1. Which one of the following is a herbicide ?
(1) NAA (2) Kinetin
(3) 2-4-D (4) Zeatin
(5) Gamaxene
Ans: (3)
2. The following pigment is completely soluble in water :
(1) Oil a (2) Carotene
(3) Anthocyanin (4) Xanthophyll
(5) Phacocyanin
Ans: (3)
3. Activity of hydrolytic enzymes are induced by:
(1) Ethylene (2) Gibberellins
(3) Cytokinin (4) Auxins
(5) Abscisic Acid
Ans: (2)
4. Which amino acid of the following is the precursor of auxin biosynthesis ?
(1) Tryptophan (2) Histidine
(3) Phenylalanine (4) Cysteine
(5) Arginine
Ans: (1)
5. The crystal units of montmorillonite are held together by:
(1) O-O linkage (2) O-H linkage
(3) H-bonding (4) NH-bond
(5) Ester bonding
Ans: (1)
6. Which of the following characteristics helps in the identification of alkali soils?
(I) White/ash color layer of salts on soil surface
(2) Reddish color spot on soil surface
(3) Black spot on soil surface
(4) Yellow grains in the soil
(5) Brown particles in the soil
Ans: (3)
7. What amount of energy is released during the decomposition, of one gram of dried organic matter added to soil?
(1) 4-5 kilocalories (2) 8-10 kilocalories
(3) 16-20 kilocalories (4) 20-24 kilocalories
(5) 26-30 kilocalories
Ans: (2)
8. Which of the following soil texture is highly susceptible to crusting?
(1) Loam (2) Clay loam
(3) Silty clay (4) Silty clay loam
(5) Other than these options
Ans: (4)
9. Immobilization of nitrogen occurs when C:N ratio of organic matter is:
(1) < 20:1 (2) 20-30: 1
(3) > 30:1 (4) > 300:1
(5) Both (1) and (4)
Ans: (3)
10. The safest method to dispose of the waste materials is:
(1) Pouring in the river
(2) Pouring in the drain
(3) Burying in the soil
(4) Pouring in the pond
(5) Pack and throw into the sea
Ans: (3)
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