Everyday Science · Botany (Plant Biology) · page 26 of 26

Plant Structure MCQs with Answers

Includes 12 past paper MCQs (marked).

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Plant Structure & Reproduction MCQs (251–254)

4 MCQs with answers and a short one-liner. Hide answers to test yourself.

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251.
Past Paper MCQ
The most important stimulus for tea leaves is _?
Correct Answer: A. Caffeine
One-liner
The most important stimulus in tea leaves is caffeine, which acts as a natural stimulant and is responsible for tea's alertness-inducing effects.
252.
Phytoalexins are like antifungal or fungistatic substances produced by the host as defensive measure after infection and are generally ?
Correct Answer: C. Phenolic compounds
One-liner
Phytoalexins are generally phenolic compounds produced by plants as a defense mechanism against fungal infections.
253.
The International Association of Botanic Gardens was formed in as a worldwide organization affiliated to the International Union of Biological Sciences.
Correct Answer: D. 1954
One-liner
The International Association of Botanic Gardens (IABG) was formed in 1954 as a worldwide organization affiliated to the International Union of Biological Sciences (IUBS).
254.
Which vitamin's gene is inserted in the rice plant to create a genetically modified rice variety?
Correct Answer: C. Vitamin A
One-liner
The gene for Vitamin A (beta-carotene biosynthesis) is inserted into rice to create Golden Rice, a genetically modified variety.