CBSE Class 11 Biology Plant Growth And Development Worksheet Set D

PLANT GROWTH AND DEVELOPMENT

1. Write the full form of IAA, IBA, NAA.

2. What is apical dominance?

3. Name the plant hormone that can delay senescence.

4. What is growth curve?

5. Distinguish between differentiation and dedifferentiation.

6. A gardener finds some broad-leaved dicot weeds growing in his lawns. What can be done toget rid of the weeks efficiently?

7. List the uses of Auxin.

8. Briefly describe

a) Plasticity b) Abscission

9. The role of ethylene and abscissic acid is both positive and negative. Justify the statement.

10. Identify the gaseous plant hormone. Describe its actions in plants.

11.Define parthenocarpy. Name the plant hormone used to induce parthenocarpy.

12. What would be expected to happen if:

a) GA3 is applied to rice seedlings.

b) Dividing cells stop differentiating

c) A rotten fruit gets mixed with unripe fruits.

d) You forgot to add cytokinin to the culture medium

e) Induce immediate stomatal closure in leaves

13 Which one of the plant growth regulators would you use if you are asked to:

a) Induce rooting in a twig

b) Quickly ripen a fruit

c) Delay leaf senescence5

d) Induce growth in axillary buds

e) Bold a rosette plant

14 a) Abscisic acid is also known as stress hormone. Why?

b) What do you understand by Photoperiodism and Vernalisation? Describe their significance.

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