Which of the following is not a reason of unnatural extinction of species?

Related Mcqs:

1. Which of the following marine form is more susceptible for extinction?

   A. Corals
   B. Gastropods
   C. Fishes
   D. Reptiles

2. A taxon facing high risk of extinction in the wild is identified as:

   A. Endangered
   B. Critically endangered
   C. Vulnerable
   D. None of these

3. Exotic species, which brought for plantation from some other country to our country or even from one ecosystem to other ecosystem are called, as exotic species like:

   A. Pinus nigra – Japan
   B. Euralyptus – Australia
   C. Polunia – China
   D. All of the above

4. The species characteristics are an expression of the genetic make up of an animal species influencing the extend and nature of ______.

   A. Home range, breeding season
   B. Longevity, territory and the niche
   C. Both (a) & (b)
   D. None of these

5. On the basis of genetic diversity, the following are differentiated with in a species:

   A. Ecads
   B. Ecotypes
   C. Populations
   D. Communities

6. A yield table for any species gives the following information on per acre basis for different site qualities and at various ages of crops:

   A. Age (5, 10, 15, 20 or 25 years)
   B. Main crop
   C. Thinning
   D. Final yield
   E. All of the above

7. Which of the following species are restricted to a given area?

   A. Endemic
   B. Sibling
   C. Allopatric
   D. Sympatric

8. The number of species in a single community is described as:

   A. Species diversity
   B. Alpha diversity
   C. Beta diversity
   D. Genetic diversity

9. Rhino has become a threated species on account of over exploitation for its:

   A. Skin
   B. Bones
   C. Horn
   D. Tusks

10. The approximate number of plant species, according to WCMC, that have become extinct in the last four centuries:

    A. 834
    B. 483
    C. 533
    D. 384