Far-red light promotes flowering in_______________?
Correct answer: A. Short day plant
- A. Short day plant
- B. Long day plant
- C. Day neutral plant
- D. None of these
Explanation
Far-red light converts the active Pfr form of phytochrome into the Pr form, which favours flowering in short-day plants by making the plant respond as though the uninterrupted night is longer. In long-day plants, red light generally promotes the flowering response by producing more Pfr. The common mistake is choosing long-day plant because far-red light is linked with changes in day length, without considering the phytochrome response.
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Animal and plant cells share a plasma membrane, cytoplasm, nucleus, ribosomes, mitochondria and endoplasmic reticulum, but plant cells also have a cellulose cell wall, chloroplasts and a large permanent vacuole. Questions cover organelle structure and function, differences between the two cell types, and how membranes control movement of substances.
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