Waec Model Questions Vol1 2023 Biology Question 12

Practice objective / multiple choice question 12 from the 2023 Waec Model Questions Vol1 Biology examination.

Waec Model Questions Vol1 2023 Biology Objective / Multiple Choice Medium Difficulty
Question 12 WAEC_MODEL_QUESTIONS_VOL1 • 2023 • BIOLOGY • objective

In a plant, hormone X is synthesised in leaves when temperature falls below 10 °C. X is transported through the phloem to the shoot apical meristem where it suppresses the expression of gene Y. Gene Y normally activates the production of hormone Z, which promotes stem elongation. In a mutant plant the transport of hormone X is blocked, but the enzymatic steps that produce hormone Z remain functional. Under low‑temperature conditions, compare the expected stem elongation of the mutant with that of a wild‑type plant and explain the reasoning.

Answer Options

Correct Answer A. The mutant will exhibit relatively normal (or increased) stem elongation, whereas the wild‑type plant shows reduced elongation under low temperature.
B. Both the mutant and the wild‑type plant show severely reduced stem elongation under low temperature.
C. The mutant shows no stem elongation, whereas the wild‑type plant displays increased elongation under low temperature.
D. The mutant will exhibit reduced stem elongation, while the wild‑type plant maintains normal elongation under low temperature.
Correct Answer
A
Correct Option:
The mutant will exhibit relatively normal (or increased) stem elongation, whereas the wild‑type plant shows reduced elongation under low temperature.

About This Question

This is Waec Model Questions Vol1 2023 Biology Question 12. It is one of the objective questions from the 2023 Waec Model Questions Vol1 Biology examination.

Difficulty level: Medium .

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