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231.

Ecosystem includes:

A.	A basic functional ecology unit including both biotic	B.	Abiotic component mutually adjusting with each other for the maintendance of life
C.	Both (a) & (b)	D.	None of these

232.

Components of ecosystem are:

A.	Abotic	B.	Biotic
C.	Both (a) & (b)	D.	None of these

233.

Abiotic components are:

A.	Inorganic	B.	Organic
C.	Climatic	D.	All of the above

234.

Biotic components are:

A.	Producers (Autotraphy)	B.	Macroconsumers (Hetrotrophs)
C.	Microconsumers (Seprotraphs/Decomposers)	D.	All of the above

235.

Non-biotic components can be grauped into:

A.	Lithosphere	B.	Hydrosphere
C.	Atmosphere	D.	All of the above

236.

Plant succession means:

A.	A change in the composition and nature of plant community of particular habitat over the years	B.	Any habitat can be studied systematically provided the area is free from any external disturbance
C.	Both (a) & (b)	D.	None of these

237.

Causes of plant succession are:

A.	Environmental changes produced as a result of reaction to the community become favorable for new species of plants	B.	Physiographic factors produce change in the habitat like flooding of plains, soil erosion, change in temperature, rain etc.
C.	Both (a) & (b)	D.	None of these

238.

Classification of plant succession categorised as:

A.	Primary succession	B.	Secondary succession
C.	Both (a) & (b)	D.	None of these

239.

Major types of climax are:

240.

Forest Ecosystem means:

A.	The produces in forest are actual at different strata from the ground level to the canopy of trees.	B.	The litter and consequently the humus layers is thick
C.	Both (a) & (b)	D.	None of these