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O Level Biology: Coordination and Response in Plants MCQs — Biology

10 multiple-choice questions on O Level Biology: Coordination and Response in Plants from Biology, each with the correct answer and, where available, a teacher's explanation. Read through them to revise the chapter, then practise the same questions one by one to test yourself.

1. When light shines on a shoot from one side, auxin

  1. moves to the lit side and stops growth
  2. moves to the shaded side, causing cells there to elongate more
  3. moves to the roots
  4. is destroyed completely

Answer: B) moves to the shaded side, causing cells there to elongate more

Explanation: Unequal auxin causes bending towards light. O Level Biology · Topic 15 Coordination and Response in Plants · 15.1 Coordination and response in plants

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2. Roots grow towards gravity. This is

  1. negative gravitropism
  2. negative phototropism
  3. positive phototropism
  4. positive gravitropism

Answer: D) positive gravitropism

Explanation: Roots grow down with gravity. O Level Biology · Topic 15 Coordination and Response in Plants · 15.1 Coordination and response in plants

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3. A seedling is placed on its side in the dark. The shoot bends upwards because

  1. auxin collects on the upper side
  2. auxin collects on the lower side and that side grows more
  3. light is coming from above
  4. gravity pulls the shoot up

Answer: B) auxin collects on the lower side and that side grows more

Explanation: Lower side elongates more. O Level Biology · Topic 15 Coordination and Response in Plants · 15.1 Coordination and response in plants

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4. The tip of a shoot is covered with foil and lit from one side. The shoot

  1. grows straight up
  2. bends away from the light
  3. stops growing
  4. bends towards the light

Answer: A) grows straight up

Explanation: The tip detects light; covered tip means no bending. O Level Biology · Topic 15 Coordination and Response in Plants · 15.1 Coordination and response in plants

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5. Shoots growing towards light show

  1. translocation
  2. positive phototropism
  3. negative phototropism
  4. positive gravitropism

Answer: B) positive phototropism

Explanation: Shoots bend towards light. O Level Biology · Topic 15 Coordination and Response in Plants · 15.1 Coordination and response in plants

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6. How does phototropism help a plant?

  1. Leaves get more light for photosynthesis
  2. Roots find water
  3. Seeds are dispersed
  4. Flowers attract insects

Answer: A) Leaves get more light for photosynthesis

Explanation: Bending towards light increases photosynthesis. O Level Biology · Topic 15 Coordination and Response in Plants · 15.1 Coordination and response in plants

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7. A clinostat is used in tropism experiments to

  1. add auxin
  2. provide extra light
  3. measure growth
  4. remove the effect of one-sided light or gravity

Answer: D) remove the effect of one-sided light or gravity

Explanation: Slow rotation acts as a control. O Level Biology · Topic 15 Coordination and Response in Plants · 15.1 Coordination and response in plants

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8. Auxin stimulates

  1. cell death
  2. photosynthesis
  3. cell elongation
  4. transpiration

Answer: C) cell elongation

Explanation: Auxin makes shoot cells longer. O Level Biology · Topic 15 Coordination and Response in Plants · 15.1 Coordination and response in plants

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9. Growth of a plant towards or away from gravity is called

  1. phototropism
  2. transpiration
  3. germination
  4. gravitropism

Answer: D) gravitropism

Explanation: Gravitropism is the response to gravity. O Level Biology · Topic 15 Coordination and Response in Plants · 15.1 Coordination and response in plants

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10. Where is auxin made?

  1. In the roots only
  2. In the shoot tip
  3. In the flowers
  4. In the leaves only

Answer: B) In the shoot tip

Explanation: Auxin is made in the shoot tip. O Level Biology · Topic 15 Coordination and Response in Plants · 15.1 Coordination and response in plants

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