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61.

The most striking difference between tropical rain forests and temperate forests is that:

A.	The tropical rain forests have preponderance of angiosperms while the temperate ones have preponderance of gymnosperms	B.	The trees of temperate forests are taller than these of tropical rain forests
C.	Plants of temperate forests are comparatively more mesophytic	D.	Tropical forests are comparatively homogenous

62.

Among the plants listed, point out one that does not fit into ecological group represented by the other plants

A.	Acacia	B.	Aloe
C.	Euphorbia	D.	Rhizophora

63.

Biotic components consist of:

A.	Producers only	B.	Consumers only
C.	Decomposers only	D.	All of the above

64.

Soil salinity is measured by:

A.	Potometer	B.	Porometer
C.	Colorimeter	D.	Conductivity meter

65.

Symbiosis is beneficial to:

A.	The host	B.	The parasite
C.	Of mutual benefit	D.	Not beneficial

66.

Mycorrhiza is a symbiotic association between:

A.	Algae and fungi	B.	Algae and bryophytes
C.	Algae and roots of gymnosperms	D.	Fungi and roots of higher plants

67.

The zonels where no penetration of light occurs in a like:

A.	Littoral zone	B.	Limnetic zone
C.	Both (a) & (b)	D.	Profundal zone

68.

Which one of the following factors is biotic?

A.	Photoperiod	B.	CO2 content to the soil
C.	Texture and porosity of soil	D.	Rainfall

69.

The association of nodule bacteria with leguminous roots is known as:

A.	Saprophytism	B.	Symbiosis
C.	Epiphytism	D.	Parasitism

70.

The phenomenon of mimicry was first observed by:

A.	Bates	B.	Darwin
C.	Lamark	D.	Darlington