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Plant and animal responses

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Question 12

A seedling is placed horizontally in a dark chamber as shown in the diagram below. Gravity acts in the direction of the arrow.

Seedling Gravitropism

Which of the following statements correctly explains the distribution of indoleacetic acid (IAA) and its subsequent effect on the growth of the seedling?

IAA accumulates on the lower side of the shoot (XXX) stimulating cell elongation, and on the upper side of the root (YYY) inhibiting cell elongation.

IAA accumulates on the lower side of the shoot (XXX) stimulating cell elongation, and on the lower side of the root (ZZZ) inhibiting cell elongation.

IAA accumulates on the upper side of the shoot (WWW) inhibiting cell elongation, and on the lower side of the root (ZZZ) stimulating cell elongation.

IAA accumulates on the lower side of the shoot (XXX) inhibiting cell elongation, and on the lower side of the root (ZZZ) stimulating cell elongation.

Plant and animal responses Questions

  1. A Level
  2. /Biology
  3. /Plant and animal responses