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9. Which among the following is not considered as a complementary interaction in
sequential cropping systems ?
A) Sorghum effect B) Cotton effect
C) Legume effect D) AandB

10. The quantity of urea required for top dressing in Sreyas variety of transplanted rice,
cultivated in 2.5 acres is
A) 51 kg B) 76 kg ©) 65 kg 0) 98 kg

11. Ina soil profile, A and B horizons combinedly is called as
A) Solum B) Pedon C) Regolith D) Bedrock

12. Identify the incorrect statement pertaining to soil and soil formation.
A) Soil formation includes formation of regolith by weathering and soil profile
development.
B) Weathering refers to disintegration and decomposition of rocks and minerals.
C) Soil is a two - dimensional natural body.
D) Pedon is the smallest volume that can be called a soil.

13. Identify the incorrect statement regarding soil colloids.
A) Inorganic clay and organic humus particles are collectively referred as colloidal
fraction.
B) Particles having less than 1-2 um in diameter behave as colloids.
C) Organic colloids have higher CEC than inorganic colloids.
D) Swelling and shrinkage is characteristic of 1:1 Kaolinite type of clay mineral.

14. The soil consistency where the soil water mass just flows under an applied force and
fails to retain shape is called

A) Upper plastic limit B) Lower plastic limit

C) Plasticity index D) Plasticity number
15. Which of the following is not correctly matched ?

A) Symbiotic N fixing bacteria — Rhizobium

8) Non-symbiotic N fixing bacteria - Clostridium

C) Cyanobacteria - Frankia

D) Autotrophic bacteria - Nitrosomonas
16. The acid sulphate soils of Kerala are called as

A) Karappadam lands B) Kari lands

C) Kayal lands D) Kole lands