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

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

Mark the correct one (with respect to anaerobic free-living diazotroph)

1. Azotobacter

2. Clostridium

3. Rhizobium

4. Frankia

Find the incorrect statement with respect to mineral absorption 

1. Uptake of $K^{+}$ ions into outer or free space of cells is passive

2. In the metabolic phase $C{a}^{2+}$ ions pass into inner space, i.e, cytoplasm and vacuole

3. Absorption of ions into inner space is passive 

4. Maximum mineral absorption occurs through zone of cell elongation 

Denitrification is carried out by

1. Pseudomonas and Thiobacillus

2. Nitrosomonas and Anabaena 

3. Nitrobacter and Nostoc

4. Ferrobacillus and Thiobacillus