FC-CBSE-10-S-C13

Front

The two main components of an ecosystem are ______and ______.

Back

Biotic and Abiotic components.

Biotic components are living organisms (plants, animals). Abiotic components are non-living physical factors (air, water, soil).

Front

_______ form the base of every food chain.

Producers or Consumers

Back

Producers (Plants).

Producers (autotrophs) make their own food via photosynthesis and are the primary source of energy for all other organisms in the chain.

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Front

The major problem caused by the accumulation of pesticides like DDT in a food chain is ______

Eutrophication or Biomagnification

Back

Biological Magnification (Biomagnification).

Harmful chemicals become concentrated at higher trophic levels because they are not metabolized or excreted easily. Top consumers accumulate the highest doses.

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Front

The main man-made chemicals responsible for ozone layer depletion are known as ______

Back

Chlorofluorocarbons (CFCs).

CFCs (used in old refrigerators and aerosols) release chlorine atoms in the upper atmosphere, which destroy ozone molecules.

Front

Full form of CFC is____

Back

• Chloro Fluoro Carbon.

• These are compounds containing chlorine, fluorine, and carbon. They are very stable and can travel to the stratosphere where they cause ozone depletion.