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) Theory

C) Law

D) Result

2 / 10

Which statement best describes a scientific hypothesis?

A) A testable explanation for an observation

B) A rule that describes a natural phenomenon

C) A collection of experimental results only

D) A proven fact that never changes

3 / 10

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

A) Hypothesis

B) Guess

C) Theory

D) Observation

4 / 10

Which of the following best defines a scientific theory?

A) A scientific law

B) A random assumption

C) An untested idea

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) Both mean exactly the same thing.

B) A theory becomes a law after enough experiments.

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

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) Scientifically proven

B) Correct

C) Incorrect

D) Partly correct

8 / 10

Which sequence best represents the development of scientific knowledge?

A) Law -> Theory -> Hypothesis

B) Observation -> Law -> Hypothesis

C) Theory -> Hypothesis -> Law

D) Hypothesis -> Theory (if strongly supported)

9 / 10

Which of the following is most likely a hypothesis?

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

B) Energy cannot be created or destroyed.

C) Gravity causes objects to fall toward Earth.

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 are based on opinions rather than evidence.

C) They help scientists understand and describe natural phenomena.

D) They replace experimentation.

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