How much percentage of Nitrogen consist in Earth's atmosphere?

(a)

25%

(b)

12%

(c)

92%

(d)

78%

Deforestation generally decrease ______________.

(a)

Rainfall

(b)

Global warming

(c)

Soil erosion

(d)

Drought

World water day is celebrated every year on ____________.

(a)

August 12

(b)

22^nd March

(c)

June 5

(d)

July 10

Biotic components include _______________.

(a)

All living organism

(b)

Light, temperature etc.

(c)

Water, mineral and gases

(d)

Self nourishing green plants

Which part of plant consisting Nitrogen fixing bacteria?

(a)

Roots

(b)

Stems

(c)

Leaves

(d)

All the above

The amount of CO₂ present in the atmospheric air is _______________.

(a)

0.318%

(b)

0.383%

(c)

21%

(d)

78%

Which cycie involves transpiration?

(a)

Water cycle

(b)

Nitrogen cycle

(c)

Carbon cycle

(d)

All the above

List some of the ways in which you could save water in your home and school?

What is the function of the bacteria Rhizobium? Where does it occur?

How do human activities affect carbon cycle?

List out some adaptations of Mesophytes.

What is the theme of word water day what does it mean?

What do you mean by conservation of water?

List out the advantages of farm ponds.

Give some of the strategies to support water conservation.

What is the role played by the earthworms to improve the soil fertility? How does it adapt to light and temperature.