CUET PG PYQs for Ecology and Ecosystem with Solutions: Practice CUET PG Previous Year Questions

Content Writer | Journalism Graduate | Updated 3+ months ago

Ecology and Ecosystem is an important topic in the Environmental Studies section in CUET PG exam. Practising this topic will increase your score overall and make your conceptual grip on CUET PG exam stronger.

This article gives you a full set of CUET PG PYQs for Ecology and Ecosystem with explanations for effective preparation. Practice of CUET PG Environmental Studies PYQs including Ecology and Ecosystem questions regularly will improve accuracy, speed, and confidence in the CUET PG 2026 exam.

CUET PG PYQs for Ecology and Ecosystem with Solutions

1.
El Nino and La Nina phenomena are observed in-
- Pacific Ocean
- Indian Ocean
- Mediterranian Sea
- Atlantic Ocean
View Solution
2.
A planet having 300 K average surface temperature will emit maximum radiation in
- Ultra violet region
- Visible region
- Infrared region
- Microwave region
View Solution
3.
Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R):
Assertion (A): The average composition of atmosphere near the surface of earth is given on dry basis and in terms of mixing ratio (weight percent basis).
Reasons (R): Water content in atmosphere near the surface of the earth is variable with respect to location, time and the concentration of gases in volumetric units (moles/litre) varies with temperature and pressure conditions.
In the light of the above Statements, choose the correct answer from the options given below:
- Both (A) and (R) are true and (R) is the correct explanation of (A)
- Both (A) and (R) are true but (R) is NOT the correct explanation of (A)
- (A) is true but (R) is false
- (A) is false but (R) is true
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4.
Which of the following metal is used in wood preservatives ?
- Mercury
- Lead
- Arsenic
- Selenium
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5.
Given below are two statements:
Statement I: Plant roots are surrounded by microorganisms as part of soil-plant-microbe ecosystem which can be termed as the rhizosphere.
Statement II: Root exudates have no effect on Rhizosphere ecology.
In the light of the above statements, choose the most appropriate answer from the options given below:
- Both Statement I and Statement II are correct
- Both Statement I and Statement II are incorrect
- Statement I is correct but Statement II is incorrect
- Statement I is incorrect but Statement II is correct
View Solution
6.
A population of genetically identical cells sharing a particular resources within an ecological riche is called -
- Prototype
- Ecotype
- Serotype
- Genotype
View Solution
7.
Given below are two statements:
Statement I: Los Angeles smog event was a suitable example of photochemical smog.
Statement II: Photochemical smog formation requires NOx, volatile organic compounds and intense sun light in which peroxy acetyl nitrate is one of the byproducts.
In the light of the above statements, choose the most appropriate answer from the options given below:
- Both Statement I and Statement II are correct
- Both Statement I and Statement II are incorrect
- Statement I is correct but Statement II is incorrect
- Statement I is incorrect but Statement II is correct
View Solution
8.
Noise levels in environment are measured in
- Dobson unit
- Decibel unit
- Grambel unit
- Hertz unit
View Solution
9.
Choose the incorrect statement about Acid Rain.
- Acid rain is primarily caused by NO₂ and SO₂
- Acid rain is responsible for defacing of monuments
- Acid rain have no impact on soil fertility
- Rain water with pH of less than 5-6 is referred as acid rain
View Solution
10.
The high impact species whose removal from community affects persistence of other species, and their impact is disproportionate to abundance are known as ______.
- Umbrella species
- Flagship species
- Exotic species
- Keystone species
View Solution
11.
Match List I with List II
LIST I
(Biographic Zone) LIST II
(Biotic Provinces)
A. Himalayan I. Kutch
B. Desert II. North West Himalaya
C. Semi Arid III. Punjab
D. Western Ghats IV. Malabar Coast
Choose the correct answer from the options given below:
- (A)-(I), (B)-(II), (C)-(III), (D)-(IV)
- (A)-(II), (B)-(I), (C)-(III), (D)-(IV)
- (A)-(IV), (B)-(III), (C)-(II), (D)-(I)
- (A)-(II), (B)-(IV), (C)-(I), (D)-(III)
View Solution
12.
Which one of the following is true about the sporophyte of Riccia ?
- It has well-developed foot, seta and capsule
- It posseses the pseudoelaters
- It lacks foot seta and claters and embedded in the gametophyte
- It does not depend on the gametophyte for nutrition and survive independently
View Solution
13.
Who among the following developed the Gaia Hypothesis ?
- E. S. Rowland
- Mario Moling
- James E. Lovelock
- William Golding
View Solution
14.
Catalytic convertors in vehicle are used for -
- Oxidation of CO and NO
- Reduction of CO and NO
- Oxidation of CO and reduction of NO
- Reduction of CO and oxidation of NO
View Solution
15.
What will be the concentration of nitrogen (N) in a 31 ppm solution of nitrate?
- 31 ppm
- 7 ppm
- 14 ppm
- 28 ppm
View Solution

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	LIST I (Biographic Zone)		LIST II (Biotic Provinces)
A.	Himalayan	I.	Kutch
B.	Desert	II.	North West Himalaya
C.	Semi Arid	III.	Punjab
D.	Western Ghats	IV.	Malabar Coast

CUET PG PYQs for Ecology and Ecosystem with Solutions

1.El Nino and La Nina phenomena are observed in-

2.A planet having 300 K average surface temperature will emit maximum radiation in

4.Which of the following metal is used in wood preservatives ?

6.A population of genetically identical cells sharing a particular resources within an ecological riche is called -

8.Noise levels in environment are measured in

9.Choose the incorrect statement about Acid Rain.

10.The high impact species whose removal from community affects persistence of other species, and their impact is disproportionate to abundance are known as ______.

11.Match List I with List II LIST I(Biographic Zone) LIST II(Biotic Provinces)A.HimalayanI.KutchB.DesertII.North West HimalayaC.Semi AridIII.PunjabD.Western GhatsIV.Malabar CoastChoose the correct answer from the options given below:

12.Which one of the following is true about the sporophyte of Riccia ?

13.Who among the following developed the Gaia Hypothesis ?

14.Catalytic convertors in vehicle are used for -

15.What will be the concentration of nitrogen (N) in a 31 ppm solution of nitrate?

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1.
El Nino and La Nina phenomena are observed in-

2.
A planet having 300 K average surface temperature will emit maximum radiation in

4.
Which of the following metal is used in wood preservatives ?

6.
A population of genetically identical cells sharing a particular resources within an ecological riche is called -

8.
Noise levels in environment are measured in

9.
Choose the incorrect statement about Acid Rain.

10.
The high impact species whose removal from community affects persistence of other species, and their impact is disproportionate to abundance are known as ______.

11.
Match List I with List II
LIST I
(Biographic Zone) LIST II
(Biotic Provinces)
A. Himalayan I. Kutch
B. Desert II. North West Himalaya
C. Semi Arid III. Punjab
D. Western Ghats IV. Malabar Coast
Choose the correct answer from the options given below:

12.
Which one of the following is true about the sporophyte of Riccia ?

13.
Who among the following developed the Gaia Hypothesis ?

14.
Catalytic convertors in vehicle are used for -

15.
What will be the concentration of nitrogen (N) in a 31 ppm solution of nitrate?