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271.

In which one of the following pairs is the specific characteristic of a soil not correctly matched?

A.	Terra rossa - Most suitable for roses	B.	Chernozems - Richest soil in the world
C.	Black soil - Rich in clacium carbonate	D.	Laterite - Contains aluminium compound

272.

Stratification occurs in:

A.	Desert	B.	Tropical forest
C.	Deciduous forest	D.	Tundra

273.

The chemical produced by the host plant to protect themselves against fungal infection is:

A.	Toxin	B.	Hormone
C.	Phytotoxin	D.	Phytoalexin

274.

In submerged hydrophytes entry of CO2 is through:

A.	Epidermis as dissolved CO2	B.	Epidermis as carbonates only
C.	Epidermis as carbonates only	D.	Both (b) and (c)

275.

Plants adapted to low light intensity have:

A.	Higher rate of CO2 fixation than the sun plants	B.	More extended root system
C.	Leaves modified to spines	D.	Larger photosynthetic unit size than the sun plants