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181.

Odum did not recognise the following relationship as a positive interaction:

A.	Commensalism	B.	Protoco-operation
C.	Mutualism	D.	Antibiosis

182.

The zone of soil showing microbial activity around the roots of higher plants is called:

A.	Rhizosphere	B.	Rhizoplane
C.	Soil microflora	D.	All of these

183.

The term symbiosis was proposed by:

A.	Mc Dougal	B.	Warming
C.	Odum	D.	de Bary

184.

The device or structure where plants are grown in a controlled environment:

A.	Culture chamber	B.	Inoculation chamber
C.	Phytotron	D.	All of these

185.

When one population is harmed and the other remains unaffected the relationship is called:

A.	Amensalism	B.	Predation
C.	Protoco-operation	D.	Parasitism

186.

Plants growing in oxygen deficient soils possess:

A.	No roots	B.	Longer roots system
C.	Aerial roots system	D.	Shallow root system

187.

The relationship between the alga Cladophora and the snail shell on which it grows corresponds to:

A.	Commensalism	B.	Predation
C.	Neutralism	D.	Mutualism

188.

The proto co-operation is also called:

A.	Non-obligatory mutualism	B.	Non-obligatory commensalism
C.	Facultative predation	D.	Facultative parasitism

189.

As a result of fire, there is destruction of the following components of soil:

A.	Litter	B.	Organisms
C.	Inorganic matter	D.	All of these

190.

The following relationship does not correspond to mutualism:

A.	Zoophily	B.	Zoochory
C.	Epiphytism	D.	Mycorrhiza