Biodiversity & ...

Which one of the following fish is being illegally introduced for aquaculture purposes and is posing a threat to the indigenous catfishes of Indian rivers?

When a species becomes extinct, the plant and animal species associated with it in an obligatory way also become extinct. This phenomenon is referred to as

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

Which of the following statements describe natural extinction?
(i) Extinctions abetted by human activities
(ii) Slow replacement of existing species
(iii) Also known as background extinction
(iv) A small population is most likely to be extinct

Which of the following statements regarding the estimates of number of species found on earth is not correct?

What is the decreasing order of the number of animals species as far as India is concerned?

How many plant and animal species have been discovered and described so far?

Species diversity______as one moves from high to low altitudes.

What is the total number of species present on earth as estimated by Robert May?

India is one of the 12 megadiversity countries of the world and is being divided into______biogeographical regions.