If the leaves of whole plant show chlorosis, the mineral nutrient most likely to be deficient would be:
1. boron
2. manganese
3. nitrogen
4. calcium

Identify the incorrectly matched pair:

The formation and stability of plant cell walls mainly requires:

To regenerate phospophenolpyruvate, C4 and CAM plants require:
1. Boron
2. Manganese
3. Magnesium
4. Sodium

Micronutrients in plants generally act:
1. as cofactors in enzymatic reactions.
2. to enhance regulatory functions.
3. to prevent chlorosis.
4. in the formation of cell walls.

Essential micronutrients in plants:
I. are required in relatively small amounts.
II. are required for a plant to grow from a seed and complete its life cycle.
III. generally help in catalytic functions in the plant.
IV. are of small size and molecular weight.
1. Only I, II and III are correct
2. Only I, II and IV are correct
3. Only II, III and IV are correct
4. All are correct

A condition in which leaves produce insufficient chlorophyll leading to pale, yellow, or yellow-white leaves is called as:
1. Wilting
2. Etiolation
3. Chlorosis
4. Mosaicism

Necrosis of young leaves is a symptom of deficiency of calcium in plants indicating that calcium:
1. is a relatively immobile nutrient in plants.
2. is tied up in formed chlorophyll molecules.
3. is concentrated in the xylem of older leaves.
4. is concentrated in older leaves.

Nitrogen fixation means:
1. releasing nitrogen from dead and decaying materials.
2. conversion of nitrite to nitrate.
3. conversion of nitrate to nitrite.
4. conversion of nitrogen gas into ammonia.

The importance of nitrogen fixation can be judged by the fact that:
1. it can only be done by certain prokaryotes.
2. it is most often the limiting factor in plant growth.
3. it is very expensive in terms of metabolic energy.
4. its availability replaces requirement of some other essential nutrients.