📣 Paper 3 has been removed from NET from 2018 (Notification)- now paper 2 and 3 syllabus is included in paper 2. Practice both paper 2 and 3 from past papers.

NTA NET Environmental Science Paper 3 November 2017 Higher Questions and Answers Part 2

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12. In the context of argentometric titration of chloride ions in a water sample, identify the incorrect statement:

(1) Titrant is silver nitrate solution

(2) Indicator is potassium chromate

(3) Color of the end - point is lemon - yellow

(4) pH of water sample should be less than 5

Answer: (4) pH of water sample should be less than 5

Q 13. The reaction of OH radicals with which of the following species generates hydrogen atom?

(1)

(2)

(3)

(4)

Answer: (3) CO

Q 14. Which of the following statements is true for an ideal dilute solution?

(1) Solute and solvent both obey Raoult՚s law

(2) Solute obeys Raoult՚s law and solvent obeys Henry՚s law

(3) Solute obeys Henry՚s law and solvent obeys Raoult՚s law

(4) Solute and solvent both obey Henry՚s law

Answer: (3) Solute obeys Henry՚s law and solvent obeys Raoult՚s law

Q 15. Given below are two statements. One labelled as Assertion (A) and the other labelled as Reason (R) :

Assertion (A) : The living components of ecosystems are not immortal.

Reason (R) : Depending on the biological longevity, all living systems become abiotic constituents.

Choose the correct answer:

(1) Both (A) and (R) are correct and (R) is the correct explanation of (A) .

(2) Both (A) and (R) are correct and (R) is not the correct explanation of (A) .

(3) (A) is true, but (R) is false.

(4) (A) is false and (R) is true.

Answer: (1) Both (A) and (R) are correct and (R) is the correct explanation of (A) .

Q 16. The movement of energy from primary producers to consumers is effected by:

(1) The process of eating

(2) The rate of rainfall

(3) The rate of evaporation

(4) The rate of transpiration

Answer: (1) The process of eating

Q 17. The result of removal of primary producers and subsequent reduction in population size leading to change in community attributes is referred to as:

(1) Top - down cascade

(2) Bottom - up cascade

(3) Population decline

(4) Community collapse

Answer: (1) Top - down cascade

Q 18. The amount of accumulated dead organic matter in different forest types:

(1) Decreases from pole to equator.

(2) Increases from tropic of cancer to tropic of Capricorn.

(3) Increases from pole to equator.

(4) Stabilizes at any point between two poles.

Answer: (1) Decreases from pole to equator.

Q 19. Which one of the following termite gut microbe contributes to degradation of cellulose?

(1) Trichonympha sp.

(2) E

(3) Enterobacter sp.

(4) Citrobacter sp.

Answer: (1) Trichonympha sp.

Q 20. Match the List - I and List - II. Identify the correct answer from the code given below:

Match the List - I and List - II. Identify the Correct Answer from the Code Given belowMatch the List - I and List - II. Identify the Correct Answer from the Code Given Below
List - IList – II
(a) Macroplankton(i) Rotifera
(b) Nanoplankton(ii) Copepoda
(c) Mesoplankton(iii) Pyrrophyta
(d) Microplankton(iv) Amphipoda

(1) (iii) (iv) (i) (ii)

(2) (ii) (i) (iv) (iii)

(3) (i) (ii) (iii) (iv)

(4) (iv) (iii) (ii) (i)

Answer: 4

Q 21. The size of the Femtoplankton is in the range:

(1)

(2)

(3)

(4)

Answer: (2)

Q 22. As of July 2017, the total number of National Parks existing in India is:

(1) 127

(2) 103

(3) 97

(4) 100

Answer: (2) 103