Q41. Element that has its role in activation of enzyme nitrogenase is
(1) Mn (2) Mo
(3) Zn (4) Mg
Ans.2
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Q42. Deficiency symptoms of essential elements
(a) Vary from element to element
(b) Depend on mobility of elements also
(c) Disappear when the deficient mineral nutrient is provided to the plant
(1) Only (a)
(2) Only (c)
(3) Only (a) and (b)
(4) All (a) (b) and (c)
Ans.4
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Q43. The deficiency symptoms of the immobile elements tend to appear first in the young tissues Select that elements
(1) Ca (2) N, P
(3) B, N (4) Mn
Ans.1
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Q44. Which of the following bacteria reduce nitrate in soil into nitrogen?
(1) Nitrosomonas
(2) Nitrococcus
(3) Nitrobacter
(4) Thiobacillus
Ans.4
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Q45. Thiobacillus is a group of bacteria helpful in carrying out
(1) Nitrogen fixation
(2) Chemoautotrophic fixation
(3) Nitrification
(4) Denitrification
Ans.4
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Q46. In which of the following forms is iron absorbed by plants?
(1) Ferric
(2) Ferrous
(3) Both ferric and ferrous
(4) Free element
Ans.1
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Q47. Which of the following elements is responsible for maintaining turgor in cells
(1) Magnesium
(2) Sodium
(3) Calcium
(4) Potassium
Ans.4
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Q48. Which is essential for the growth of root tip?
(1) Zn (2) Fe
(3) Ca (4) Mn
Ans.3
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Q49. In which of the following all three are macronutrients?
(1) Nitrogen, sulphur, phosphorus
(2) Boron, zinc, manganese
(3) Iron, copper, molybdenum
(4) Molybdenum, magnesium, manganese
Ans.1
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Q50. During biological nitrogen fixation, inactivation of nitrogenase by oxygen poisoning is prevented by
(1) Cytochrome
(2) Leghaemoglobin
(3) Xanthophyll
(4) Carotene
Ans.2
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