31.

Which of the following microbes produces nitrogen-fixing nodules in non-leguminous plants?

• Rhizobium

• Frankia

• Azotobacter

• Pseudomonas

• Pseudomonas

Splitting of water molecues during the light reaction of photosynthesis is associated  with

(a) PSI resulting in the release of O₂, Protons and transfer of electrons of PS II.

(b) PSII resulting in the release of O₂, Protons and transfer of electrons of PS I.

(c) PSII resulting in the release of O₂, Protons and transfer of electrons of PS II.

(d) PSI resulting in the release of O₂, Protons and transfer of electrons of PS I.

• (a) alone is correct

• (b) alone is correct

• (c) alone is correct

• (d) alone is correct

• (d) alone is correct

N₂ + 8e + 8H⁺ + 16ATP $\to$ 2NH₃ + H₂ + 16ADP + 16 Pi
The above equation refers to

• Nitrification

• Reductive amination

• Denitriofication

• Transamination

• Transamination

Match Column I with Column II and choose the right option

• A - 2; B - 4; C - 3; D - 1

• A - 2; B - 3; C - 4; D - 1

• A - 4; B - 1; C - 2; D - 3

• A - 4; B - 3; C - 1; D - 2

• A - 4; B - 3; C - 1; D - 2

Kranz anatomy is not seen in

(i) Maize

(ii) Sorghum

(iii) Tomato

• (i) and (ii) only

• (i) and (iii) only

• (i) only

• (ii) only

• (ii) only

In photorespiration, the number of ATP and NADPH synthesised are respectively

• 1 and 3

• 2 and 3

• 3 and 4

• 0 and 0

• 0 and 0

The respiratory quotient value of 0.7 is obtained for

• Anaerobic respiration

• Glucose

• Proteins

• Organic acids

• Organic acids

In which one of the following steps of citric and cycle FAD⁺
is reduced to FADH₂?

• Pyruvate $\to$ Acetyl coenzyme A

• Succinic acid $\to$ Malic acid

• Malic acid $\to$ Oxaloacetic acid

• Citric acid $\to$ $\mathrm{\alpha }$ – Ketoglutaric acid

• Citric acid $\to$ $\mathrm{\alpha }$ – Ketoglutaric acid

Horizontal growth of seedlings, swelling of the axis and apical hook formation in dicot seedlings is brought about by

• Auxins

• Gibberellins

• Ethylene

• Kinetin

• Kinetin

The cell derived from meristems differentiate and regain the capacity to divide by a phenomenon called

• Differentiation

• Dedifferentiation

• Redifferentiation

• Totipotency

• Totipotency