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CAIE A-Level Biology A2 15.2.1 Venus Fly Trap Rapid Response Questions

Explain the rapid response of the Venus fly trap using evidence from each question and mark scheme.

Syllabus
2028–2030
Course
Biology 9700
Level
A2

Exam points

  • Explain the rapid response of the Venus fly trap.

CAIE A-Level Biology A2 15.2.1 Venus Fly Trap Rapid Response Questions question 1

[Maximum number: 2]

Question (a)

(a)

The Venus fly trap is a plant that is able to capture and digest insects. It has modified leaves, which have sensory hairs that respond to touch. When an insect comes into contact with the hairs, receptor potentials are generated.

[ 2 ]

Question (i)

(i)

Name the ion that moves into the cells at the base of the sensory hairs to generate receptor potentials.

[ 1 ]

Question (ii)

(ii)

If two or more of these hairs are stimulated within a period of 20-35 seconds, action potentials are generated, causing the leaf to close quickly and trap the insect.

Suggest why it is beneficial to the plant for stimulation of two or more hairs to be necessary before the leaf will close.

[ 1 ]
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