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A bacterium found in the root nodules of leguminous plants is the:

A.	Clostridium	B.	Azotobacter
C.	Nitrobacter	D.	Rhizobium

Conservator of Forsts looks after proper management of a:

A.	Forest circle	B.	Working circle
C.	Forest compartment	D.	Felling series

The bacteria, which reduce nitrates in the soil to gaseous nitrogen, are known as denitrifying bacteria such as:

A.	Nitromonas	B.	Pseudomonas
C.	Nostoc	D.	Rhizobium

Removal of top soil by soil erosion result in the loss of soil:

A.	Nitrites	B.	Nitrates
C.	Nitrogen	D.	Nitric and nitrous acids

The transfer of food energy from the sources in plants through a series of organisms with repeated stages of eating and being eaten is known as:

A.	Food way	B.	Food web
C.	Food link	D.	Food chain

Short and simple food chains are rare in the world and may be found in simple ecosystems like:

A.	Savanna	B.	Tundra
C.	Grassland	D.	Desert

An animal which captures and readily kills live animals for its food is known as:

A.	Predator	B.	Parasite
C.	Symbionts	D.	None of these

Desertification is:

A.	Spread of the desert	B.	Control of the desert
C.	Use of the desert for good of mankind	D.	None of these

An association between two organisms belonging to different species, which live together for mutual benefit or on partner gets benefit and other, is neither benefited nor harmed is known as:

A.	Predation	B.	Parasitism
C.	Symbiosis	D.	None of these

10.

Symbiotic association in which both the partners get benefit and neither cansurvive without the other is called:

A.	Mutualism	B.	Commensalism
C.	Parasitism	D.	None of these