Q71. Nitrogen fixation in root nodules of Alnus is brought about by
(1) Azorhizobium
(2) Bradyhizobium
(3) Clostridium
(4) Frankia
Ans.4
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Q72. Which of the following is a flowering plant with nodules containing filamentous nitrogen-fixing microorganism?
(1) Cicer arietinum
(2) Casuarina equisetifolia
(3) Crotalaria juncea
(4) Cycas revolute
Ans.2
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Q73. Which one of the following elements is not an essential micronutrient for plant growth?
(1) Ca (2) Zn
(3) Mn (4) Cu
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Q74. Which one of the following statements is correct?
(1) At present it is not possible to grow maize without chemical fertilizers.
(2) Extensive use of chemical fertilizers may lead to eutrophication of nearby water bodies.
(3) Both Azotobacter and Rhizobium fix atmospheric nitrogen in root nodules of plants.
(4) Cyanobacteria such as Anabaena and Nostoc are important mobilizers of phosphates and potassium for plant nutrition in soil.
Ans.2
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Q75. A plant requires magnesium for
(1) Cell wall development
(2) Holding cells together
(3) Protein synthesis
(4) Chlorophyll synthesis
Ans.4
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Q76. About 98 percent of the mass of every living organism is composed of just six elements including carbon, hydrogen, nitrogen, oxygen and:
(1) Calcium and phosphorous
(2) Phosphorus and sulphur
(3) Sulphur and magnesium
(4) Magnesium and sodium
Ans.1
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Q77. Sulphur is an important nutrient for optimum growth and productivity in
(1) Pulse crops
(2) Cereals
(3) Fibre crops
(4) Oil seed crops
Ans.4
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Q78. The deficiencies of micro-nutrients, not only affects growth of plants but also vital functions such as photosynthetic and mitochondrial electron flow Among the list given below, which group of three elements shall affect most, both photosynthetic and mitochondrial electron transport?
(1) Cu, Mn, Fe
(2) Co, Ni, Mo
(3) Ca, X, Na
(4) Mn, Co, Ca
Ans.1
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Q79. Which of the following elements is a constituent of biotin?
(1)Sulphur
(2) Calcium
(3) Magnesium
(4) Phosphorus
Ans.1
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Q80. Which one of the following elements is almost non-essential for plants?
(1) Zn (2) Na
(3) Ca (4) Mo
Ans.2
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