Non-lonizing radiations with specific biological effects are ________________.
A. Gamma rays
B. Beta-rays
C. UV radiations
D. X-rays
Author: Aroma Ann
In the Northern Hemisphere, this day has the fewest hours of daylight ________________.
A. Summer solstice
B. Winter solstice
C. Vernal equinox
D. Autumnal equinox
Coral reefs in India can be seen in ________________.
A. Himalayan region
B. Andaman and Nicobar Islands
C. Uttarpradesh
D. Maharashtra
Many freshwater animals cannot live for long in sea water and vice versa mainly because of the ________________.
A. Change in N levels
B. Change in the levels of thermal tolerance
C. Variations in light intensity
D. Osmotic problems
E. Spectral quality of solar radiation
Minute particles and liquid droplets are collectively called ________________.
A. Convection current
B. Ozone
C. UV radiation
D. Aerosols
The most harmful of ultraviolet radiations are ________________.
A. UV-C,
B. UV-B,
C. UV-A,
D. All the above.
Which of the following enhances soil fertility?
A. Crop rotation
B. Improved methods of agriculture
C. Using new seed varieties
D. Irrigation
What is the most important factor for the success of animal population?
A. Natality
B. Adaptability
C. Unlimited food
D. Inter species activity
Carbon dioxide is called green-house gas because it is ________________.
A. Transparent to sunlight but traps heat
B. Transparent to heat but traps sunlight
C. Used in green-house to increase plant growth
D. Transparent to both sunlight and heat
What is UNCED?
A. United Nations Conference on Education,
B. United Nations Conference on Environmental Day
C. United Nations Conference on Environment and Development
D. None of these
