windpipe.These are c-shaped cartilaginous nines in the wall of trachea from collapsing even when these is no air in it.

Question: 69

What are different formats of Data Organization

Answer: 69

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In order to formulate and then to test hypothesis scientists collect and organize data Prior to conducting an experiment it is very important for a scientist to describe data collection methods It ensures the quality of experiment Data is organized in different formats like graphics tables flow charts, maps and diagrams

Question: 70

What is meant by observation ?

Answer: 70

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As the first step in solving a biological problems, biologist recalls his/her pervious observation or makes new one

Question: 71

Difference between law and theory?

Answer: 71

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Law :

If a theory survives such doubtful approach and continuesto be supported by experimental evidence. It become a law of principle

Question: 72

Differentiate between control and experimental control group ?

Answer: 72

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Control group:Group of healthy persons is called control group

Question: 73

What are the observation of AFA King?

Answer: 73

73-154

Some important observation of AFA King were

people who slept outdoormore likely to get malaria than those who slept indoors

Individual who slept neat a smoky fire usually did not get malaria

Question: 74

What is meant by observation

Answer: 74

74-154

As the first step in solving a biological problem biologist recalls his previous observations or makes new ones observations are made with five senses of vision hearing smell taste and touch

Question: 75

What is female Anopheles and to which diseases it related ?

Answer: 75

75-154

Female Anopheles is a mosquito which spreads plasmodium it relates to malaria.

Question: 76

Write two examples of Biological Laws

Answer: 76

76-154

Two exampes of Biological laws are

Question: 77

Define Experiment and their types?

Answer: 77

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The most basic step of biological method is experiment biologist performs experiment to see if hypothesis are true or not.
Control Group
Experimental Group.

Question: 78

In which language does the malaria belongs

Answer: 78

78-154

Malaria belongs to Italian words malamean bad and aria mean air

Question: 79

At which Quantitative observation is more accurate than Quantitative

Answer: 79

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Quantitative observations are considered more accurate than qualitative one because the former are invariable and measurable and can be recorded in terms of numbers

Question: 80

What is Incubation Periods

Answer: 80

80-154

The time period between the entry of parasite in host and appearance of symptoms of its attack is known as Incubation period

Question: 81

Define Observation and Types?

Answer: 81

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As a first step in solving a biological problem biologists recall his/her previous observation or make new ones.Observation are made with five sense of vision hearing smell,taste,touch.

Question: 82

What is meant by Summarization of results ?

Answer: 82

82-154

Biologist collect the actual and quantitative data from his experiments data from his experiments.
An average data is collected form every experimental group and than statistical comparison is made
for final conclusion biologist also makes statistical analysis

Question: 83

What is meant by reporting of results ?

Answer: 83

83-154

biologists publish their findings in scientific journal and books in talk at national and international meetings and in seminar at colleges and universities

Question: 84

How many senses are found in man?

Answer: 84

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Five sense are found in man.

Question: 85

What is meant by control in experiments?

Answer: 85

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Control Experiments:

When an experiments is done, it is a controlled experiments.
In the Experiments, Scientific compare experiments group to control group
Both groups are kept in same environment expect the testable variable

Question: 86

How Aedes mosquito spreads Dengue fever

Answer: 86

86-154

When Aedes mosquito bites on the skin of any person then it pierces the skin with its mouth parts and such blood and injects a small amount of saliva there This saliva contains germs of Dengue which latter causes Dengue fever

Question: 87

Was the ancient physician familiar with malaria?

Answer: 87

87-154

In ancient time physiam were familar with malaria.They described it as a disease of chills and fever with recurring attacks.

Question: 88

How we can say man has always been a biologist

Answer: 88

88-154

Man has always been a biologist He had to be a biologist in order to live The more he knew about animals and their habitat the more successful hunter he was

Question: 89

Differentiate between culex and Aedes moquitoes?

Answer: 89

89-154

Culex moquitoes:Culex moquitoes are responsible for malaria in sparrow.

Aedes moquitoes:Aedes moquitoes are responsible for the dengue fever in human.

Question: 90

What is scientific law

Answer: 90

90-154

Productive theory keeps on suggesting new hypothesis and so testing goes on Many biologists take it as a challenge and exert greater efforts to disprove the theory If a theory survives such doubtful approach and continues to be supported by experimental evidence it becomes a law or principle A scientific law is a uniform or constant fact of nature It is an irrefutable theory Examples of biological laws Hardy Weinberg law and Mendel's laws of inheritance

Question: 91

What were four observation of malaria in the last part of 19th century?

Answer: 91

91-154

Malaria and marshy areas have some relation.
Quinine is an effective drug for treatingmalaria.
Drinking the water of marshes does not casemalaria.
Plasmodim is seen in the blood ofmalaria patients.

Question: 92

What is female Anopheles and to which disease it relates

Answer: 92

92-154

Female Anopheles is a mosquito which spreads plasmodium and it relates to malaria

Question: 93

Write down importance of saliva for mosquito.?

Answer: 93

93-154

The saliva for mosquito prevents the blood from clotting in her food canal

Question: 94

What is role of Biological method in Biology

Answer: 94

94-154

Biological method has played an important part in scientific research for almost 500 years From Galileo's experiment in the 1590s to current research the biological method has contributed to the advancements in vaccine medicine ecology technology etc Biological method also ensures the quality of data for public use Over population discovery of new diseases and mutations in germs are factors which are responsible to change the environment of globe only biological method can play an important role to save our next generations

Question: 95

Define observation and types

Answer: 95

95-154

As a first step in solving a biological problem biologists recallhis/her previous observation or make new ones. Observation are made with five senses of vision hearing smell, taste, touch.

Types are:

Qualitative observation

Quantitative observation

Question: 96

Write two example of biological Laws ?

Answer: 96

96-154

Hardy-Weinberg Law
Mendel's Law

Question: 97

Define Ratio and Proportion

Answer: 97

97-154

Ratio: When the relation between a and is expressed in the form of quotient then such relation is called a ratio A two quantities For example the ratio between 50 malarial patient and 150 healthy patients is 1.3

Question: 98

Why do we do itching after biting of mosquito ?

Answer: 98

98-154

When a female mosquito pierces the skin with her mouth parts she injects a small amount of saliva into the wound before drawing blood.

Question: 99

Differentiate between Control and Experimental control group

Answer: 99

99-154

Control Group: Group of healthy persons is called control group

Example: In an experiment to test a necessity of carbon dioxide for photosynthesis plant with freely available carbon dioxide is control group

Question: 100

What do you known Quina?

Answer: 100

100-154

Quina is an effective drug for treating malaria.

Question: 101

What is meant by Control in Experiments

Answer: 101

101-154

Control in Experiment: When an experiment is done It is a controlled experiment

In this experiment Scientist compares experimental group to control group

Both groups are kept in same enviroment except the testable variable

Question: 102

What is statistics?

Answer: 102

102-154

Statistics is the brameh of mathematics dealing with data collection organization analysis interpretation and presentation.

Question: 103

Define law and principal

Answer: 103

103-154

if a theory survives such doubtful approach and continues to be supported by experimental evidence. It becomes a law of principal.

Question: 104

Why female mosquito inject saliva wound before drawing blood.?

Answer: 104

104-154

A female mosquito injects a small amount of saliva into the wound before drawings blood. so that, the saliva prevents the blood from clotting in her food canal, due to presence of anti-coagulant.

Question: 105

What is the relation of Cinchona with quina-quina ?

Answer: 105

105-154

Many plants of america were sent back to Europe to be used as medicines. the brak of a tree known as quina-quina. Was very suitable for curing fevers

Question: 106

What do you know Quina?

Answer: 106

106-154

Quina is an effective drug for treating malaria

Question: 107

What is meant by Productive Theory ?

Answer: 107

107-154

The theory that keep on the suggesting new hypothesis and so testing goes on is called productive theory

Question: 108

Define Hypothesis

Answer: 108

108-154

Tentative explanation of observations is called hyhpothesis

Question: 109

Define biological method?

Answer: 109

109-154

The scientific method in which biological problem are solved in termed as biological method.

Question: 110

What is Bio-Informatics

Answer: 110

110-154

Bioinformatics refers to the computational and statistical techniques for the analysis of biological data

Note no board has taken any question

Question: 111

What is plasmodium

Answer: 111

111-154

Plasmodium is seen in the blood of malaria patients

Question: 112

Define theory and laws ?

Answer: 112

112-154

Theory:The hypothesis that stand the test of time often tasted and never rejected are called theory

Question: 113

What is the relation of Cinchona with quina-quina

Answer: 113

113-154

Many plants from America were sent back to Europe to be used as medicines The bark of a tree known as quina- quina was very suitable for curing fevers It was so beneficial that soon it was impssible to carry enough bark to Europe Some dishonest merchants began to substitute the bark of another tree cinchona a which closely resembled quina- quina This dishonesty proved much valuables for mankind Cinchona bark was found to be excellent for treating malaria

Question: 114

Write down contribution of French Army physician Laveran

Answer: 114

114-154

In 1878 a French army physician Laveran began to search for cause of malaria He took a small amount of blood from a malarial patient and examined it under microcope He notices some tiny living creatures His discovery was not believed by other scientist Two years later another physician saw the same creatures in the blood of another malarial patient Three years after the second discovery the same creature s were observed for third time The organism was given a name Plasmodium

Question: 115

What are the observation of A.F.A king?

Answer: 115

115-154

Some important observation of A.F.A king were people who slept outdoor more likely to get malaria than those who slept indoors.

Question: 116

What is difference between control group and experimentalgroup?

Answer: 116

116-154

In science when doing the experimentit must be a controlled experiment the scientists must contrastin experiment group with control group . The two groupare treated exactly alike except for the one variable bing tested

Question: 117

What were the four major observations of malaria in the last part of 19th century

Answer: 117

117-154

Malaria and marshy areas have some relation

Quinine is an effective drug for treating malaria Drinking the water of marshes does not cause malaria

plasmodium is seen in the blood of malarial patients

Question: 118

What was the biologist, observation about malaria?

Answer: 118

118-154

Biologist were having following observation

Malaria is associated with marshes

Drinking water of marches does not cause malaria. Form these observationit can be concluded that plasmodiumwas not in march water But it must be carried by something that come to march water,

Question: 119

Define Theory?

Answer: 119

119-154

The hypothesis that stand the best of time are called theory.A theory is supported by a great deal of evidence.

Question: 120

Write characteristics of a Hypothesis

Answer: 120

120-154

It should be a general statement

It should be a tentative idea

It should agree with available observations

It should be kept as simple as possible

It should be testable and potentially falsifiable

Question: 121

In which language does the malaria belongs?

Answer: 121

121-154

Malaria belongs to italian words mala mean bad and aria meam air.

Question: 122

What is the causes of malaria?

Answer: 122

122-154

Plasmodium is the cause of malaria

Question: 123

What is Plasmodium?

Answer: 123

123-154

Plasmodium is seen in the blood of malaria patient.

Question: 124

Write down two controls of malria control of Malaria

Answer: 124

124-154

If sleeing places are open then use smoky fire to keep away mosquitoes

Use of wire gauze on windows and doors to keep away mosquitoes to control malaria

Use of mosquito Repellent in the form of lotion on the skin

Question: 125

Define Science?

Answer: 125

125-154

Science is the systemized knowledge derived from observation and experiment.

Question: 126

Difference blw law and theory?

Answer: 126

126-154

Law:If a theory survives such doubtful approach and continues to be supported by experimeutal evidence.It become a law of principle.

Question: 127

What is Biological Method

Answer: 127

127-154

The scientific method in which biological problems are solved is called biological method

Question: 128

Define Nasal Cavity?

Answer: 128

128-154

Nasal cavity is the hallow space in the nose open to the outside through nostrils and divided in to two portions by a wall.

Question: 129

Name the effective medicine?

Answer: 129

129-154

Quinine is an effective medicine.

Question: 130

Define Theory

Answer: 130

130-154

When a hypothesis is given a repeated exposure to experimentation and is not falsified it increases biologists confidence in hypothesis Such well-supported hypothesis may be used as the basis for formulating further hypothesis which are again proved by experimental results The hypothesis that stand the test of time of time are called theories A theory is supported by a great deal of evidence

Question: 131

Define Hypothesis?

Answer: 131

131-154

This tentative explanation of observation is called a hypothesis.

Question: 132

How can we find the forth proportion?

Answer: 132

132-154

a:b = c:d is a proportion between the two ratios.The proportion may also be expressed as a:b::c:d.when three values in a proportion are known the fourth one (X) can be calculated.

Question: 133

Differentiate between Dedication and Theory

Answer: 133

133-154

Deduction: Deductions are the logical consequences of purpose a hypothesis is taken as true and expected results deductions are draw from it and are called deductions General in biological method if a particular hypothesis is true then one should expect certain result This involves the use of if then logic

Question: 134

What is the importance of Data analysis in biological method

Answer: 134

134-154

Data analysis is necessary to prove or disprove a hypothesis by experimentation in biological method It is very important steep as it transforms raw data into information which can be used to summarize and report results. The data organizations and data analysis are important steps in the biological methods date or values made from observations and experiments It is done through the application of statistical method. i.e ratio and proportion

Question: 135

Differentiate between Scientific and Biological method

Answer: 135

135-154

The method which is used by all scientists to solve a problem is called scientific method

Question: 136

In which mosquito plasmodium is found?

Answer: 136

136-154

Mosquitoes transmit plasmodium and so are involved in the spread of malaria.

Question: 137

Define law and principal.

Answer: 137

137-154

If a theory survives such doubtful approach and continues to be supported by experimental evidence.It becomes a law of principal.

Question: 138

What is meant by Productive Theory

Answer: 138

138-154

The theory that keep on suggesting new hypothesis and so testing goes on is called productive theory

Question: 139

Write the role of A.F.A King

Answer: 139

139-154

In 1883 A.F.A king listed 20 observations On the basis of his observations king suggested a hypothesis Mosquitoes transmit plasmodium and so are involved in the spread of Malaria

Question: 140

How Hypothesis is made

Answer: 140

140-154

Biologist organizes his her an others observations into data form and constructs a statement that may prove to be the answer of the biological problem under study This tentative explanation of observations is called a hypotheses

Question: 141

Define Nostrils.

Answer: 141

141-154

The nose encloses the nasal cavity.It opens to the outside through the openings called the nostrils.

Question: 142

Write down the names of steps included in Biological method

Answer: 142

142-154

To solve a problem in biology a biologist takes following steps

Recognition of biological problem

Observations

Hypothesis formulation

Deductions

Experimentation

Summarization of results

Reporting the results

Question: 143

What is meant by Summarization of Results

Answer: 143

143-154

Summarization of Results: Biologist collects the actual and quantitative data from m his experiments

An average data is collected from every experimental group and then statistical comparison is made

For final conclusion biologist also makes statistical analysis

Question: 144

Define Scientific Method

Answer: 144

144-154

The method which is used by all scientists to solve a problem is called scientific method

Question: 145

Differentiate between culex and Aedes moquitoes

Answer: 145

145-154

Culex mosquitoes Culex mosquitoes are responsible for malaria in sparrow

Question: 146

What do you mean by the word malaria

Answer: 146

146-154

The Italian words Mala means bad and aria mean air

Question: 147

Define theory and law

Answer: 147

147-154

Theory: The hypothesis that stand the test of time often tested and never rejected are called theories

Question: 148

Write down importance of saliva for mosquito

Answer: 148

148-154

The saliva of mosquito prevents the blood from clotting in her food canal

Question: 149

Why do we do itching after biting of mosquito

Answer: 149

149-154

When a female mosquito pierces the skin with her mouth parts she injects a small amount of saliva into the wound before drawing blood This kind of saliva is a cause of Itching

Question: 150

What is meant by Deduction

Answer: 150

150-154

Deductions are the logical consequence of hypothesis For this purpose a hypothesis is taken as true and expected results are drawn from it General in biological method if a particular hypothesis is true then one should expect a certain result This involves the use of if then logic

Question: 151

What is meant by Biological Problem

Answer: 151

151-154

A biological problem is a question related to living organisms that is either asked by someone or comes in biologist mind by himself

Question: 152

Write down the important observations of A.F.A King

Answer: 152

152-154

Important observations of A.F.A King: People who slept outdoors were more likely to get malaria than those who slept indoors

People who slept under fine nets were less likely to get malaria than those who did no use such nets

Individuals who slept near a smoky fire usually did not get malaria

Question: 153

How Reporting the Results occurs

Answer: 153

153-154

Biologist publish their findings in scientific journals and books in talks at national and international meetings and in seminars at colleges and universities

Question: 154

Why female mosquito inject saliva in to wound before drawing blood

Answer: 154

154-154

A female mosquito injects injects a small amount of saliva into the would before drawing blood So that the saliva prevents the blood from from clotting in her food canal due to presence of anti coagulant

Biology Chapters

9th Class Chapter 2 Biology Short Questions

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