The ice sheets from the north and south poles and the icecaps on the mountains, get converted into water vapour through the process of ______________.

(a)

evaporation

(b)

condensation

(c)

sublimation

(d)

infiltration

The atmospheric carbon dioxide enters into the plants through the process of ______________.

(a)

photosynthesis

(b)

assimilation

(c)

respiration

(d)

decomposition

Which of the following is not an adaptation of hydrophytes?

(a)

poorly developed root system

(b)

reduced plant body

(c)

water storing parenchymatous tissues

(d)

finely divided submerged leaves

Identify the incorrect statement with respect to adaptations of earthworm.

(a)

Earthworm has a stream lined body with no antennae or fins.

(b)

Each segment of earthworm has setae.

(c)

Many earthworms become inactive in a process called hibernation, during winter season.

(d)

Earthworms remain in its burrow during day time, to avoid sunlight.

Specific constituents such as nitrogen, phosphorus, suspended solids and heavy metals found in the wastewater are removed during ___________ treatment of water recycling process.

(a)

primary

(b)

tertiary

(c)

secondary

(d)

none of the above

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

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