NCERT CLASS 11 | TOPIC : PLANT PHYSIOLOGY-PLANT GROWTH AND DEVELOPMENT | PYQB (LATEST) | NEET BIOLOGY ONLINE TEST ~ Kalvisolai Online Test

NCERT CLASS 11 | TOPIC : PLANT PHYSIOLOGY-PLANT GROWTH AND DEVELOPMENT | PYQB (LATEST) | NEET BIOLOGY ONLINE TEST

It contains 00 important questions. Choose the most correct answer. Then check your answer. Try again if there are errors. Regards : www.onlinetest.kalvisolai.com

1 ➤ 1. The process of growth is maximum during (2020)

(a) log phase (b) lag phase (c) senescence (d) dormancy.

2 ➤ 2. Typical growth curve in plants is (2015 Cancelled)

(a) stair-steps shaped (b) parabolic (c) sigmoid (d) linear.

3 ➤ 3. In tissue culture experiments, leaf mesophyll cells are put in a culture medium to form callus. This phenomenon may be called as (2023)

(a) development (b) senescence (c) differentiation (d) dedifferentiation.

4 ➤ 4. Which one of the following plants does not show plasticity? (2022)

(a) Cotton (b) Coriander (c) Buttercup (d) Maize

5 ➤ 5. Plants follow different pathways in response to environment or phases of life to form different kinds of structures. This ability is called (2021)

(a) maturity (b) elasticity (c) flexibility (d) plasticity.

6 ➤ 6. Senescence as an active developmental cellular process in the growth and functioning of a flowering plant, is indicated in (2008)

(a) annual plants (b) floral parts (c) vessels and tracheid differentiation (d) leaf abscission.

7 ➤ 7. Which hormone promotes internode/petiole elongation in deep water rice? (2023)

(a) Ethylene (b) 2, 4-D (c) GA3 (d) Kinetin

8 ➤ 8. Spraying of which of the following phytohormone on juvenile conifers helps in hastening the maturity period, that leads to early seed production? (2023)

(a) Zeatin (b) Abscisic Acid (c) Indole-3-butyric Acid (d) Gibberellic Acid

9 ➤ 9. The gaseous plant growth regulator is used in plants to

(a) speed up the malting process (b) promote root growth and root hair formation to increase the absorption surface (c) help overcome apical dominance (d) kill dicotyledonous weeds in the fields.

10 ➤ 10. Production of cucumber has increased manifold in recent years. Application of which of the following phytohormones has resulted in this increased yield as the hormone is known to produce female flowers in the plants (2022)

(a) ABA (b) gibberellin (c) ethylene (d) cytokinin

11 ➤ 11. The plant hormone used to destroy weeds in a field is (2021)

(a) IBA (b) IAA (c) NAA (d) 2, 4-D.

12 ➤ 12. Name the plant growth regulator which upon spray- ing on sugarcane crop, increases the length of stem. thus increasing the yield of sugarcane crop. (2020)

(a) Cytokinin (b) Gibberellin (c) Ethylene (d) Abscisic acid

13 ➤ 13. Which of the following is not an inhibitory sub stance governing seed dormancy? (2020)

(a) Gibberellic acid (b) Abscisic acid (c) Phenolic acid (d) Para-ascorbic acid

14 ➤ 14. It takes very long time for pineapple plants to pro- duce flowers. Which combination of hormones can be applied to artificially induce flowering in pine apple plants throughout the year to increase yield? (2019)

(a) Cytokinin and Abscisic acid (b) Auxin and Ethylene (c) Gibberellin and Cytokinin (d) Gibberellin and Abscisic acid

15 ➤ 15. Fruit and leaf drop at early stages can be prevented by the application of (2017)

(a) ethylene (b) auxins (c) gibberellic acid (d) cytokinins.

16 ➤ 16. You are given a tissue with its potential for differentiation in an artificial culture. Which of the following pairs of hormones would you add to the medium to secure shoots as well as roots? (NEET-II 2016)

(a) IAA and gibberellin (b) Auxin and cytokinin (c) Auxin and abscisic acid (d) Gibberellin and abscisic acid

17 ➤ 17. The Avena curvature is used for bioassay of (NEET-I 2016)

(a) IAA (b) ethylene (c) ABA (d) GA.

18 ➤ 18. Auxin can be bioassayed by (2015)

(a) potometer (b) lettuce hypocotyl elongation (c) Avena coleoptile curvature (d) hydroponics.

19 ➤ 19. What causes a green plant exposed to the light, on only one side, to bend towards the source of light as it grows? (2015 Cancelled)

(a) Light stimulates plant cells on the lighted side to grow faster. (b) Auxin accumulates on the shaded side, stimulating greater cell elongation there. (c) Green plants need light to perform photosynthesis. (d) Green plants seek light because they are phototropic.

20 ➤ 20. Dr. F. Went noted that if coleoptile tips were removed and placed on agar for one hour, the agar would produce a bending when placed on one side of freshly-cut coleoptile stumps. Of what significance is this experiment? (2014)

(a) It made possible the isolation and exact identification of auxin. (b) It is the basis for quantitative determination of small amounts of growth-promoting substances. (c) It supports the hypothesis that IAA is auxin. (d) It demonstrated polar movement of auxins.

21 ➤ 21. Which one of the following growth regulators is known as 'stress hormone'? (2014)

(a) Abscisic acid (b) Ethylene (d) Indole acetic acid (c) GA3

22 ➤ 22. During seed germination, its stored food is mobilized by (2013)

(a) ABA (b) gibberellin (c) ethylene (d) cytokinin.

23 ➤ 23. The pineapple which under natural condition is difficult to blossom has been made to produce fruits throughout the year by application of (Karnataka NEET 2013)

(a) NAA, 2, 4-D (b) Phenyl acetic acid (c) Cytokinin (d) IAA, IBA.

24 ➤ 24. Through their effects on plant growth regulators, what do the temperature and light control in the plants? (Mains 2012)

(a) Apical dominance (b) Flowering (c) Closure of stomata (d) Fruit elongation.

25 ➤ 25. Which one of the following generally acts as an antagonist to gibberellins? (Mains 2012)

(a) Zeatin (b) Ethylene (c) ABA (d) IAA

26 ➤ 26. Phototropic curvature is the result of uneven distribution of (2010)

(a) gibberellin (b) phytochrome (c) cytokinins (d) auxin.

27 ➤ 27. One of the commonly used plant growth hormone in tea plantations is (Mains 2010)

(a) ethylene (b) abscisic acid (c) zeatin (d) indole-3-acetic acid.

28 ➤ 28. Root development is promoted by (Mains 2010)

(a) abscisic acid (b) auxin (c) gibberellin (d) ethylene.

29 ➤ 29. One of the synthetic auxin is (2009)

(a) IAA (b) GA (c) IBA (d) NAA.

30 ➤ 30. Which one of the following acids is a derivative of carotenoids? (2009)

(a) Indole-3-acetic acid (b) Gibberellic acid (c) Abscisic acid (d) Indole butyric acid

31 ➤ 31. Which one of the following pairs, is not correctly matched? (2007)

(a) Gibberellic acid - Leaf fall (b) Cytokinin - Cell division (c) IAA-Cell wall elongation (d) Abscissic acid Stomatal closure

32 ➤ 32. Parthenocarpic tomato fruits can be produced by (2006)

(a) treating the plants with phenylmercuric acetate (b) removing androecium of flowers before pollen grains are released (c) treating the plants with low concentrations of gibberellic acid and auxins (d) raising the plants from vernalized seeds.

33 ➤ 33. How does pruning help in making the hedge dense? (2006)

(a) It releases wound hormones. (b) It induces the differentiation of new shoots from the rootstock. (c) It frees axillary buds from apical dominance. (d) The apical shoot grows faster after pruning.

34 ➤ 34. Cell elongation in internodal regions of the green plants takes place due to (2004)

(a) indole acetic acid (b) cytokinins (c) gibberellins (d) ethylene.

35 ➤ 35. Coconut milk factor is (2003)

(a) an auxin (b) a gibberellin (c) abscisic acid (d) cytokinin.

36 ➤ 36. Plants deficient of element zinc, show its effect on the biosynthesis of plant growth hormone (2003)

(a) auxin (b) cytokinin (c) ethylene (d) abscisic acid.

37 ➤ 37. Differentiation of shoot is controlled by (2003)

(a) high auxin: cytokinin ratio (b) high cytokinin: auxin ratio (c) high gibberellin: auxin ration (d) high gibberellin: cytokinin ratio.

38 ➤ 38. Dwarfness can be controlled by treating the plant with (2002, 1992)

(a) cytokinin (b) gibberellic acid (c) auxin and abscisic acid (d) anti-gibberellin.

39 ➤ 39. Which of the following prevents the fall of fruits? (2001)

(a) GA (b) NAA (c) Ethylene (d) Zeatin

40 ➤ 40. Hormone responsible for senescence is (2001)

(a) ABA (b) auxin (c) GA (d) cytokinin.

41 ➤ 41. Which hormone breaks dormancy of potato tuber? (2001)

(a) Gibberellin (b) IAA (c) ABA (d) Zeatin

42 ➤ 42. If the apical bud has been removed then we observe (2000)

(a) more lateral branches (b) more axillary buds (c) plant growth stops (d) flowering stops.

43 ➤ 43. Which hormone is responsible for fruit ripening? (2000)

(a) Ethylene (b) Auxin (c) Ethyl chloride (d) Cytokinin

44 ➤ 44. ABA is involved in (1999)

(a) shoot elongation (b) increased cell division (c) dormancy of seeds (d) root elongation.

45 ➤ 45. A plant hormone used for inducing morphogenesis in plant tissue culture is (1998)

(a) cytokinins (b) ethylene (c) abscisic acid (d) gibberellins.

46 ➤ 46. Which combination of gases is suitable for fruit ripening? (1998)

(a) 80% CH, and 20% CO₂ (b) 80% CO₂ and 20% O₂ (c) 80% C₂H, and 20% CO₂ (d) 80% CO, and 20% CH₂

47 ➤ 47. Which one among the following chemicals is used for causing defoliation of forest trees? (1998)

(a) Malic hydrazide (b) 2, 4-D (c) Amo-1618 (d) Phosphon D

48 ➤ 48. Gibberellic acid induces flowering (1997)

(a) in short day plants under long day conditions (b) in day-neutral plants under dark conditions (c) in some gymnospermic plants only (d) in long day plants under short day conditions.

49 ➤ 49. The movement of auxin is largely (1994)

(a) centripetal (b) basipetal (c) acropetal (d) both (a) and (c).

50 ➤ 50. If the growing plant is decapitated, then (1994)

(a) its growth stops (b) leaves become yellow and fall down (c) axillary buds are inactivated (d) axillary buds are activated.

51 ➤ 51. Removal of apical bud results in (1993)

(a) formation of new apical bud (b) elongation of main stem (c) death of plant (d) formation of lateral branching.

52 ➤ 52. The regulator which retards ageing/senescence of plant parts is (1994)

(a) cytokinin (b) auxin (c) gibberellin (d) abscisic acid.

53 ➤ 53. The hormone produced during adverse environmental conditions is (1993)

(a) benzyl aminopurine (b) bichlorophenoxy acetic acid (c) ethylene (d) abscisic acid.

54 ➤ 54. Klinostat is employed in the study of (1993)

(a) osmosis (b) growth movements (c) photosynthesis (d) respiration.

55 ➤ 55. Which is produced during water stress that brings stomatal closure? (1993)

(a) Ethylene (b) Abscisic acid (c) Ferulic acid (d) Coumarin

56 ➤ 56. Bananas can be prevented from over-ripening by (1993)

(a) maintaining them at room temperature (b) refrigeration (c) dipping in ascorbic acid solution (d) storing in a freezer.

57 ➤ 57. Apical dominance is caused by (1992)

(a) abscisic acid in lateral bud (b) cytokinin in leaf tip (c) gibberellin in lateral buds (d) auxin in shoot tip.

58 ➤ 58. Cytokinins (1992)

(a) promote abscission. (b) influence water movement (c) help retain chlorophyll (d) inhibit protoplasmic streaming.

59 ➤ 59. Which is employed for artificial ripening of banana fruits? (1992)

(a) Auxin (b) Coumarin (c) Ethylene (d) Cytokinin

60 ➤ 60. Abscisic acid causes (1991)

(a) stomatal closure (b) stem elongation (c) leaf expansion (d) root elongation.

61 ➤ 61. The hormone responsible for apical dominance is (1991)

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

62 ➤ 62. Hormone primarily connected with cell division is (1991, 1988)

(a) IAA (b) NAA (c) cytokinin/zeatin (d) gibberellic acid.

63 ➤ 63. Highest auxin concentration occurs (1990)

(a) in growing tips (b) in leaves (c) at base of plant organs (d) in xylem and phloem.

64 ➤ 64. Phytohormones are (1990)

(a) chemical regulating flowering (b) chemical regulating secondary growth (c) hormones regulating growth from seed to adulthood (d) regulators synthesised by plants and influencing physiological processes.

65 ➤ 65. Abscisic acid controls (1990)

(a) cell division (b) leaf fall and dormancy (c) shoot elongation (d) cell elongation and wall formation.

66 ➤ 66. Phototropic and geotropic movements are linked to (1990)

(a) gibberellins (b) enzymes (c) auxin (d) cytokinins.

67 ➤ 67. Which of the following movement is not related to auxin level? (1990)

(a) Bending of shoot towards light (b) Movement of root towards soil (c) Nyctinastic leaf movements (d) Movement of sunflower head tracking the sun

68 ➤ 68. Leaf fall can be prevented with the help of (1989)

(a) abscisic acid (b) auxins (c) florigen (d) cytokinins.

69 ➤ 69. Mowing grass lawn facilitates better maintenance because (1989)

(a) wounding stimulates regeneration (b) removal of apical dominance and stimulation of intercalary meristem (c) removal of apical dominance (d) removal of apical dominance and promotion of lateral meristem.

70 ➤ 70. Cut or excised leaves remain green for long if induced to root or dipped in (1988)

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

71 ➤ 71. Gibberellins promote (1988)

(a) seed germination (b) seed dormancy (c) leaf fall (d) root elongation.

72 ➤ 72. The site of perception of light in plants during photoperiodism is (2021)

(a) leaf (b) shoot apex (c) stem (d) axillary bud.

73 ➤ 73. What is the site of perception of photoperiod necessary for induction of flowering in plants? (2019)

(a) Leaves (b) Lateral buds (c) Pulvinus (d) Shoot apex

74 ➤ 74. Phytochrome is a (NEET-II 2016)

(a) flavoprotein (b) glycoprotein (c) lipoprotein (d) chromoprotein.

75 ➤ 75. Photoperiodism was first characterised in (2010)

(a) tobacco (b) potato (c) tomato (d) cotton.

76 ➤ 76. Importance of day length in flowering of plants was first shown in (2008)

(a) cotton (b) Petunia (c) Lemna (d) tobacco.

77 ➤ 77. The wavelength of light absorbed by Pr form of phytochrome is (2007)

(a) 680 nm (b) 720 nm (c) 620 nm (d) 640 nm.

78 ➤ 78. One set of the plant was grown at 12 hours day and 12 hours night period cycles and it flowered while in the other set night phase was interrupted by flash of light and it did not produce flower. Under which one of the following categories will you place this plant? (2004)

(a) Long day (b) Darkness neutral (c) Day neutral (d) Short day

79 ➤ 79. Which pigment absorbs the red and far-red light? (2002)

(a) Cytochrome (b) Phytochrome (c) Carotenoids (d) Chlorophyll

80 ➤ 80. Which plant is LDP? (2001)

(a) Tobacco (b) Glycine max (c) Mirabilis jalapa (d) Spinach

81 ➤ 81. Proteinaceous pigment which controls the activities concerned with light is (2001)

(a) phytochrome (b) chlorophyll (c) anthocyanin (d) carotenoids.

82 ➤ 82. The response of different organisms to the environmental rhythms of light and darkness is called (1998)

(a) vernalisation (b) photoperiodism (c) phototaxis (d) phototropism.

83 ➤ 83. Phytochrome becomes active in (1998)

(a) red light (b) green light (c) blue light (d) none of these.

84 ➤ 84. A pigment which absorbs red and far-red light is (1997)

(a) cytochrome (b) xanthophyll (c) phytochrome (d) carotene.

85 ➤ 85. What will be the effect on phytochrome in a plant subjected to continuous red light? (1997)

(a) will increase Phytochrome synthesis (b) Level of phytochrome will decrease (c) Phytochrome will be destroyed (d) First (b) then (a)

86 ➤ 86. If a tree flowers thrice in a year (Oct, Jan and July) in Northern India, it is said to be (1997)

(a) photo and thermo-insensitive (b) photo and thermo-sensitive (c) photosensitive but thermo-insensitive (d) thermosensitive but photo-insensitive.

87 ➤ 87. In short day plants, flowering is induced by (1992)

(a) photoperiod less than 12 hours (b) photoperiod below a critical length and uninterrupted long night (c) long night (d) short photoperiod and interrupted long night.