Given below are two statements. Statement I: There is less species biodiversity in tropical latitudes than in temperate region Statement II: Tropical environments unlike temperate ones are less seasonal, relatively more constant and predictable. In the light of the above statements, choose the correct answer from the options given below.
Statement I is false, but Statement II is true
Species diversity follows a latitudinal gradient: it generally decreases as we move away from the equator towards the poles. NCERT notes, for example, that Colombia near the equator has nearly 1,400 bird species, New York at 41° N about 105 and Greenland at 71° N only 56.
Statement I: There is less species biodiversity in tropical latitudes than in temperate region — false; the tropics (23.5° N to 23.5° S) harbour more species than temperate or polar areas.
Statement II: Tropical environments, unlike temperate ones, are less seasonal, relatively more constant and predictable — true; NCERT gives this as one of the hypotheses explaining greater tropical diversity, since such constant environments promote niche specialisation.
With Statement I false and Statement II true, the choices calling both true, both false, or Statement I true do not fit.
Statement I is false, but Statement II is true option is correct.
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Important Questions from Ecology
- Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : Abingdon tortoise in Galapagos islands became extinct within a decade after goats were introduced.
Reason R : Goats were more efficient at browsing than Abingdon tortoise.
In the light of the above statements, choose the most appropriate answer from the options given below : - Which of the following statements are correct ?
(a) Energy flow from producers to consumers is unidirectional
(b) Energy pyramid can never be inverted
(c) Transfer of energy follows the 1% law
Choose the correct answer from the options given below : - Arrange the following in descending order of number of species in the Amazonian rain forest.
(a) Plants
(b) Birds
(c) Fishes
(d) Invertebrates
(e) Mammals
Choose the correct answer from the options given below : - Match List-I with List-II.
List-I List-II A. Both species are harmed I. Predation B. One species is harmed and the other is benefited II. Mutualism C. Both species are benefited III. Competition D. One is benefited while the other has no effect IV. Commensalism
Choose the correct answer from the options given below : - Which of the following are primary consumers in a food chain ?
