The processes involved in the chemical weathering are:

A. Carbonation and oxidation
B. Hydrolysis and chelation
C. Hydrolysis and reduction
D. All of these

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

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

In submerged hydrophytes, functional stomata are found:

A. On upper surface of the leaf
B. Lower surface of the leaf
C. Both the surfaces of the leaf
D. Nowhere on the plant

The following show commensalisms:

A. Sea anemon, hermite crab
B. Bird and rhino
C. Butter fly and sunflower
D. Liver fluck and sheep

The storage capacity of a soil equals:

A. Field capacity
B. Field capacity less capillary water
C. Field capacity less hygroscopic water
D. Field capacity plus gravitational water

Which of the following is a short day plant?

A. Triticum
B. Lycopersicon
C. Gossypium
D. Nicotiana

More than 70% of world’s freshwater is contained in:

A. Polar ice
B. Greenland
C. Antarctica
D. Glaciers and Mountains

When one organism is benefited without affecting the other, it is called:

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

The annual population growth rate is Pakistan is the highest in the world, which is:

A. 1.50%
B. 1.80%
C. 1.90%
D. 1.10%

Which of the following is a submerged floating hydrophyte?

A. Tpha
B. Trapa
C. Potamogeton
D. Ceratophyllum