All the factors of biosphere which affect the ability of organisms to survive and reproduce are called as _______________.

(a)

biological factors

(b)

abiotic factors

(c)

biotic factors

(d)

physical factors

Free living soil bacteria such as Pseudomonas sp are responsible for the ______________ process in the nitrogen cycle.

(a)

ammonification

(b)

nitrogen fixation

(c)

nitrification

(d)

denitrification

Increased amount of ___________ in the atmosphere, results in greenhouse effect and global warming

(a)

carbon monoxide

(b)

sulphur dioxide

(c)

nitrogen dioxide

(d)

carbon dioxide

In some xerophytes, leaves are modified into spines as an adaptation ________________.

(a)

to reduce transpiration rate

(b)

to store water

(c)

to reduce consumption of water

(d)

all of the above

Which of the following is one of the strategies to conserve water?

(a)

Water recycling

(b)

Increasing the number of bore wells

(c)

Using large overhead water tanks

(d)

Watering the plants using hose