Solved Examples on Mineral Nutrition

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

Solution:

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

Solution:

Photolysis is catalysed by the protein bound inorganic complex containing manganese ions (oxygen evolving complex) of photosystem II.