Biodiversity and Its Conservation

The total number of species present on the earth varies from _ to _ million and averages _ million

• 5,50,14

• 10,100,28

• 40,14,5

• 70,100,200

Out of the total number of species, only ___ % are known and described

• 15

• 12

• 50

• 70

How many plants are known till date?How many plant species are there in India?

• 2,50,000.45,000

• 2,60,000.46.000

• 2,70,000,47,000

• 2,80,000.48,000

How many insects are there in the earth?

• 10,25,000

• 11,26,000

• 12,27,000

• 13,38,000

1)Biodiversity is the source of -

⋅ food

⋅medicines

⋅fibres

⋅timber

⋅rubber etc

2)The threats to biodiversity are-

⋅Deforestation

⋅Destruction of natural habitat

⋅Habitat Fragmentation, Degradation and pollution

⋅Introduction to exotic species

⋅Overexploitation etc

• True

• False

Why is the diversity of organisms necessary?

• i)to maintain a healthy atmosphere

• ii)to maintain a healthy life

• iii)to live peacefully

• iv)None of these

The increasing demands of the rising human population have resulted in _____

• i)destruction of habitats

• ii)degradation of the environment

• iii)loss of biodiversity

• iv)All of these

Around the globe,____ that took millions of years to develop are being destroyed by human activities

• i)Physical communities

• ii)Chemical communities

• iii)Biological communities

• iv)None of these

⋅_____ is defined as the worldwide death and disappearance of a specific organisms or a group of organisms.

⋅It is the most serious aspect of the loss of biodiversity.

⋅It has disturbed the ecological balance and the entire biotic community.

⋅____ is a group of closely related, interbreeding organisms.

The causes of destruction of natural habitat are-

⋅House, Dam and Road construction

⋅Setting up of industries

⋅Cutting of trees for timber and fuel wood

⋅Overgrazing by cattle

• True

• False