Which is not a greenhouse gas?

(a)

CO₂

(b)

N₂O

(c)

O₃

(d)

CFC

The total ozone layer over the earth surface is ____________________

(a)

30 DU

(b)

300 DU

(c)

3000 DU

(d)

0.3 DU

Pick out the odd one out _____________

(a)

Biosphere reserve

(b)

National parks

(c)

Wild life sanctuaries

(d)

Botanical gardens

Assertion (A): Social forestry refers to management of forests and afforestation on barren lands.
Reason (R): Afforestation involves the cutting of trees.

(a)

A is correct R is incorrect.

(b)

A is incorrect R is correct.

(c)

R explains A.

(d)

Both A and R are incorrect.

Assertion (A): In zoological parks, the animals are maintained in their natural habitat.
Reason (R): Ex-situ conservation refers to protecting species in their natural habitat.

(a)

A is correct R is incorrect.

(b)

A is incorrect R is correct.

(c)

R explains A.

(d)

Both A and R are incorrect.