Page 3 - Assignment-Questions-Plant growth and Development

C. Short Answer Questions-II (2 marks each)

9. How will you induce lateral branching in a plant which normally does not produce
them ? Give reason.
10. What induces ethylene formation in plants? Give any two different action of ethylene
on plants.
11. What is meant by abscission ? Name the phytohormone involved in it.
12. What is meant by apical dominance ? Which hormone control it?
13. Differentiate between photoperiodism and vernalisation.

D. Short Answer Questions-I (3 marks each)

14. What would be expected to happen if :
(a) GA3 is applied to rice seedling.
(b) a rotten fruit get mixed with unripe fruits.
(c) you forget to add cytokinin to the culture medium.
15. Which growth hormone is responsible for the following :
(a) induce rooting in a twig

(b) quick ripening of a fruit
(c) delay leaf senescence
(d) ‘bolt’ a rosette plant
(e) induce immediate stomatal closure in leaves (f) Induce growth in axillary buds
16. Define differentiation, dedifferentiation and redifferentiation.
17. Where are auxins generally produced in a plant ? Name any one naturally
occuring plant auxin and any one synthetic auxin.
18. Define growth rate. Name two types of growth. Give the shape of curve for these
growths.
19. Mention various parameters taken into consideration for measuring the growth.

E. Long Answer Questions (5 marks each)

. 20. Enlist the five categories of phytohormone. Write atleast two uses of each.