Previous year UPSC prelims questions - Food Chain | Food Web (Environment)

1. Consider the following kinds of organisms:

Which of the above are primary producers in the food chains of oceans? [UPSC Civil Services Exam – 2021 Prelims]

1 and 2

2 and 3

3 and 4

1 and 4

2. Which one of the following is the correct sequence of a food chain? [UPSC Civil Services Exam – 2014 Prelims]

(a) Diatoms-Crustaceans-Herrings

(b) Crustaceans-Diatoms-Herrings

(d) Crustaceans-Herrings-Diatoms

3. With reference to the food chains in ecosystems, which of the following kinds of organism is/are known as decomposer organism/organisms?

Select the correct answer using the code given below: [UPSC Civil Services Exam – 2013 Prelims]

(a) 1 only

(b) 2 and 3 only

(d) 1, 2 and 3

4. With reference to food chains in ecosystems, consider the following statements:

A food chain illustrates the order in which a chain of organisms feed upon each other
Food chains are found within the populations of a species
A food chain illustrates the numbers of each organism which are eaten by others

Which of the statements given above is/are correct? [UPSC Civil Services Exam – 2013 Prelims]

(a) 1 only

(b) 1 and 2 only

(d) None

Previous year UPSC prelims questions – Food Chain | Food Web (Environment)