GROWTH AND DEVELOPMENT OF THE FLOWERING PLANTS

GROWTH AND DEVELOPMENT
OF FLOWERING PLANTS

1. True growth is considered to represent

a. Gain in inorganic matter b. Gain in organic matter c. Gain in wall material

d. a and c are correct

2. The rate of respiration of cells in formative phase is

a. Higher b. Lower c. Phase of differentiating cells d. Equal to elongating cells

3. Cell enlargement is due to

a. florigen b. traumatin c. gibberellin d. auxin

4. Maximum growth in root occurs

a. at its apex b. in the root hair zone c. Behind the apex

d. In the presence of soil

5. Maximum growth for shoots has been observed in

a. Asparagus officinalis b. Dendrocalamus giganteous c. Dictyophora phalloidea

d. Mangifera indica

6.Leaf fal occurs when content of

a. Abscisic acid decreases b. Auxin decreases c. Auxin increases

d. Gibberellin decreases

7. The universal natural auxin of plants is

a. IBA b. IAA c. NAA d. Citric auxin

8. Pathenocarpy can be achieved by

a. Zeatin b. ABA c. Auxins d. Kinetin

9. Movement of auxin is largely

a. Acropetal b. Basipetal c. Both a and b d. Centripetal

10. The hormone responsible for apical dominance is

a.IAA b. GA c. ABA d. Florigen

11. If a growing plant is decapitate then

a. Axillary buds are inactivated b. Axillary buds are activated

c. Leaves become yellow and fall off d. Growth stops

12. IAA Prercursor is

a. Tryptophan b. Leucine c. Tyrosine d. Phenylaline

13. Mowing grass lawn facilitates better maintenance because

a. Wounding stimulates regeneration

b. Removal of apical dominance and stimulation of intercalary meristem

c. Removal of apical dominance and promotion of lateral meristem

d. Of removal of apical dominance

14. Which of the following is used in root formation on stem cuttings?

a. Kinetin b. GA c. ABA d. IBA

15. Apical dominance is caused by

a. Abscisic acid in lateral bud b. Cytokinin in leaf tip c. Gibberellin in lateral buds

d.Auxin in shoot tip

16. The phenomenon of apical dominance can be overcome by exogenous application of

a. auxins b. gibberellins c. cytokinins d. ethylene

17. Which increases in the absence of light?

a. Uptake of minerals b. Uptake of water c. Elongation of internodes

d. Ascent of sap

18. Herbicides are chemicals which control

a. Insects b. Fungi c. Weeds d. Nematodes

19. Highest auxin concentration occurs

a. In growing tips b. In leaves c. At base of plant organs d. In xylem and phloem

20. IAA was first isolated from

a. Corn germ oil b. Gibberella c. Human urine d. Rhizopus

21. Dwarfness can be controlled by treating plants with

a. Cytokinin b. Gibberellic acid c. Auxin d. Antigibberellin

22. Cytokinins

a. Promot abscission b. Influence water movement

c. Inhibit protoplasmic streaming d. Help retain chlorophyll

23. Hormone primarily connected with cell division is

a. IAA b. NAA c. Cytokinin zeatin d. Gibberellic acid

24. Cut or excised leaves remain green for long if induced to root or dipped in

a. Gibberellins b. Cytokinins c. Auxins d. Ethylene

25. The regulator which retards ageing of plant parts is

a. Cytokinin b. Auxin c. Gibberellin d. Abscisic acid


ANSWERS

1. b 2. a 3. d 4.c 5. b 6. b 7. b 8. c 9. b 10. a

11. b 12. a 13. b 14. d 15. d 16. c 17. c 18. c 19. a 20. c

21. b 22. d 23. c 24. b 25. a