(a) Soil are reservoir of all mineral elements that are essential for the proper growth and development of plants.

(b) Initial uptake of minerals into the symplast is slow

(c) Uptake of minerals in inner space is rapid

1. All are correct

2. Only (a) is incorrect

3. (b) & (c) are incorrect

4. Only (c) is incorrect

All the given statements are correct with respect to fate of ammonia, except

1. Glutamine and asparagine are two most important amides in plants

2. $\mathrm{\alpha }$-ketoglutaric acid provides carbon skeleton for the process of reductive amination process

3. Amides are transported through sieve tubes

4. Glutamic acid is the main amino acid that provides NH₂ group during transamination process

How many of the following elements are considered to be micronutrients for plants?

Iron, Phosphorus, Sulphur, Magnesium, Copper, Boron, Zinc, Chlorine.

1. Four
2. Three
3. Six
4. Five

Nitrococcus is

1. Photosynthetic

2. Nitrifying bacteria

3. Helpful in nitrate assimilation

4. Nitrogen fixing bacteria

Select the incorrect match

1. Low level of Mo, S, N – delay in flowering

2. Inhibition of cell division – due to lack of Mo, S, N, K

3. Death of tissue – due to deficiency of S, N, Cl

4. Chlorosis – due to deficiency of N, K, Mg, Fe, Mn

The reduction of one molecule of atmospheric nitrogen (N₂) into two molecules of ammonia by nitrogenase enzyme requires

1. 4e^–, 4H⁺, and 8ATP

2. 4e^–, 4H⁺, and 16ATP

3. 8e^–, 8H⁺, and 8ATP

4. 8e^–, 8H⁺, and 16ATP

Which one of the following roles is not characteristic of an essential element?

Which one of the following statements can best explain the term critical concentration of an essential element?

Deficiency symptoms of an element tend to appear first in young leaves. It indicates that the element is relatively immobile. Which one of the following elemental deficiency would show such symptoms?

1.  Sulphur

2.  Magnesium

3.  Nitrogen

4.  Potassium

Which one of the following symptoms is not due to manganese toxicity in plants?