It is vital to bubble air into the solute in hydroponic culture to:
1. evenly distribute the dissolved nutrients
2. provide oxygen to the root cells
3. inhibit the growth of fungi
4. inhibit the growth of anaerobic bacteria

More than 90% of the dry weight of plants is due to:

In the symbiotic relationship, rhizobia supply ammonia to the plant and in return receive:
1. Simple sugars
2. Fatty acids
3. Organic acids like malate and succinate
4. Amino acids

Plant growth and development mainly depend on:
1. nitrogen; phosphorus; oxygen
2. potassium; carbon; calcium
3. oxygen; carbon; hydrogen
4. phosphorus; nitrogen; potassium

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