Q131. (a) Moderate decrease or increase of micronutrients causes deficiency and toxicity symptoms respectively.
(b) Excess of manganese causes toxicity of iron, calcium and molybdenum.
(c) A macronutrient is said to be toxic when present below a critical concentration.
(1) Only (a) is correct
(2) Only (b) is correct
(3) (b) & (c) are correct
(4) (a) & (c) are correct
Ans.1
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Q132. Essential elements are
(1) Only micronutrients
(2) Only macronutrients
(3) C, H, O & N only
(4) Both macro and micronutrients
Ans.4
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Q133. Movement of electrolytes through the roots is generally
(1) Against electrochemical gradient and require energy
(2) Along electrochemical gradient and does not require energy
(3) A passive process
(4) Dependent on aquaporins
Ans.1
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Q134. Initial phase of ion uptake
(1) Is passive and apoplastic
(2) Occurs through symplast
(3) Is active process
(4) More than one option is correct
Ans.1
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Q135. The translocation of solute is
(1) Equal to the rate of translocation of water
(2) Dependent on transpiration pull
(3) Through xylem vessel
(4) All of these
Ans.4
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Q136. Process of nitrification and nitrate assimilation are
(1) Oxidation and reduction respectively
(2) Reduction and oxidation respectively
(3) Both are oxidation
(4) Both are reduction
Ans.1
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Q137. Which of the following is/are diazotrophs?
(1) Rhizobium and Azotobacter
(2) Frankia and Klebsiella
(3) Anabaena and Nostoc
(4) All of these
Ans.4
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Q138. Leghemoglobin is found in which one of the following organisms?
(1) Anthoceros
(2) Groundnut
(3) Nostoc
(4) Aulosira
Ans.2
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Q139. How many electron and protons are required to fix a dinitrogen?
(1) 32 each (2) 8 each
(3) 16 each (4) 4 each
Ans.2
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Q140. Cycas and Azolla plants are associated with
(1) Bacillus
(2) Klebsiella
(3) Anabaena
(4) Rhizobium
Ans.3
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