Your Progress 0 / 25 attempted
Q 01 / 25
Environment includes only living things around us.
Q 02 / 25
An ecosystem is a self-sustaining unit formed by interaction of biotic and abiotic components.
Q 03 / 25
Producers occupy the first trophic level in any food chain.
Q 04 / 25
Herbivores are primary consumers in a food chain.
Q 05 / 25
Decomposers are not part of the food chain, so they are unimportant for ecosystems.
Q 06 / 25
A food web is made up of many interconnected food chains in the same ecosystem.
Q 07 / 25
Trophic level means the number of organisms in a population.
Q 08 / 25
Energy flow in an ecosystem is cyclic, returning to the sun.
Q 09 / 25
Only about 10% of energy is transferred from one trophic level to the next higher level.
Q 10 / 25
Because of energy loss, food chains are usually limited to four or five trophic levels.
Q 11 / 25
Biodegradable wastes are easily broken down by microorganisms.
Q 12 / 25
Plastics and metals are good examples of biodegradable wastes.
Q 13 / 25
Non-biodegradable waste always remains harmless in the environment.
Q 14 / 25
Biological magnification means gradual increase in concentration of persistent pollutants along a food chain.
Q 15 / 25
In biomagnification, organisms at the producer level show the highest concentration of toxic chemicals.
Q 16 / 25
Ozone in the upper atmosphere protects life on Earth from harmful ultraviolet radiation.
Q 17 / 25
Chlorofluorocarbons (CFCs) released from old refrigerators and aerosols contribute to ozone layer depletion.
Q 18 / 25
Ozone is completely harmless at ground level.
Q 19 / 25
Managing garbage we produce mainly means mixing all waste and dumping it in open areas.
Q 20 / 25
The three R’s—Reduce, Reuse and Recycle—help in decreasing the amount of solid waste.
Q 21 / 25
Composting is a useful method for managing biodegradable household waste.
Q 22 / 25
Waste segregation at source makes recycling and treatment of garbage easier.
Q 23 / 25
All human activities only improve the environment and never harm it.
Q 24 / 25
Forests and ponds are examples of natural ecosystems, whereas crop fields and aquariums are artificial ecosystems.
Q 25 / 25
Decomposers act only on producers and never on consumers.
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ACADEMIA AETERNUM तमसो मा ज्योतिर्गमय · Est. 2025
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Biology | Biology Class 10
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