Q8 / 180 · AIIMS 2019 (25 May) · Botany

Read the given statements and identify the PGRs $X, Y$ and $Z$. $\mathrm{X}$ induces accumulation of salts inside the cells. Y promotes rapid elongation of leaf bases and internodes in deep water rice plants. (iii) Application of $Z$ to leaves shall reduce transpiration.

  • A
    X-Auxin, Y-Cytokinin, Z-Ethylene
  • Correct answer
    B
    X-Cytokinin, Y-Ethylene, Z-ABA
  • C
    X-Auxin, Y-Cytokinin, Z-ABA
  • D
    X-Cytokinin, Y-ABA, Z-Ethylene

Solution

Cytokinins induce accumulation of salts inside the cells. Ethylene promotes rapid elongation of leaf bases and internodes in deep water rice plants. As a result, leaves remain above water. Application of minute quantity of abscisic acid to leaves shall reduce transpiration to a great extent through partial closure of stomata. It conserves water and reduces the requirement of irrigation.

Hence, the correct answer is option: 'B'.

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