Question contain STATEMENT-1 (Assertion) and STATEMENT-2 (Reason).Each question has 4 choices (a), (b), (c) and (d) out of which ONLY ONE is correct.
Statement 1 : Calcium is a constituent of cell wall.
Statement 2 : Calcium is required in mitotic division.
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Solution
Calcium is a constituent of cell walls in the form of calcium pectate. Calcium in small amounts is necessary for normal mitosis. Calcium may be involved in chromatin or mitotic spindle organization.
The first stable product of fixation of atmospheric nitrogen in leguminous plants is :
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Solution
Ammonia is first stable compound produce in fixation of atmospheric nitrogen in leguminous plant. A molecule of nitrogen is change into two molecules of ammonia. It requires 16 ATP, a source of electron donor ferredoxin, hydrogen donor NADPH or FMNH2 and dinitrogenase enzyme.
In root nodules of legumes, leg-haemoglobin is important because
Most of the plants obtain or absorb nitrogen from soil in the form of
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Solution
Chief source of nitrogen for plants are the nitrates of calcium and potassium.
Conduction of inorganic materials in plants occur mainly through
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Solution
Because inorganic materials move with water.
Which one of the following is essential for photolysis of water ?
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Solution
Photolysis is catalysed by the protein-bound inorganic complex containing manganese ions (oxygen evolving complex) of photosystem II.
Which one of the following is not an essential mineral element for plants while the remaining three are?
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Solution
Cadmium is not an essential element for plants. Phosphorusis macronutrient and iron and manganese are micronutrients for plants.
The function of leghaemoglobin in the root nodules of legumesis :
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Solution
Leghaemoglobin is the haemoglobin like red pigments found in root nodules of legumes and reported to function as an oxygen-carrying pigment in symbiotic nitrogen fixation.
Nitrifying bacteria :
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Solution
The nitrifying bacteria bring about transformations of ammonia to nitrite and of nitrite to nitrate.
Which one of the following elements in plants is not remobilised?
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Solution
Calcium is not remobilized from the leaves to the fruits,like potassium, phosphorus and sulphur. It occurs abundantly in a non-exchangeable form such as anorthite(CaAl2Si2O8).