Q81. Plants take zinc in the form of
(1) ZnS (2) ZnO
(3) Zn (4) Zn²+
Ans.4
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Q82. Element necessary for the middle lamella is
(1) са (2) Zn
(3) K (4) Cu
Ans.1
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Q83. Boron in green plants assists in
(1) Activation of enzymes
(2) Acting as enzyme co-factor
(3) Photosynthesis
(4) Sugar transport
Ans.4
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Q84. The most abundant element present in the plants is
(1) Carbon
(2) Nitrogen
(3) Manganese
(4) Iron
Ans.1
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Q85. Necrosis in crops is due to the deficiency of
(1) Ca, K, S and Mo
(2) N, K, S and Mo
(3) N, S, Fe and Zn
(4) Mg, S, Mn and Ca
Ans.1
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Q86. Which of the following is not caused by deficiency of mineral nutrition?
(1) Etiolation
(2) Shortening of internode
(3) Necrosis
(4) Chlorosis
Ans.1
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Q87. When the plants are grown in magnesium deficient but urea rich soil, the symptoms expressed are
(1) Yellowish leaves
(2) Colourless petiole
(3) Dark green leaves
(4) Shoot apex die
Ans.1
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Q88. The major portion of the dry weight of plants comprises of
(1) Nitrogen, phosphorus and potassium
(2) Calcium, magnesium and sulphur
(3) Carbon, nitrogen and hydrogen
(4) Carbon, hydrogen and oxygen
Ans.4
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Q89. Grey spots of oat are caused by deficiency of
(1) Cu (2) Zn
(3) Mn (4) Fe
Ans.3
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Q90. Which two distinct microbial processes are responsible for the release of fixed nitrogen as dinitrogen gas (N2) to the atmosphere?
(1) Anaerobic ammonium oxidation, and denitrification
(2) Aerobic nitrate oxidation, and nitrite reduction
(3) Decomposition of organic nitrogen, and conversion of dinitrogen to ammonium compounds
(4) Enteric fermentation in cattle, and nitrogen fixation by Rhizobium in root nodules of legumes
Ans.1
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