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Question1: Which one of the following elements in plants is not remobilized? [CBSE PMT’2011]
(a) Phosphorous
(b) Calcium
(c) Potassium
(d) Sulphur
Answer: b
Solution:
Calcium is not remobilized from the leaves to the fruits, like potassium, phosphorous and sulphur. It occurs abundantly in a non-exchangeable form such as anorthite (CaAl2Si2O8).
Question2: Which one of the following is not an essential mineral element for plants while the remaining three are? [CBSE PMT’2011]
(a) Iron
(b) Manganese
(c) Cadmium
(d) Phosphorous
Answer: c
Cadmium is not an essential element for plants. Phosphorous is macronutrient and iron and manganese are micronutrients for plants.
Question3: Which one of the following is essential for photolysis of water? [CBSE PMT’2011]
(a) Manganese
(b) Zinc
(c) Copper
(d) Boron
Answer: a
Photolysis is catalysed by the protein bound inorganic complex containing manganese ions (oxygen evolving complex) of photosystem II.
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