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41.

Plants absorb from the soil

A.	Hygroscopic water	B.	Gravitational water
C.	Capillary water	D.	Hygroscopic and gravitational water

42.

Percentage of water left in the soil when a plant wilts is known as:

A.	Turgidity	B.	Wilting coefficient
C.	Field capacity	D.	Water retaining power of the soil

43.

Deserts plants have longer root system because:

A.	High temperature of woil encourages root growth	B.	Low temperature at night encourages root growth
C.	Those plants adapted to produce long system can survive better in desert	D.	Roots grow in search of water

44.

The stems of submerged water plant are soft and weak because:

A.	They are absolutely devoid of xylem	B.	They totally lack phloem
C.	They do not have stomata	D.	The supporting tissues and xylem are feebly developed

45.

Plants growing near sea shore will usually have xerophytic characters, like thick leaves, because:

A.	There is planty of water in the soil	B.	There is too high a concentration of salts for the plants to absorb sufficient water from the soil
C.	Light available to plant is not sufficient	D.	The soil is muddy

46.

Plants are killed in winter by frost:

A.	Because there is no transpiration	B.	Because respiration ceases at such a low temperature
C.	Because no photosynthesis takes place at such a low temperature	D.	Because of desiccation and mechanical damage to the tissues

47.

The plant that has a characteristic component of the mangrove vegetation is:

A.	Rhizophora mangle	B.	Ficus religiosa
C.	Mangifera indica	D.	Prosopis specigera

48.

Mucilagenous tissue and chlorenchymatous cortex are characteristic of:

A.	Epiphytes	B.	Insectivorous plants
C.	Halophytes	D.	Mesophytes

49.

Area where two communities overlap each other:

50.

Alpine forests occur at an altitude:

A.	3,900-6,000 m	B.	1,900-3,000 m
C.	1,000-1,5000 m	D.	500-1,000 m