UPSC Prelims 2019 · GS Paper I
Question 28: Environment and Ecology
Consider the following statements :
- 1.Some species of turtles are herbivores.
- 2.Some species of fish are herbivores.
- 3.Some species of marine mammals are herbivores.
- 4.Some species of snakes are viviparous.
Which of the statements given above are correct?
AnswerUPSC’s answer is (d).
All four statements are correct. Green sea turtles and many freshwater turtles are largely herbivorous. Fish such as parrotfish and grass carp feed on algae and plants. Dugongs and manatees are marine mammals that eat seagrass and aquatic plants. Many snakes, including sea snakes, boas and several vipers, are viviparous and give birth to live young instead of laying eggs.
- 1. Green sea turtles and some freshwater turtles are herbivores.
- 2. Parrotfish and grass carp eat plants and algae.
- 3. Dugongs and manatees are herbivorous marine mammals.
- 4. Sea snakes, boas and several vipers give birth to live young.
How you could have got this
- If you were sure statement 1 is correct, (b) and (c) go: each of them leaves 1 out.
What you needed to know: Green sea turtles and some freshwater turtles are herbivores.
- Then, if you were sure statement 2 is correct, (a) goes: it leaves 2 out.
What you needed to know: Parrotfish and grass carp eat plants and algae.
Only (d) is left. You didn’t need statements 3 or 4.
Which options go is worked out from UPSC’s key and the options, not by a model.
Why each option is right or wrong
- (a) Statements 2 and 4 are also correct.
- (b) Statement 1 is also correct.
- (c) Statements 1 and 3 are also correct.
- (d) Correct: all four statements hold.
Answer: UPSC’s key. Explanation: written by UPSC Grade, not by UPSC.
Source: UPSC, Civil Services (Preliminary) Examination 2019, General Studies Paper I, Series A. The paper on upsc.gov.in.