Deficiency of which of the given groups of elements causes necrosis?

1. Ca, Mg, Cu

2. N, S, Fe

3. N, S, Mo

4. K, S, Mo

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

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

Nitrococcus is

1. Photosynthetic

2. Nitrifying bacteria

3. Helpful in nitrate assimilation

4. Nitrogen fixing bacteria

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

(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

Read the following statement & select the correct sequence of steps during symbiotic nitrogen fixation?

(a) interaction between Rhizobium & leguminous plant 

(b) Root nodule formation 

(c) Formation of ammonia

(d) leghaemoglobin

(e) Amino acid synthesis

1. a$\to$ b$\to$ c$\to$ e $\to$d

2. b$\to$ a$\to$d$\to$ e $\to$c

3. a$\to$ b$\to$c$\to$ d$\to$ e

4. a$\to$ b$\to$ d$\to$ c$\to$ e

Which of the following enzyme is not operational in Rhizobium during free-living conditions?

1. Aldolase

2. Nitrogenase

3. Enolase

4. Mutase

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