UHA Biology Notes 9th Class
Chapter-2
Important short Question:
Ans:
Observations may be qualitative and quantitative.
2. Define observation.
Ans:
Opinion which is made with the help of five senses of
vision, hearing, smell, taste and touch is called observation.
3. Which steps are taken by biologists to solve a biological
problem?
Ans:
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
4. Write the deduction process.
Ans:
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.
5. Define biological problem.
Ans:
A biological problem is a question related to living
organisms that is either asked by someone or comes in biologist's mind by
himself.
6. Different between theory and law.
Ans:
Theory:
The hypotheses that stand the test of time are called
theories.
Example:
Cell theory
7. Give two example of qualitative and two of quantitative
observations.
Ans:
Qualitative observations:
The freezing point of water is colder than the boiling point. A liter of
water is heavier the liter of ethanol.
8. What is the importance of biological method?
Ans:
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.
9. What is scientific method?
Ans:
The scientific method, in which biological problems are
solved, is termed as biological method.
Example: Study of Malaria.
10. Define hypothesis.
Ans:
The tentative explanation of the observations is called
hypothesis.
11. What is the cause of malaria?
Ans:
A tiny creature, plasmodium is the cause of malaria.
12. What is quinine?
Ans:
The substance extracted from cinchona bark to treat malaria
is called quinine.
13. What is cinchona?
Ans:
Cinchona is a tree, the bark of which was found to be
excellent remedy for treating malaria.
14: Name any one biological problem.
Ans:
Malaria is a biological problem.
15. What is meaning of malaria?
Ans:
The Italian words "mala" means bad and
"aria" means air.
Ans:
Variable is a factor being tested in and experiment and is
usually compared to a control group.
17. What is the importance of Data analysis in biological method?
Ans:
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.
18. Define Law of principle.
Ans:
law or Principle:
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.
19. Define theory.
Ans:
The hypotheses that stand the test of time are called
theories. A theory is supported by a great deal of evidence.
Example: Theory of evolution.
20. Define Ratio and Proportion.
Ans:
Ratio:
When the relation between 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.
21. Define culex.
Ans:
Culex is a kind of mosquito, female of which spreads malaria
in sparrows.
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