9th Class Biology: chapter 2 Solving a Biological Problem Short Questions Answer

9th Class Biology: chapter 2 Solving a Biological Problem Short Questions Answer

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Write the role of control group in experiments?
In science when doing the experiment it must be a controlled experiment. The scientist must contrast an experimental group with a control group. The two groups are treated exactly alike except for the one variable being tested.
Describe two observations of A.F.A king about malaria?
Some important observations of A.F.A King were: 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 not use such nets.
Describe the meaning of words “mala” and “aria”?
The word Malaria is derived from two greek words. Mala means bad and aria means air i.e disease of bad air.
Why Ronald Ross used sparrow in his experiment?
Scientist used other animals for experiment instead of human beings the reason is that the results of experiments may be hazardous which can harm them.
Why quantitative observations are better in biological method?
Quantitative observations are better in biological method because the former are invariable and measurable and can be recorded in terms of numbers.
Give two examples of qualitative observations?
The freezing point of water is colder than the boiling point. On liter of water in heavier than one liter of ethanol.
What is meant by biological problem?
A query about lie that is either asked by some one or comes in biologist’s mind by himself is called biological problem.
What is the relation of quina with cinchona?
When the new world was discovered 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 impossible to carry enough bark to Europe. Some dishonest merchants began to substitute the bark of another tree, the cinchona which closely resembled quina-quina. This dishonesty proved much valuable for mankind. The cinchona bark was found to be excellent for trating malaria as itcontains quinine that effective in treating the disease.
How a hypothesis formulate?
Biologist organizes 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 the observations is called a hypothesis it may be defined as proposition that might be true.
Defice Biological Method?
The scientific method in which biological problems are solved is termed biological method.
Write two examples of Biological Laws?
Hardy wein Berg law, and Medel law are examples of biological laws.
Differentiate between qualitative and quantitative observations?
Qualitative observations are those which are variable and are not measurable. These are recorded in terms of conditions for example one liter of water is heavier then one liter of ethanol while quantitative observations are invariable and measurable and can be recorded in terms of numbers.
Define law or principle?
If a theory survives such doubtful approach and continues to be supported by experimental evidence in becomes law. A scientific law is a uniform or constant fact of nature. It is an irrefutable theory.
What is meant by bioinformatics?
Bioinformatics refers the computational and statistical techniques for the analysis of biological data.
Define Scientific Method?
As the science is an organized knowledge obtained from different observations and experiments carried out to determine the principles about how the nature works chemists biologists ecologists and physicist all use the scientific method make and test new theories.
What is menant by productive theory?
A theory is supported by a great deal of evidence. Productive theory keeps on suggesting new hypothesis and so testing goes on many biologist take it as challenge and exert greater efforts to disprove the theory.
Write down the contributions of French Army Physician Laveran?
In 1878 a French army physicians Laveran began to search for the cause of malaria. He took a small amount of blood from a malarial patient and examined it under microscope. He noticed first about some tiny living creatures in blood of patients.
What is difference between theory and Law?
Theory: The hypothesis that often tested and never rejected is called theory. A theory is supported by a great deal of evidence. Law: Law is a rule which predicts the sme result when similar conditions are always satisfied.
Give two examples of quantitative observation?
Examples of quantities observations are: The freezing point of water is 0˚C and the boiling point is 100˚C.
What is meant by hypothesis?
The tentative explanation of observation is called hypothesis.
Define Ratio and Proportion?
When a relation between two numbers e.g. ‘a’ and ‘b’ is expressed in terms of quotient (a/b) it is called ratio. It may be represent by the sign of equality(=) e.g. a:b =c:d.
What is incubation Period?
Tha gap between a parasite on entering in a host and appearance of symptoms of diseases is known as incubation period.
How the reporting of results is done?
Biologist publish their findings in scientific journals and books in talks at national and international meetings and in seminars at colleges and universities. Publishing of results is an essential part of the scientific method. It allows other people to verify the results or appl the knowledge to solve other problems.
How deductions are formed?
The logical consequences of hypothesis is called deduction. The deduction involve the use of if-then logic.
Give an example of qualitative observations and quantitative observations?
Example of Qualitative observations: The freezing point of water is colder than the boiling point is an example of qualitative observation. Example of quantitative observations: 1 Liter of water weighs 1000 gram and a liter of ethanol weighs 789 grams.
What was the name of first medicine for malaria curing?
In first quina-quina medicine is used to cure malaria.
Write four characteristics of a good hypothesis?
A good hypothesis should have the following characteristics. It should be a general statement. It should be a tentative idea. It should agree with available observatitons. It should be kept as simple as possible.
Write down names of different steps. Involved in solving biological problem?
In solving a biological problem biological takes following steps: Recognition of biological problem. Observations. Hypothesis formulation. Deductions. Experimentation. Summarization of results. Reporting the results.
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