The ration of food energy assimilated to the food energy ingested is called:

A. Trophic level efficiency
B. Photosynthetic efficiency
C. Net production efficiency
D. Assimilation efficiency

In a stabilized ecosystem the P/R ratio is:

A. One
B. Less than one
C. More than one
D. Any of these

What is contributed from the outer space in an ecosystem?

A. All the atmospheric gases
B. Only carbon, hydrogen and oxygen
C. Energy only
D. All the above components

The snakes are included under:

A. Saprophytes
B. Primary consumers
C. Second trophic level
D. None of these

The pyramid of number in a forest ecosystem is:

A. Rhombiodal
B. Upright
C. Inverted
D. Linear

The factors to control of wind erosion are:

A. The soil should be kept moist as far as possible especially in the season of windstorms. Moist soil is less vulnerable to wind erosion than dry soil
B. Wind breaks by planting tree in rows or shelter belts of any means are effective in wind erosion
C. Both (a) & (b)
D. None of these

Hydrophytes (Aquatic Plants) means:

A. A reduction of the protective, conducting and supporting tissues
B. Absences of palisade tissue
C. Both (a) & (b)
D. None of these

What is coppice system?

A. A systems where the crop originates from coppice and where the rotation of the coppice is short.
B. A systems where the crop originates from coppice and where the rotation of the coppice is long.
C. Both (a) & (b)
D. None of these

The clear strip system is associated with:

A. Silvicultural system
B. Crop growth
C. Both (a) & (b)
D. None of these

Tip of ecological pyramid is occupied by:

A. Herbivores
B. Carnivores
C. Producers
D. Decomposers