NEET Biology Biodiversity conservation Objective Questions,Solutions,mcq

Biodiversity and Conservation Mock Exam-4

Question No:1

Since the origin and diversification of life on earth how many episodes of mass extinction of species have occurred till date?

[A] 2
[B] 3
[C] 4
[D] 5

Question No:2

The current rate of species extinction is how many times faster than the pre-human time?

[A] 10 to 50 times
[B] 100 to 1000 times
[C] 1000 to 10,000 times
[D] 10,000 to 1,00,000 times

Question No:3

Find the incorrect statement.

[A] ‘Sixth extinction’ is different from previous extinction in terms of rate of extinction.
[B] Ecologist warn that if the present trend of extinction continues, nearly 50% all species on earth might be wiped out within the next 100 years.
[C] Amphibians appear to be vulnerable to extinction.
[D] Recent extinction is completely natural.

Question No:4

Loss of biodiversity in a region may lead to

[A] Decline in plants production
[B] Lowered resistance to environmental perturbations such as draught.
[C] Increased variability in certain ecosystem processes such as plant productivity, water use, and pest and disease cycle.
[D] All of the above

Question No:5

Which of the following is major cause of loss of biodiversity?

[A] Habitat loss and fragmentation
[B] Over-exploitation
[C] Alien species invasion
[D] Co-extinction

Question No:6

Most dramatic examples of habitat loss comes from the

[A] Tropical rain forests
[B] Temperate forests
[C] Grasslands
[D] Deserts

Question No:7

Find the incorrect statement from the following.
(A) Tropic rain forests cover around 6% of earth’s land surface.
(B) Amazonian rain forest is being cut and cleared for soya bean cultivation or for conversion to grasslands for raising beef cattle.
(C) Animals with migratory habits are badly affected by habitat loss and fragmentation.
(D) Mammals and birds require small territories.

[A] A and B only
[B] A and D only
[C] D only
[D] B and C only

Question No:8

Steller’s sea cow and Passenger pigeon became extinct due to

[A] Alien species invasion
[B] Co-extinction
[C] Habitat loss and fragmentation
[D] Over exploitation

Question No:9

Which of these are examples of alien species invasion?

[A] Nile perch introduced in Lake Victoria in east Africa
[B] African catfish in Indian River
[C] Water hyacinth in India
[D] All of the above

Question No:10

Which of these are invasive weeds?

[A] Carrot grass (Parthenium)
[B] Gandhari (lantana)
[C] Water hyacinth (Eicchornia)
[D] All of the above

Question No:11

Co-extinction means

[A] Introduction of alien species leading to decline or extinction of indigenous species
[B] Extinction due to over exploitation
[C] Extinction due to Habitat loss
[D] Extinction due to obligatory association of plant or animal

Question No:12

Which of these is not a narrowly utilitarian argument for conserving biodiversity?

[A] Food
[B] Medicine
[C] Construction material
[D] Pollination

Question No:13

All are examples of broadly utilitarian except

[A] Pollination
[B] Oxygen
[C] Aesthetic pleasure of walking through thick woods
[D] Firewood

Question No:14

Find the incorrect statement from the following.

[A] Introduction of Nile perch in Lake Victoria in east Africa lead to extinction of more than 200 species of cichlid fish in the lake.
[B] Fast dwindling Amazon forest is estimated to produce, through photosynthesis, 20% of the total oxygen in the earth’s atmosphere.
[C] More than 25% of drugs currently sold worldwide are derived from plants.
[D] Illegal introduction of American catfish Clarias gariepinus for aquaculture purpose is posing threat to indigenous cat fishes in our rivers.