Agriculture Sciences - ICAR AIEEA (Agronomy & Soil Science)

Crop Production, Soil Fertility & Irrigation Management question bank (Agronomy, Crop Ecology & Soil Chemistry)

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Q1.

ICAR AIEEA Agronomy: In biological nitrogen fixation in 'Agronomy: Classification of Field Crops, Cropping Systems and Crop Rotations', which root nodule pigment acts as an oxygen scavenger to protect the oxygen-sensitive nitrogenase enzyme?

(A)

Leghaemoglobin (giving nodules a healthy pinkish-red interior) (Agronomy: Classification of Field Crops, Cropping Systems and Crop Rotations)

(B)

Chlorophyll a

(C)

Anthocyanin

(D)

Carotenoid

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Q2.

Soil Science (Clay Mineralogy): Which dominant expanding lattice 2:1 clay mineral imparts high swelling, deep cracking, and high Cation Exchange Capacity (CEC) to Indian Black Cotton soils (Vertisols) in 'Agronomy: Classification of Field Crops, Cropping Systems and Crop Rotations'?

(A)

Montmorillonite (Agronomy: Classification of Field Crops, Cropping Systems and Crop Rotations)

(B)

Kaolinite (1:1 non-expanding)

(C)

Illite (2:1 non-expanding)

(D)

Chlorite

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