Plant Hormones MCQs Part 4

1. The Greek root words meaning "plant" and "color" are the basis for the term

• auxin
• tropism
• nastic
• phytochrome

2. How do some plants seeds "know" when it is day and night, and perhaps when to germinate?

• They chemically count the circadian cycles
• All plant hormones are products of photosynthetic systems
• Photosynthetic rates provide direct evidence of sun-produced food
• Phytochromes cycle between red and far-red absorption and light levels can inhibit germination

3. Gravitropism in roots

• is positive when plant roots grow downward
• is due to statoliths in the root cap cells
• is due to amyloplasts
• All of the choices are true

4. Apical dominance in plants is due to which of the following plant hormones?

• ethylene
• gibberellin
• auxins
• cytokinins

5. Which of the following is/are true regarding gibberellins?

• there are about 70 chemically different gibberellins
• are growth promoters causing stem elongation
• these hormones can break seed and bud dormancy
• all of the choices are true

6. Cytokinins

• are plant hormones that promote cell division
• are used in combination with auxin to produce plants from undifferentiated callose tissue
• also work with oligosaccharins to effect tissue differentiation
• All of these are true regarding cytokinins

7. which of the plant hormones ripens fruit and control abscission

• Auxin
• Gibberellin
• Abscisic acid
• Ethylene

8. Hormone which induces amylase production in seeds

• Auxin
• Gibberellin
• Abscisic acid
• Ethylene

9. Hormone which affects stomatal response to water stress

• Auxin
• Gibberellin
• Abscisic acid
• Ethylene

10. Hormone which promotes cell division

• Gibberellin
• Abscisic acid
• Ethylene
• Cytokinin

Score =

Correct answers:

Plant Hormones MCQs Parts => 1.. 2.. 3.. 4..

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