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Biodiversity and Conservation

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12

Crop plants grown in monoculture are

• low in yield

• free from intraspecific competition

• characterised by poor root system

• highly prone to pests

D.

highly prone to pests

Monoculture involves the exclusive cultivation of a single crop over wide areas. It is an efficient way to use certain kinds of soils but the crop plants grown in monoculture are highly prone to pests and thus, it carries the risk of an entire crop being destroyed with the appearance of a single pest species or disease.

Monoculture involves the exclusive cultivation of a single crop over wide areas. It is an efficient way to use certain kinds of soils but the crop plants grown in monoculture are highly prone to pests and thus, it carries the risk of an entire crop being destroyed with the appearance of a single pest species or disease.

446 Views

The number of national parks in India is :
• 56
• 66
• 90
• 448

C.

90
1323 Views

Number of Biosphere reserves in India is :
• 143
• 90
• 180
• 448

B.

90
987 Views

According to the IUCN (2004), the total number of plant and animal species described so far is slightly more than :
• 1.5 million
• 15 million
• 150 million
• 1500 million

A.

1.5 million
1066 Views

What are the species confined to a region and not found anywhere else called?
• Endangered
• extinct
• Sacred
• Endemic

D.

Endemic
916 Views

Animals constitute what % of the total species of organisms (plants and animals) recorded so far ?
• 7%
• 70%
• 17%
• 8%

B.

70%
781 Views