Critical Concentration

Q. Assertion: Plant exhibits deficiency symptoms
Reason: It receives nutrients below critical concentration

1. Both assertion & reason are correct and the reason is the correct explanation of assertion.
2. Both assertion & reason are correct but the reason is not the correct explanation of assertion.
3. Assertion is correct but the reason is incorrect
4. Both assertion & reason are incorrect

Q. The concentration of the essential element below which plant growth is retarded is termed as __ concentration.

Q. Any mineral ion concentration that reduces the dry weight by 10% per unit is considered as

1. Critical
2. Toxic
3. Deficient
4. Lethal

Q.

Manganese toxicity results in deficiency of iron, magnesium and calcium because:

1. It competes with iron and magnesium for uptake and inhibits calcium translocation in the shoot apex

2. It inhibits iron and calcium translocation and binding of magnesium with enzymes

3. It competes with calcium and magnesium for uptake and inhibits iron translocation in the shoot apex

4. It prevents the translocation of iron, magnesium, and calcium from roots to the shoot