Tutopiya: Study Resources for IGCSE, IB, GCSE & A-Levels

Practice progress

5 MCQs

0 of 5 attempted

Correct

Incorrect

Remaining

1
Where is auxin produced in a plant?
Answer & explanation
Correct: option B
Auxin is produced at the actively growing tips of shoots and roots (meristem regions).
2
Which describes phototropism in a shoot?
Answer & explanation
Correct: option B
Shoots are positively phototropic — they grow towards light to maximise photosynthesis.
3
In a shoot exposed to light from one side, where does auxin accumulate?
Answer & explanation
Correct: option B
Auxin moves to the shaded side, where it makes cells elongate more, bending the shoot towards the light.
4
What is the effect of auxin in roots?
Answer & explanation
Correct: option B
In roots, auxin INHIBITS elongation — the opposite of its effect in shoots.
5
Which plant hormone is mainly responsible for ripening fruit?
Answer & explanation
Correct: option C
Ethene (ethylene) is a plant hormone gas that ripens fruit.