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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. 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.

2. How many pairs of cranial nerves are present in the human peripheral nervous system?

  1. 31 pairs
  2. 12 pairs
  3. 24 pairs
  4. 10 pairs
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Answer: B

The human peripheral nervous system contains 12 pairs of cranial nerves and 31 pairs of spinal nerves.

3. Stereophonic hearing allows an animal to determine:

  1. The frequency of light waves
  2. The chemical composition of air
  3. The exact location and direction of a sound source
  4. The speed of underwater currents
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Answer: C

Stereophonic hearing uses both ears to detect differences in sound arrival time and intensity to locate the sound source.

4. How does nastic movement differ from tropism in plants?

  1. Nastic movement depends on the direction of the stimulus, tropism does not
  2. Nastic movement is always a permanent growth response
  3. Nastic movement does not depend on the direction of the stimulus
  4. Tropisms occur rapidly, whereas nastic movements take months
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Answer: C

Nastic movements are rapid, non-growth responses independent of the direction of the external stimulus.

5. 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.

6. Which visual characteristic is typical of monocular vision in animals?

  1. A narrow field of vision with high 3D depth perception
  2. A wide field of vision with minimal overlap between two eyes
  3. Both eyes located at the front of the skull
  4. Ability to estimate distance accurately when catching prey
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Answer: B

Monocular vision features eyes on opposite sides of the head, offering a broad field of view to spot incoming predators.

7. Which specialized sensory structure allows fish to detect pressure changes and water movement around them?

  1. Lateral line system
  2. Jacobson's organ
  3. Ampullae of Lorenzini
  4. Olfactory bulb
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Answer: A

The lateral line system running along the sides of a fish contains sensory cells that detect water vibrations and pressure changes.

8. 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.

9. How do bats navigate and hunt effectively in complete darkness?

  1. By sensing electric fields emitted by prey
  2. By producing ultrasound waves for echolocation
  3. By utilizing lateral line pressure organs
  4. By relying on sensitive infrared heat receptors
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Answer: B

Bats emit ultrasound pulses that bounce off obstacles and prey, using echolocation to create a mental spatial map.

10. A person cannot see distant objects clearly because light rays focus in front of the retina. What defect do they have and how is it corrected?

  1. Astigmatism; corrected with cylindrical lens
  2. Hyperopia; corrected with convex lens
  3. Myopia; corrected with concave lens
  4. Presbyopia; corrected with bifocal lens
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Answer: C

Short-sightedness (myopia) causes distant light rays to focus in front of the retina. It is corrected using concave lenses to diverge light rays.

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