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11.

A striking example of ______ is that of a ruminant animal such as a cow and the bacteria that live in its gut:

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

12.

A symbiotic association between fungus and roots of higher plants is known as:

A.	Lichen	B.	Mycorrhiza
C.	Mutualism	D.	None of these

13.

An association between a fungus and an alga is known as:

A.	Lichen	B.	Mycorrhiza
C.	Mutualism	D.	None of these

14.

The symbiotic association in which one partner gains benefit without benefiting or harming the other is known as:

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

15.

Barnacles attached to the backs of whales and turtles, get a free ride to better riding places, in an example of:

A.	Lichen	B.	Mutualism
C.	Commenalism	D.	Mycorrhiza

16.

The back and forth movements of chemical elements, between organisms and environment along characteristic circular paths and known as:

A.	Biochemical cycles	B.	Ecological cycles
C.	Chemical cycles	D.	None of these

17.

Which element is vital to plants and animals for the synthesis of proteins and nucleic acies?

A.	Oxygen	B.	Nitrogen
C.	Carbon	D.	None of these

18.

The earth's atmosphere contains over _____ % by volume of nitrogen gas:

A.	58	B.	68
C.	78	D.	None of these

19.

Nitrification takes place only in well aerated soils because the bacteria responsible for it are:

A.	Aerobic	B.	Anaerobic
C.	Parasites	D.	None of these

20.

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

A.	Food web	B.	Food chain
C.	Food cycle	D.	None of these