Biodiversity & its conservation Practice Questions - DPP for NEET

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DPP /CB37
1. (a) In situ means keeping endangered species of animals or plants
into natural environment and not in the environment that
looks like natural but is man made, like zoological & botanical
gardens. In situ includes, national parks, sanctuaries and
biosphere reserve.
2. (d) Biodiversity Act of India was passed by the parliament in
the year 2002.
3. (b) Biodiversity is the number of variety of organism found
within a specified geographic region.
4. (d) The ‘Cheetah’ has become extinct from India. The endangered
subspecies Acinonyx jubatus venaticus lives in Asia (Iran). In
1990, there were reports in the Times of India of a cheetah
sighting in eastern India. There is a chance some cheetahs
remain in India, though it is doubtful. There have also been
reports of Asiatic cheetahs in the Balochistan Province of
Pakistan, though these continue to be unverified. The cheetah
prefers to live in an open biotope, such as semi-desert, prairie,
and thick bushes.
5. (d) Hot spots are those areas which were rich in biodiversity but
now are under threat due to direct or indirect interference of
human activites. These regions are on the edge to get some of
their species extinct due to humans. Western Ghats in India
are under threat due to continuous developmental activities
and Doon valley is under threat due to continuous mining
activities.
6. (b)
7. (d) Podophyllum is one of the endangered species of Indian
medicinal plants. It is used to remove benign (not cancer)
growths, such as certain kinds of warts. It works by
destroying the tissue
8. (a) Kaziranga National Park in Assam is famous as a protection
environmental park for rhinoceros.
9. (c) 10. (b)
11. (c) Lesser inter-specific competition is not observed in
biodiversity hotspots.
12. (b) In India maximum genetic diversity is seen in rice. Total of 23
variety of irrigated ecology and 8 varieties of rainfed ecology
has been invented in India.
13. (d) The statements (i) and (ii) are correct. The statement (iii) is
incorrect because predators cannot lead to the extinction of
prey species. Predator and prey evolve together. The
statement (iv) is incorrect because chemical such as nicotine
and strychnine produced by the plants are not metabolic
disorders but are metabolic wastes.
14. (b) Diversity is due to the long term evolutionary changes.
Adaptability to continuous changes in environmental
conditions is important for natural selection of variants and
variations generation after generation leading to emergence of
diverse descendants.
15. (d) Higher diversity in tropical areas is because (i) Speciation is
a function of time. Temperate areas have undergone frequent
glaciation in the past. It killed most of the species. No such
disturbances occured in tropics where species continuted to
flourish and evolve undisturbed for millions of years (ii)
There are no unfavouable seasons in tropics. Continued
favourable environment has helped tropical organisms to gain
more niche specialisation and increased diversity. (iii) More
solar energy is available in tropics. This promotes higher
productivity and increased biodivesity. (iv) Resoruce
availability is higher in tropics (v) There is reduced
competition in tropics due to favourable environment. (vi)
Rate of extinction is low in tropics.
16. (b) Lantana, Eichhornia and Arican catfish are exotic species.
Non-native or exotic species are often introduced
inadvertently for their economic and other uses. They often
become invasive and drive away the local species. These
species are considered to be second major cause of extinction
of species. Exotic species have proved harmful to both aquatic
and terrestrial ecosystems.
17. (d) A stable community is self-prepetuating and final biotic
community that is in perfect harmony with the physical