474. The method of simultaneous integration of trees with agricultural crops is called

A. Agro forestry
B. Deforestation
C. Reforestation
D. Combined culture
✅ The correct answer is option A.
Agroforestry is the integration of trees and shrubs with open-space agriculture allowing simultaneous, multi-use purposes. Agroforestry is a worldwide practice since the dawn of farming.

475. Low clouds retard surface cooling at night better than clear skies because:

A. The clouds absorb and radiate infrared energy back to earth
B. The water droplets in the clouds reflect infrared energy back to earth
C. The clouds start convection currents between them
D. The clouds are better conductors of heat than is the clear night air
✅ The correct answer is option A.
Low clouds retard surface cooling at night better than clear skies because the clouds absorb and radiate infrared energy back to earth.

480. Autecology deals with

A. Ecology of species
B. Ecology of many species
C. Ecology of community
D. All the above
✅ The correct answer is option A.
Autecology is primarily experimental and deals with easily measured variables such as light, humidity, and available nutrients in an effort to understand the needs, life history, and behaviour of the organism or species.