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Quiz Chapter 1: Stimuli and Responses

10 questions · Form 3 Science Bab 1: Stimuli and Responses

10 questions · plays in fullscreen

Full Question List & Answer Key

Prefer reading to quizzing? All 10 questions are listed below with the answer and explanation under each one.

1. Which component forms part of the central nervous system in humans?

  1. Spinal nerves
  2. Cranial nerves
  3. Spinal cord
  4. Sensory receptors
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Answer: C

The central nervous system consists of the brain and the spinal cord.

2. What is the correct pathway for a voluntary action?

  1. Receptor -> Sensory nerve -> Brain -> Motor nerve -> Effector
  2. Receptor -> Motor nerve -> Brain -> Sensory nerve -> Effector
  3. Stimulus -> Motor nerve -> Spinal cord -> Sensory nerve -> Response
  4. Receptor -> Spinal cord -> Effector -> Motor nerve
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Answer: A

Voluntary actions follow the pathway: Stimulus -> Receptor -> Sensory nerve -> Brain -> Motor nerve -> Effector -> Response.

3. Which organism relies on thigmotropism to climb structures for sunlight exposure?

  1. Maize plant roots
  2. Cucumber vine tendrils
  3. Mimosa pudica leaves
  4. Venus flytrap lobes
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Answer: B

Cucumber vines use tendrils that cling and wrap around supports upon contact (thigmotropism).

4. Which basic taste detected by the human tongue corresponds to savory flavors rich in glutamates?

  1. Salty
  2. Bitter
  3. Sour
  4. Umami
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Answer: D

Umami is the fifth basic taste, classified as a savory taste found in meat, cheese, and monosodium glutamate (MSG).

5. Plant shoots grow upwards away from the gravitational pull of the Earth. This growth response is:

  1. Positive geotropism
  2. Negative geotropism
  3. Positive phototropism
  4. Negative hydrotropism
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Answer: B

Shoots growing upward away from gravity display negative geotropism.

6. Which photoreceptor cells in the human retina are responsible for color vision in bright light?

  1. Rod cells
  2. Cone cells
  3. Olfactory cells
  4. Ciliary cells
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Answer: B

Cone cells are sensitive to color (red, green, blue) in bright light, whereas rod cells detect light intensity in dim light.

7. Which structure in the brain controls involuntary actions like breathing and heartbeat?

  1. Cerebrum
  2. Cerebellum
  3. Medulla oblongata
  4. Hypothalamus
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Answer: C

Involuntary actions such as heartbeats, peristalsis, and breathing are controlled automatically by the medulla oblongata.

8. What type of lens is used to correct astigmatism?

  1. Biconcave lens
  2. Cylindrical lens
  3. Convex lens
  4. Planoconvex lens
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Answer: B

Astigmatism is caused by irregular curvature of the cornea or lens and is corrected using cylindrical lenses.

9. The response of plant roots growing towards water is known as positive:

  1. Geotropism
  2. Phototropism
  3. Hydrotropism
  4. Thigmotropism
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Answer: C

Growth towards water is positive hydrotropism, helping roots absorb water and minerals from soil.

10. Why does a blind spot exist on the retina of the eye?

  1. It is covered by a thick layer of mucus
  2. It contains only rod cells and no cone cells
  3. The optic nerve leaves the eye, so no photoreceptors are present there
  4. Light cannot pass through the lens at that specific angle
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Answer: C

The blind spot is the point where the optic nerve exits the eyeball; it completely lacks light-sensitive photoreceptor cells.

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