Page 2 - Assignment-Questions-Plant growth and Development

7. Tendrils of garden peas coiling around any support signifies:

1. Seismonasty
2. Thigmotaxis
3. Gravitropism
4. Thigmotrophism

8. ____________ tissues synthesize natural cytokinins

1. Old
2. Rapidly dividing
3. Storage
4. None of the above

9. ________ is a plant hormone generally present in the gaseous state

1. Ethylene
2. Ethane
3. Argon
4. None of the above

10. _________ is a colourless gas that serves as a signalling hormone.

1. Benzene
2. Nitric Oxide
3. Ozone
4. None of the above

B. Very Short Answer Questions (1 mark each)

1. Write the cause of 'Bakane' disease of rice.
2. Name the plant hormone which was first isolated from human urine.
3. Name the only gaseous plant hormone.
4. How does abscisic acid acts as stress hormone in drought condition?
5. A farmer observed some broad-leaved weeds in a wheat crop farm. Which plant
hormone would you suggest remove them?
6. Why do lateral buds start developing into branches when apical bud is removed?
7. Flowering in certain plant occur only when they are exposed to low temperature for a
few weeks. Name this phenomenon.
8. Name the hormone released from over-ripe apples that affects all other apples in a
small wooden box.