Plant Growth and Development (Multiple Choice Question and Answers)

Plant Growth and Development

Multiple Choice Question and Answers

1. The growth involves

(a) cell division

(b) cell elongation

(c) cell maturation

(d) all of the above

Answer: (d) all of the above

2. The substances which originates at the tip of stem and control the growth elsewhere are

(a) vitamins

(b) auxins

(c) enzymes

(d) florigen

Answer: (b) auxins

3. Who demonstrated that cut tip of canary grass seedling resumes phototropic sensitiveness when pasted back in its position?

(a) Darwin

(b) Palpitations

(c) Boysen-Jensen

(d) Went

Answer: (a) Darwin

4. Auxanometer is used for the measurement of

(a) auxins

(b) growth

(c) movement

(d) respiration

Answer: (b) growth

5. Gibberellins were first discovered from

(a) algae

(b) fungi

(c) angiosperms

(d) bacteria

Answer: (b) fungi

6. Dwarf plants can be made taller by

(a) gibberellins

(b) auxin

(c) cytokinin

(d) vernalin

Answer: (a) gibberellins

7. High concentration of synthetic auxins would

(a) kill the plants

(b) prevent lateral buds from growing

(c) control cell division

(d) cause phototropism

Answer: (a) kill the plants

8. Which one of the following is known to induce flowering in pineapple?

(a) Ethylene

(b) ABA

(c) Gibberellins

(d) Cytokinins

Answer: (a) Ethylene

9. Which of the following is not a naturally occurring hormone?

(a) 2 4-D

(b) GA3

(c) Zeatin

(d) IAA

Answer: (a) 2 4-D

10. The following is a growth inhibitor

(a) IAA

(b) ABA

(c) NAA

(d) GA3

Answer: (b) ABA

11. The auxins are abundantly produced in

(a) shoot

(b) root

(c) meristematic region of the shoot

(d) meristematic region of the root

Answer: (c) meristematic region of the shoot

12. Which of the following plant hormone substitutes for low temperature treatment?

(a) auxin

(b) gibberellins

(c) cytokinin

(d) none of the above

Answer: (b) gibberellins

13. 2-4-dichlorophenoxyacetic acid is generally used as

(a) fungicide

(b) weedicide

(c) pesticides

(d) growth inhibitor

Answer: (b) weedicide

14. Garner and Allard are related with

(a) photophosphorylation

(b) photoperiodism

(c) phototropism

(d) photolysis

Answer: (b) photoperiodism

15. Which of the following hormones is known to promote maleness in flowering plants?

(a) gibberellic acid

(b) Kinetin

(c) IAA

(d) 2,4 D

Answer: (a) gibberellic acid

16. Cytokinin

(a) is a hormone whose main function is to induce the cell division

(b) is the process of cell division

(c) refers to cell division

(d) causes dormancy

Answer: (a) is a hormone whose main function is to induce the cell division

17. The coleoptile in grass seedling is

(a) radical

(b) plumule

(c) cotyledon

(d) sheath around emerging leaf

Answer: (d) sheath around emerging leaf

18. Abscisic acid controls

(a) shoot elongation

(b) cell elongation and cell wall formation

(c) cell division

(d) leaf fall and dormancy

Answer: (d) leaf fall and dormancy

19. Highest concentration of auxin exists

(a) at the base of various plant organs

(b) in growing tips of plants

(c) in leaves

(d) in xylem and phloem cells only

Answer: (b) in growing tips of plants

20. An excised leaf does not turn yellow if it is induced to root. This is attributed to the synthesis in the root of

(a) ethylene

(b) cytokinins

(c) gibberellins

(d) auxins

Answer: (b) cytokinins

21. The ripening of fruit can be hastened by treatment with

(a) gibberellic acid

(b) indole acetic acid

(c) florigen

(d) ethylene gas

Answer: (d) ethylene gas

22. Indole 3 Acetic Acid, called auxin was first isolated from

(a) human urine

(b) corn germ oil

(c) fusarium

(d) rhizopus

Answer: (a) human urine

23. Primary precursor of IAA is

(a) phenylalanine

(b) tyrosine

(c) tryptophan

(d) lucine

Answer: (c) tryptophan

24. In higher plants the reason for effective apical growth

(a) photoperiodism

(b) enzyme

(c) hormones

(d) requirement of light

Answer: (c) hormones

25. The growth regulator that retards ageing of plant organ is

(a) auxin

(b) gibberellins

(c) cytokinin

(d) abscisic acid

Answer: (c) cytokinin

26. In plants auxin synthesis occurs in

(a) cortex

(b) phloem cells

(c) root and shoot tips

(d) xylem cells

Answer: (c) root and shoot tips

27. Apical dominance is caused by

(a) auxin

(b) gibberellins

(c) Kinetin

(d) ABA

Answer: (a) auxin

28. Hormone used in early ripening of fruit is

(a) auxin

(b) ABA

(c) ethylene gas

(d) cytokinin

Answer: (c) ethylene gas

29. Induction of cell division and delay in senescence is due to

(a) cytokinin

(b) Kinetin

(c) gibberellins

(d) auxin

Answer: (a) cytokinin

30. Which of the following is the effect of 2,4 di chlorophenoxy acetic acid?

(a) increase of branches

(b) increase in the growth of all parts

(c) delay in senescence

(d) bolting

Answer: (b) increase in the growth of all parts

31. Which of the following inhibits the growth of lateral axillary buds?

(a) ethylene

(b) auxin

(c) gibberellins

(d) cytokinin

Answer: (b) auxin

32. Which of the following induces flowering in short day plants?

(a) gibberellins

(b) cytokinins

(c) auxin

(d) abscissic acid

Answer: (a) gibberellins

33. Which of the following is caused by gibberellins?

(a) rooting

(b) bolting

(c) epinasty

(d) fruit ripening

Answer: (b) bolting

34. What are morphactins?

(a) auxins

(b) natural growth regulators

(c) synthetic growth regulators

(d) metabolic inhibitors

Answer: (c) synthetic growth regulators

35. Auxins can be synthesized from

(a) tryptophan

(b) pyruvic acid

(c) glycogen

(d) none of the above

Answer: (a) tryptophan

36. Germination of seeds is prevented by

(a) auxins

(b) gibberellins

(c) cytokinin

(d) dormin

Answer: (d) dormin

37. Auxin and ethylene promote

(a) flowering in litchi and pineapple

(b) synchronous flowering in pineapple

(c) increase flowering in cucumbers

(d) all of these

Answer: (d) all of these

38. Hormone causing an apical dominance

(a) auxin

(b) ethylene

(c) gibberellins

(d) all the above

Answer: (a) auxin

 39. Flowering is controlled by the length of light period due to the presence of the pigment

(a) chlorophyll

(b) carotenoid

(c) phytochrome

(d) xanthophylls

Answer: (c) phytochrome

40. Cut leaves can remain green longer if dipped in a solution of

(a) gibberellins

(b) cytokinin

(c) auxin

(d) ethylene

Answer: (b) cytokinin

41. Which of the following induces cell division?

(a) cytokinins

(b) gibberellins

(c) auxins

(d) abscisic acid

Answer: (a) cytokinins

42. Leaf fall occurs when the content of

(a) auxin decreases

(b) cytokinin increases

(c) gibberellic acid decreases

(d) abscisic acid decreases

Answer: (a) auxin decreases

43. Femaleness is induced in plants by

(a) gibberellins

(b) cytokinins

(c) auxin

(d) abscisic acid

Answer: (c) auxin

44. A marked increase in stem length is by

(a) GA

(b) IAA

(c) Florigen

(d) Vernalin

Answer: (a) GA

45. Exponential growth occurs in

(a) Yeast

(b) Bacteria

(c) Asexual reproduction

(d) All of these

Answer: (c) Asexual reproduction

46. Leaf abscission is caused by

(a) ABA

(b) Cytokinin

(c) Auxin

(d) Gibberellin

Answer: (a) ABA

47. Which one of the following breaks dormancy of potato tuber?

(a) Gibberellin

(b) IAA

(c) ABA

(d) Zeatin

Answer: (a) Gibberellin

48. Mobilization of stored food in germinating seed is triggered by?

(a) GA

(b) IAA

(c) Morphactin

(d) None of these

Answer: (a) GA

49. 2,4 D is

(a) weedicide

(b) insecticide

(c) rodenticide

(d) nematicide

Answer: (a) weedicide

50. Cell volume increases due to

(a) auxin

(b) gibberellins

(c) cytokinins

(d) ethylene

Answer: (a) auxin