Chemical control in plants Quiz
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5 questions, one answer each
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1. Which statement about the action of auxin on shoot cells is correct?
- A. It inhibits proton pumps
- B. It makes the wall more acidic, so the wall loosens and the cell elongates
- C. It increases wall rigidity so cells divide
- D. It converts Pr to Pfr
2. Gibberellin stimulates the germination of barley by acting on which tissue?
- A. The embryo, to make starch
- B. The endosperm, to make gibberellin
- C. The aleurone layer, to make amylase
- D. The seed coat, to make auxin
3. A grower pinches out the shoot tips of a plant, producing more branches. What is the best explanation?
- A. Auxin supply falls and cytokinin promotes lateral bud growth
- B. Cytokinin supply falls and auxin promotes lateral buds
- C. Gibberellin is no longer made
- D. Pfr is converted to Pr
4. A short-day plant is grown with a long night interrupted by a brief flash of red light. What happens?
- A. It flowers because Pfr falls
- B. It does not flower because the red flash converts Pr to Pfr
- C. It flowers because the flash converts Pfr to Pr
- D. It does not flower because the dark period was too long
5. Seedlings grown in the dark are long, pale and have unexpanded leaves. This is an example of which process?
- A. Apical dominance
- B. Etiolation, as part of photomorphogenesis
- C. Antagonism between auxin and cytokinin
- D. Starch hydrolysis