NCERT CLASS 11 | TOPIC : PLANT PHYSIOLOGY-PLANT GROWTH AND DEVELOPMENT | QB-2 | NEET BIOLOGY ONLINE TEST

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NCERT CLASS 11 | TOPIC : PLANT PHYSIOLOGY-PLANT GROWTH AND DEVELOPMENT | QB-2 | NEET BIOLOGY ONLINE TEST

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It contains 91 important questions. Choose the most correct answer. Then check your answer. Try again if there are errors. Regards : www.onlinetest.kalvisolai.com

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1 ➤ 101. Who crystallized cytokinin?

(a) Skoog and miller (b) Charles Darwin (c) Both (a) and (b) (d) F. W. Went

2 ➤ 102. Skoog and miller termed cytokinin as

(a) Cytokinesis (b) Kinetin (c) Both (a) and (b) (d) None of these

3 ➤ 103. Which three different kinds of inhibitors were found in mid-1960s?

(a) Inhibitor–A, Abscission–II and dormin (b) Inhibitor–B, Abscission–II and dormin (c) Inhibitor–A, Abscission–III and dormin (d) Inhibitor–B, Abscission–III and dormin

4 ➤ 104. All individually found inhibitors in mid-1960s were later named as

(a) Gibberellic acid (b) Auxin (c) Abscisic acid (d) None of these

5 ➤ 105. The volatile substance causing ripening of unripened bananas?

(a) Abscisic acid (b) Auxin (c) Ethylene (d) Terpenes

6 ➤ 106. The only gaseous PGR is ________

(a) IBA (b) Kinetin (c) Terpenes (d) Ethylene

7 ➤ 107. The Greek meaning of ‘Auxein’ is ________

(a) To flower (b) To seed (c) To grow (d) To enlarge

8 ➤ 108. Auxin was first isolated from ________

(a) Frog’s wine (b) Zeatin (c) Human wine (d) None of these

9 ➤ 109. The name ‘Auxin’ was given to which chemical?

(a) Indole-3-acetic acid (b) Indole-6-acetic acid (c) Indole-3-butyric acid (d) Indole-6-butyric acid

10 ➤ 110. How many of the following auxins are obtained from plants?

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IAA, IBA, NAA, 2, 4–D

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(a) 1 (b) 2 (c) 3 (d) 4

11 ➤ 111. NAA stands for ________.

(a) Nitroacetic acid (b) Nitro aceto acetate (c) Naphthaleneacetic acid (d) Naphthaloaceto acetic acid

12 ➤ 112. 2, 4–D stands for ________

(a) 2, 4–Dichlorophenoxy acetate (b) 2, 4–Dextrophenoxy acetate (c) 2, 4–Diphosphenoxy acetate (d) 2, 4–Dichloromethoxy acetate

13 ➤ 113. Synthetic auxins are extesively used in

(a) Agriculture (b) Horticulture (c) Both (a) and (B) (d) None of these

14 ➤ 114. Natural auxins are extensively used in

(a) Agriculture (b) Horticulture (c) Both (a) and (B) (d) None of these

15 ➤ 115. Which effect of auxin is applied worldwide for plant propagation?

(a) Apical dominance (b) Herbicidal action (c) Initiate rooting in stem cutting (d) None of these

16 ➤ 116. Auxins promote flowering in

(a) Tomatoes (b) Pineapples (c) Oranges (d) None of these

17 ➤ 117. What prevents the fruit and leaf to drop in early?

(a) ABA (b) IAA (c) NAA (d) Both (b) and (c)

18 ➤ 118. What promotes the abscission of older mature leaf?

(a) Abscisic acid (b) Auxin (c) Ethylene (d) Cytokinins

19 ➤ 119. In most of the higher plants, the growing apical bud inhibits the growth of lateral bud. This phenomena is called

(a) Apical tolerance (b) Axial intolerance (c) Apical ordinance (d) Apical dominance

20 ➤ 120. What can help removing apical dominance?

(a) Removal of shoot tips (b) Provide plants with a lot of auxin (c) Both (a) and (B) (d) None of these

21 ➤ 121. The process of removal of shoot tip to avoid apical dominance is called _______

(a) Autotomy (b) Decapitation (c) Both (a) and (B) (d) Capitation

22 ➤ 122. Decapitation is widely used for

(a) Tea plantation (b) Hedge making (c) Both (a) and (B) (d) None of these

23 ➤ 123. Which of the following PGR can induce parthenocarpy?

(a) IBA (b) 2, 4–D (c) Terpenes (d) Kinetin

24 ➤ 124. Auxins induce parthenocarpy in which plants?

(a) Tomato (b) Pineapple (c) Apple (d) All of these

25 ➤ 125. Which of the following PGR is widely used as herbicide?

(a) Auxin (b) Gibberellic acid (c) Cytokinins (d) All of these

26 ➤ 126. Which of the following PGR is widely used to kill dicotyledonous weeds?

(a) IAA (b) NAA (c) 2, 4–D (d) ABA

27 ➤ 127. 2, 4–D does not show herbicidal action on

(a) Chicory led ones (b) Monocotyledonous (c) Mature dicotyledonous (d) Mature monocotyledonous

28 ➤ 128. Auxin 2, 4–D is used for what?

(a) To remove weeds from farms by formers (b) To remove weeds from lawn by gardeners (c) To induce flowering in horticulture (d) All of these

29 ➤ 129. Auxin helps in what?

(a) Controlling phloem differentiation (b) Controlling xylem differentiation (c) Cell division (d) Both (b) and (c)

30 ➤ 130. How many varieties of gibberellins reported from widely different variety of organisms?

(a) 100 (b) 120 (c) 145 (d) 140

31 ➤ 131. Different types of gibberellins is reported from what kind of organisms?

(a) Fungi (b) Higher plants (c) Both (a) and (b) (d) None of these

32 ➤ 132. Which of the following was first reported gibberellins to be discovered?

(a) GA1 (b) GA2 (c) GA3 (d) GA4

33 ➤ 133. What is the chemical natural of all the gas?

(a) Basic (b) Acidic (c) Neutral (d) Slightly basic

34 ➤ 134. Gibberellins bring about what kind of change in plants?

(a) Morphological (b) Physiological (c) Genetical (d) None of these

35 ➤ 135. Which ability of gibberellins is used to increase the length of grape stalks?

(a) Ability to increase apically (b) Ability to increase in length of axis (c) Ability to avoid apical dominance (d) All of these

36 ➤ 136. How does gibberellins not change the quality of an apple?

(a) Make it sweeter (b) Elongate it in size (c) Improve its shape (d) All of these

37 ➤ 137. How can gibberellins help to extend the market period?

(a) It delays senescence (b) Increases ripening period (c) Increases flowering time (d) All of these

38 ➤ 138. In the form of sugar, sugarcane stores what?

(a) Proteins (b) Carbohydrates (c) Glycoproteins (d) None of these

39 ➤ 139. On spraying gibberellins on sugarcane crops what major change will it bring?

(a) Increase sweetness (b) Increase length of stem (c) Increase root strength (d) All of these

40 ➤ 140. Spraying of gibberellins over sugarcane can increase the yield by how much?

(a) 20 tonnes/acre (b) 20 kg/acre (c) 20 quintet/acre (d) None of these

41 ➤ 141. What change does it bring in juvenile conifers when sprayed with gas?

(a) Hastens maturity period (b) Hastens germination period (c) Hastens dormancy period (d) None of these

42 ➤ 142. Spraying of gas on juvenile conifers causes

(a) Early flowering (b) Early germination (c) Early seed production (d) All of these

43 ➤ 143. Cytokinins have specific effects on

(a) Cytokinosis (b) cytokinesis (c) Cytoketosis (d) Cytolysis

44 ➤ 144. In what form the cytokinins were discovered?

(a) Terpenes (b) Toluenes (c) Kinetin (d) None of these

45 ➤ 145. Gibberellins promotes bolting in which plants?

(a) Beet (b) Cabbage (c) Both (a) and (b) (d) None of these

46 ➤ 146. Kinetin is ________

(a) Cytokinins (b) Modified form of adenine (c) Purine (d) All of these

47 ➤ 147. Kinetin was first discovered from

(a) Corn kernels (b) Autoclaved herring sperm DNA (c) Coconut milk (d) All of these

48 ➤ 148. Naturally kinetin occurs in

(a) Coconut milk (b) Pineapple (c) Corn (d) None of these

49 ➤ 149. The naturally available cytokinin like substance is

(a) Kinetin (b) Zeatin (c) Both (a) and (b) (d) None of these

50 ➤ 150. Zeatin was isolated from what?

(a) Corn kernels (b) Coconut milk (c) Both (a) and (b) (d) None of these

51 ➤ 151. Where are natural cytokinins synthesized?

(a) Areas of rapid cell division (b) Areas undergoing differentiation (c) Both (a) and (b) (d) None of these

52 ➤ 152. How many of the following PGRs help to overcome apical dominance?

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Auxins, Gibberellins, Cytokinins, Ethylene

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(a) 1 (b) 2 (c) 3 (d) 4

53 ➤ 153. How many of the following PGRs help in delay of senescence?

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Auxins, Gibberellins, Cytokinins, Ethylene

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(a) 1 (b) 2 (c) 3 (d) 4

54 ➤ 154. A plant tissue is undergoing senescence, which PGR would be found in it?

(a) Auxins (b) Gibberellins (c) Cytokinins (d) Ethylene

55 ➤ 155. Large amounts of ethylene is synthesized in

(a) Ripening fruit (b) Newly grown leaf (c) Apex (d) Axial bud

56 ➤ 156. What are the influences of ethylene on plants?

(a) Horizontal growth of seedlings (b) Swelling of the axis (c) Apical hook formation in dicot seedling (d) All of these

57 ➤ 157. What is the of effect of ethylene on plant organs, especially leaves and flowers?

(a) Promotes abscission (b) Promotes senescence (c) Both (a) and (b) (d) None of these

58 ➤ 158. What is the effect of ethylene on ripening fruit?

(a) Increases rate of growth (b) Increase in rate of respiration (c) Both (a) and (b) (d) None of these

59 ➤ 159. Rise in the rate of respiration is called

(a) Respiratory climax (b) Respiratory rise (c) Respiratory climactic (d) None of these

60 ➤ 160. Which of the following PGR is used to break seed and bud dormancy?

(a) Auxins (b) Gibberellins (c) Cytokinins (d) Ethylene

61 ➤ 161. Ethylene initiates germination in which seed?

(a) Mustard (b) Peanut (c) Both (a) and (b) (d) None of these

62 ➤ 162. Sprouting of potato tubers is initiated by which of the following PGR?

(a) Cytokinin (b) Ethylene (c) Both (a) and (b) (d) None of these

63 ➤ 163. How does ethylene help plants to increase their absorption surface?

(a) Promotes growth of root (b) Promotes formation of root hair (c) Both (a) and (b) (d) None of these

64 ➤ 164. Ethylene is used to initiate flowering and for synchronizing fruit set in which fruit?

(a) Apple (b) Pineapple (c) Banana (d) All of these

65 ➤ 165. Ethylene induces flowering in which fruit?

(a) Mango (b) Apple (c) Pineapple (d) All of these

66 ➤ 166. Which of the following is the most widely used PGR in agriculture?

(a) IAA (b) ABA (c) GA3 (d) Ethylene

67 ➤ 167. Which of the following is a characteristic of ethephon?

(a) Readily absorbed (b) Transported within the plant (c) Releases ethylene slowly (d) All of these

68 ➤ 168. Ethephon hastens fruit ripening in

(a) Mango (b) Tomato (c) Apple (d) Both (b) and (c)

69 ➤ 169. Ethephon accelerates abscission in flowers and fruits like

(a) Cherry (b) Walnut (c) Cotton (d) All of these

70 ➤ 170. How does ethephon increase the yield of cucumber?

(a) Promotes senescence (b) Promotes female flowers (c) Promotes male flowers (d) Both (a) and (b)

71 ➤ 171. For which role ABA was discovered?

(a) Abscission (b) Dormancy (c) Both (a) and (b) (d) Ripening fruits

72 ➤ 172. What are the actions of ABA?

(a) General plant growth inhibitor (b) Inhibitor of plant metabolism (c) Stimulates the closure of stomata in epidermis (d) All of these

73 ➤ 173. Why is ABA called stress hormone?

(a) Removes various stresses from plant (b) Increase tolerance of plant to various kind of stresses (c) Both (a) and (b) (d) None of these

74 ➤ 174. ABA plays an important role in all except

(a) Seed development (b) Maturation (c) Dormancy (d) Germination

75 ➤ 175. What is/are the factors that depicts unfavorable growth of seeds?

(a) Desiccation (b) Air (c) Carbon dioxide (d) All of these

76 ➤ 176. ABA is antagonist to

(a) IBA (b) IAA (c) GA2 (d) All of these

77 ➤ 177. All are types of roles played by PGR except

(a) Individualistic (b) Synergistic (c) Both (a) and (b) (d) None of these

78 ➤ 178. Which of the following events are controlled by extrinsic factors via PGR?

(a) Vernalisation (b) Flowering (c) Dormancy (d) All of these

79 ➤ 179. All are extrinsic factors for growth and development except

(a) Temperature (b) Light (c) Both (a) and (b) (d) Nutrition

80 ➤ 180. What kind of plants require the exposure to light for a period exceeding a well defined critical duration?

(a) Short day plants (b) Day-neutral plants (c) Long day plants (d) None of these

81 ➤ 181. What kind of plants require the exposure to light for a period less than critical duration?

(a) Short day plants (b) Day-neutral plants (c) Long day plants (d) None of these

82 ➤ 182. Plants with no such correlation between exposure to light duration and induction of flower response are called

(a) Long day plant (b) Day-neutral plants (c) Short day plant (d) None of these

83 ➤ 183. What is more important of these?

(a) Light period (b) Dark period (c) Both (a) and (b) (d) None of these

84 ➤ 184. According to Hypothesis, which substances are responsible for photoperiodism?

(a) Hormonal substance (b) Abscisic acid (c) Gibberellins (d) All of these

85 ➤ 185. When flowering is either quantitatively or qualitatively dependent or exposure to low temperature it is called ____ phenomenon.

(a) Photoperiodism (b) Thermoperiodism (c) Vernalization (d) Dormancy

86 ➤ 186. Which of the plants don’t have winter and spring varieties?

(a) Wheat (b) Rice (c) Barley (d) Rye

87 ➤ 187. When are winter varieties planted?

(a) Spring (b) Winter (c) Autumn (d) All of these

88 ➤ 188. When is the harvesting of winter varieties done?

(a) Spring (b) Winter (c) Mid-summer (d) Autumn

89 ➤ 189. Biennials are what kind of plants?

(a) Dicarpous (b) Monocarpic (c) Polycarpic (d) None of these

90 ➤ 190. Which of the following are examples of common biennials?

(a) Carrot (b) Cabbages (c) Sugarbeet (d) All

91 ➤ 191. Cold treatment to biennial plants will stimulate what kind of response?

(a) Photo hastens (b) Photoropism (c) Photoperiodism (d) All

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