Plants constitute the:
A. Third trophic level
B. Fourth trophic level
C. First trophic level
D. Second trophic level
A man is the part of biotic community:
A. Always
B. Only when he lives in big cities
C. Only when he lives in forest
D. Never
Which of the following terms is not a synonym literally for ecosystem?
A. Ectosome
B. Ecosphere
C. Microcosm
D. Holocene
The term reducer is applied to:
A. Decomposers
B. Detritivores
C. Both (a) & (b)
D. Heterotrophs
The percentage of light energy utilized for photosynthesis by higher plants is:
A. 100
B. 50
C. 10
D. 1
The primary consumers are described as:
A. Herbivores
B. Converters
C. Transducers
D. All of these
The ecosystem lying in the alpine zone between taiga and polar ice is called:
A. Savana
B. Autotrophic
C. Heterotrophic
D. Tundra
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
According to Odum, the percentage of net primary production of total light intake is:
A. 10%
B. 0.15%
C. 1%
D. 1.50%
In a stabilized ecosystem the P/R ratio is:
A. One
B. Less than one
C. More than one
D. Any of these
Which of the following is the smallest unit?
A. Biosphere
B. Ecosphere
C. Ecosystem
D. Biome
In a parasitic food chain which trophic level is represented by bugs and lices?
A. T4
B. T3
C. T2
D. T1
The pyramid of number in a forest ecosystem is:
A. Rhombiodal
B. Upright
C. Inverted
D. Linear
The taiga ecosystems lie in the:
A. Alpine zone
B. Sub-alpine zone
C. Temperate zone
D. Sub-tropical zone
The pyramid of biomass in a shallow pond ecosystem is:
A. Inverted
B. Upright
C. Rhomboidal
D. Liver
The biotic and abiotic components of the ecosystem are connected through:
A. Standing quality
B. Climatic regime
C. Transducers
D. Humification and mineralization
The flow of materials and energy in an ecosystem is respectively:
A. Cyclic only
B. Cyclic and linear
C. Linear and cyclic
D. Linear only
The cybernetics of an ecosystem refers to:
A. Upright
B. Inverted
C. Rhomboidal
D. Linear
