plant growth mcqs

 FOR PRACTICE

CHAPTER 7 :- PLANT GROWTH AND MINERAL NUTRITION

1. Auxins are produced by 

a) stem apex    b) Leaf 

c) flower d) fruit

2. 2,4-Dichlorophenoxy acetic acid is a a) pesticide      b) herbicide

c) flowering hormone 

d) rooting hormone

3. A genetically dwarf plant can bel 

converted into a tall plant by the use

of 

a) kinetin       b) AA/x-rays 

c) 2,4-D d) GA3

4. In plants, growth is due to 

a) parenchyma b) cpllenchyma

c) sclerenchyma d) meristem

5. Germination of the seed is promoted

by

a) green light b) red light 

c) blue light    d) infrared light 

6. Which of the following induces celll

division in a cell 

a) cytokinins   b) gibberellins 

c) auxins        d) ABA 

7. Which  of the  following fungus is 

associated with discovery of gibber-

ellins 

a) Rhizopus      b) Fusarium 

c) Aspergillus d) penicillium 

8. Differentiation of shoot is controlled

by 

a) high auxin : cytokinin ratio

b) high auxin : auxin ratio

c) high gibberellin : auxin’ ratio

d) high gibberellin : cytokinin ratio

9. Seed dormancy is due tojthe 

a) ethylene      b) abscisic acid 

c) IAA d) strach 

10. Short day plants require.

A) light b) night

c) long day period d) long night period

11. Which one of the following pairs is

correctly metched 

a) auxin-cell division      

b) gibberellins-internodal elongation

c) cytokinin-fruit ripening

d) ethylene apical dominance

12.Opening and closing of flowers in 

response to light and darkness is

called

a) phototropism b) photop’eriodism 

c) photoplasty    d) photon’asty

13. In plants flowering is influenced by a) soil water content   

b) soil acidity

c) photoperiod

d) content of green pigment

14. The long day plants have

a) Short night requirement for 

flowering

b) No night requirement for flowering

c) Long night requirement for 

flowering

d) Short day requirement’for 

flowering

15. The maximum growth phHse is 

a) Lag phase    b) steady phase

c) log phase   d) senescent phase

16. Correct sequence of different phases

of growth is

a) cell division, cell differentiation,

cell elongation

b) cell differentiation, cell division,

cell elongation

c) cell elongation, cell division, cell

differentiation

d) cell division, cell elongation, cell

differentiation

17. When the dark period of short plant

is interrupted by a brief exposure of

light the plant

a) flowers immediately

b) will not flower at all

c) gives more flowers

d) turns into a long day plant

18. The rate of growth of any organism 

follows

a) Hyperbolic curve b) J-shaped curve c) Sigmoid curve       d) Parabolic curve

19. Which of the following hormones

owes its discovery to tissue culture

technique 

a) Auxin b) abscissic acid 

c) Gibberellins d) Cytokinin

20. The growth hormones responsible for

bolting are

a) Auxins        b) kinetin 

c) coumarins   d) Gibberellins

21. Sprouting of potatoes under storage

condition is due to

a) Auxin b) Gibberellins

c) Ethylene    d) Cytokinin

22. Gibberellins induce

a) Flowering

b) Production of hydrolyzing 

enzymes in germinating seeds

c) cell division 

d) Hasten leaf senescence 

23. Certain chemical substances having

profound effect on growth are called a) Catalytic agents    b) Phytohormoes c) Enzymes         d) Compost

24. Which hormones promote flowering

in long day plants and also control

sex expression

a) Cytokinins  b) Gibberellins 

c) ethylene      d) Auxin

25. The following is a naturally 

occurring growth inhibitor

a) IAA    b) ABA    c) NAA     d) GA3 

26. bakanae disease in the rice plants

(paddy) is caused by

a) Naphthalene acetic acid (NAA)

b) 2, 4-Dichlorophenoxy acetic acid

(2,4D)

c) Gibberellic acid

d) Indole acetic acid (IAA) 

27. All cytokinins are

a) Acidic b) Amiropurines

c) Phenols    d) Glucosides 

28. Induction of formation of interfas-

cicular cambium is by

a) Kinetin       b) Gibberellins 

c) Morphactin d) Zeatin

29. Which of the following is a growth

retardant

a) Adenine        b) Ascorbic acid 

c) Morphactin d) Zeatin

30. Which one of the following hormones

is not found in plants

a) 2-4-D b) GA3 

c) Gibberellins    d) IAA

31. Leaf fall starts when the amount of 

a) Auxin decreases   

b) Auxin increases

c) Abscissic acid decreases

d) Gibberellinc acid decreases

32. The hormones which has negative

effect on a apical dominance is 

A) Cytokinin  b) Auxin 

c) 2,4-D d) GA3

33. A  genetically  dwarf plant  can  be

converted into a tall plant by the use

of

a)Kinetin        b) AA/X-rays 

c) 2,4-D d) GA3

34. The chemical nature of kinetin is 

a) Butyric acid b) indole butyric acid

c) 6-furfuryl amino purine

d) indole acetic acid

35. Example of epigeal germination is 

a) castor b) Gram  c)Pea d) Maize

36. Example of hypogeal germination is

a) Maize b) Castor 

c) Tamarind d) Sword

37. Apical meristem includes 

a) shoot apex    b) Cambium 

c) Leaf-bud      d) Pericycle

38. Closing of stomata is regulated by 

a) ABA b) Auxins 

c) Gibberellins d) Cytokinins

39.Fruit ripening is principally

associatec with

a) Auxins        b) Cytokinins 

c) ABA d) Ethylene

40. Chlorophyll development requires 

a) Auxins b) Cytokinins 

c) ABA d) Ethylene

41. Low temperature promotion of 

flowering is called

A) Vernalization b) Photoperiodism 

c) Quiescence d) Dormancy

42. Viviparous germination is found in

a) hydrophytic plants 

b) mangrove plant 

c) xerophytic plants 

d) all tropical plants

43. Gibberellins were first discovered

from 

a) Bacteria      b) Fungi 

c) algae d) gymnosperms

44. Which of the following is not a short

day plant

a) Cosmos        b) Dahlia 

c) Wheat d) Chrysanthemum

45. Epigeal germination found in 

a) most of monocots b) most of dicots

c) all higher plants

d) most of the dicots and some monocots

46. The micropyle in the helps in the

entry of

a) pollen grain b) pollen tube 

c) water d) male gametes

47. A hormone involved in the flowering

of plant is

a) Kinetin       b) Florigen

c) zeatin d) phytochrome

48. In which of the following organs,

concentration of auxins

a) Lateral bud b) Apical bud

c) young leaves d) Mature leaves

49. Which of the following is antigibberellin

a) Auxins        b) Ethylene

c) ABA d) Cytokinins

50. Which of the following is not a 

naturally occuring hormone

a) 2,4-D   b) kinetin  c) GA   d) Auxin

51. The maximum growth rate is occurs

in a 

a) Lag phase    b) Exponential phase 

c) Stationaryphase d)senescent phase 

52. In short day plants flowerig is 

induced by

a) Long night

b) Photoperiod less than 12 hours

c) Short photoperiod and interrupted

   long night

d) Phoroperiod shorter than initial

value and uninterrupted long night

53. Which one of the following plant 

hormone is known as a stress 

hormone

a) Cytokinin b) Auxin

c) Abscissic acid d) Gibberellinc acid

54. The plants responded to phoroperiods

due to the presence of

a) Photochromes b) Enzymes 

c) Phytohormones d) Stomata 

55. Growth of plant in diameter is caused

by

a) Apical meristem

b) Secondary meristem

c) Intercalary meristem

d) Cork cambium

56. A genetically dwarf pea plant can be

converted into tall pant by use of

a) 2,4-D b) Ethylene

c) Cytokinin  d) Gibberellic acid

57. In   short  day   plants   flowering  is

interrupted by

a) Dark period interrupted

b) Light period is interrupted by

dark period

c) Dark period is interrupted by far

red light

d) Dark condition is interrupted by

red and then far red light 

58. Coconut milk factor is

a) IAA    b) GA3    c) ABA     d) Cytokinin

59. By  which  method   testa  is  made

permeable to water

a) Stratification        b) Vernalization

c) Denudation        d) Scarification

60. The induction of flowering by low

temperature treatment is called

a) Vernalization      b) Photoperiodism

c) Tissue culture  d) Pruning

61. The photoperiodic stimulus is 

perceived by

a) Buds b) Leaves

c) Flowers      d) Meristems