Biology 9th Chapter 1 : Topic 9 - Maryam Publications

Biology Chapter 1 : Topic 9

Evaluate the terms 'hypothesis', 'theory' and 'law' in the context of research in the natural sciences.

1 / 10

A scientist suggests that a certain fertilizer increases plant growth. Before testing, this statement is called a:

A) Hypothesis

B) Law

C) Theory

D) Result

2 / 10

Which statement best describes a scientific hypothesis?

A) A collection of experimental results only

B) A testable explanation for an observation

C) A rule that describes a natural phenomenon

D) A proven fact that never changes

3 / 10

After many experiments consistently support a scientific explanation, it may develop into a:

A) Guess

B) Theory

C) Hypothesis

D) Observation

4 / 10

Which of the following best defines a scientific theory?

A) An untested idea

B) A random assumption

C) A scientific law

D) A testable explanation supported by extensive evidence

5 / 10

A scientific law mainly describes:

A) How scientists perform experiments

B) Why a phenomenon occurs

C) What consistently happens in nature

D) An untested prediction

6 / 10

Which statement correctly distinguishes a theory from a law?

A) A theory becomes a law after enough experiments.

B) A theory explains why; a law describes what happens.

C) Both mean exactly the same thing.

D) A law explains why; a theory describes what happens.

7 / 10

A student claims that a scientific theory eventually becomes a law after gaining enough evidence. This statement is:

A) Incorrect

B) Scientifically proven

C) Partly correct

D) Correct

8 / 10

Which sequence best represents the development of scientific knowledge?

A) Law -> Theory -> Hypothesis

B) Hypothesis -> Theory (if strongly supported)

C) Theory -> Hypothesis -> Law

D) Observation -> Law -> Hypothesis

9 / 10

Which of the following is most likely a hypothesis?

A) If plants receive more sunlight, they will grow taller.

B) Gravity causes objects to fall toward Earth.

C) Energy cannot be created or destroyed.

D) Living things are made of cells.

10 / 10

Why are theories and laws important in natural sciences?

A) They prevent new discoveries.

B) They help scientists understand and describe natural phenomena.

C) They are based on opinions rather than evidence.

D) They replace experimentation.

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