1. The pyramid which cannot be inverted in a stable ecosystem is that of

A. Biomass
B. Number
C. Energy
D. All the above
Answer :   Energy
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2. In a biotic community, the most important factor for survival of an animal is

A. day length
B. soil moisture
C. green food
D. predators
Answer :   green food
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3. Barophilic prokaryotes:

A. grow and multiply in very deep marine sediments
B. occur in water containing high concentrations of barium hydroxide
C. readily grow and divide in sea water enriched in any soluble salt of barium
D. grow slowly in highly alkaline frozen lakes at high altitudes
Answer :   grow and multiply in very deep marine sediments
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4. During ecological succession:

A. the establishment of a new biotic community is very fast in its primary phase
B. the numbers and types of animals remain constant
C. the changes lead to a community that is in near equilibrium with the environment and is called pioneer community
D. the gradual and predictable change in species composition occurs in a given area
Answer :   the gradual and predictable change in species composition occurs in a given area
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5. Which one of the following is not a function of an ecosystem?

A. Energy flow
B. Decomposition
C. Productivity
D. Stratification
Answer :   Stratification
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6. Pick up the correct food chain

A. Grass → Chamelion → Insect → Bird
B. Grass → Fox → Rabbit → Bird
C. Phytoplankton → Zooplankton → Fish
D. Fallen leaves → Bacteria → Insect larvae
Answer :   Phytoplankton → Zooplankton → Fish
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7. Upper part of sea/aquatic ecosystem contains

A. plankton
B. nekton
C. plankton and nekton
D. benthos
Answer :   plankton
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8. In an ecosystem the rate of production of organic matter during photosynthesis is termed as:

A. Gross primary productivity
B. Secondary productivity
C. Net productivity
D. Net primary productivity
Answer :   Gross primary productivity
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9. What type of ecological pyramid would be obtained with the following data?
Secondary consumer : 120 $$g$$
Primary consumer : 60 $$g$$
Primary producer : 10 $$g$$

A. Inverted pyramid of biomass
B. Pyramid of energy
C. Upright pyramid of biomass
D. Upright pyramid of numbers
Answer :   Inverted pyramid of biomass
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10. What is true of ecosystem?

A. Primary consumers are least dependent upon producers
B. Primary consumers out-number producers
C. Producers are more than primary consumers
D. Secondary consumers are the largest and most powerful
Answer :   Producers are more than primary consumers
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