Biodiversity & Environmental Issues Test

Character of a stable community is that it
(a) should not show too much variations in year-to-year productivity
(b) must be resistant to occasional natural or man-made disturbances
(c) should be resistant to invasions by alien species
(d) all of these

Question 1/10

Clarias gariepinus

Nile perch

Climbing perch

Protopterus

Question 2/10

Fragmentation

Alien species invasion

Over-exploitation

Co-extinction

Question 3/10

should not show too much variations in year-to-year productivity

must be resistant to occasional natural or man-made disturbances

should be resistant to invasions by alien species

all of these

Question 4/10

(i) and (ii)

(i), (ii) and (iii)

(ii), (iii) and (iv)

(i), (ii), (iii) and (iv)

Question 5/10

Total number of species present on earth are considered to be about 7 million as estimated by Robert May.

Plants constitute more than 70% of all the species recorded, whereas animals constitute less than 22% of the total number of species.

Insects constitute more than 70% of all the animal species.

None of these.

Question 6/10

Mammals >Aves >Reptiles,>Amphibians

Aves >Reptiles >Mammals >Amphibians

Mammals >Reptiles >Amphibians >Aves

Reptiles >Amphibians >Mammals >Aves

Question 7/10

1.5 million

4.5 million

1.5 billion

4.5 billion

Question 8/10

increase

decreases

first increases then decreases

first decreases then increases

Question 9/10

3 million

5 million

7 million

9 million

Question 10/10

8

10

16

18