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21.

Soil that is made-up of particles, that have been carried in water and thus deposited, is called:

A.	Silt	B.	Clay
C.	Sub-soil	D.	Loam

22.

The soil organisms are:

A.	Harmful to the plants growing in the soil	B.	Useful to plants growing in the soil
C.	Neither harmful nor useful to plants growing in the soil	D.	Both harmful as well as useful to plants growing on the soil

23.

The soils that are fully laden with water i.e., water logged, are known are:

A.	Physically dry soils	B.	Physiologically dry soils
C.	Alkaline soils	D.	Acidic soils

24.

Hydrilla is a:

A.	Free floating hydrophyte	B.	Submerged hydrophyte
C.	Suspended hydrophyte	D.	Floating and anchored hydrophyte

25.

The water held tightly in a thin film by te soil particles is known as:

A.	Run away water	B.	Hygroscopic water
C.	Capillary water	D.	Gravitational water

26.

Thick cuticles on leaves are typical of plants growing in:

A.	Wet habitats	B.	Warm habitats
C.	Dry habitats	D.	Cool habitats

27.

Sunken stomata are found in the leaves of:

A.	Nelumbium	B.	Hydrilla
C.	Mango	D.	Nerium

28.

Plants growing in extreme cold soil are:

A.	Oxylophytes	B.	Halophytes
C.	Psychrophytes	D.	Psammophytes

29.

Which of the following is not the characteristic feature of the anatomy of xerophytes?

A.	Spongy paraenchyma	B.	Well developed conducting tissue
C.	Well developed mechanical tissue	D.	Thick cuticle

30.

The plankton is:

A.	Red slgae	B.	Floating fauna
C.	Passively floating or drifting flora of micro-organisms	D.	A layer of organic matter