NEET BotanyUpdated 19 Oct 2026

Environmental Issues: NEET PYQs and weightage

Environmental Issues carries 3.9 of 100 Botany marks in NEET by past-paper share: 31 of the 793 tagged NEET Botany PYQs in the ViJEEta bank (NEET 2013–2026). It ranks 14 of 21 Botany chapters.

Not in the NEET syllabus now. NTA removed Environmental Issues from NEET-UG; it is still in NCERT and school exams. Spend NEET time on the chapters below instead. The PYQs here are from before it was removed.

Take the 25-question Environmental Issues test All NEET Botany chapters

3.9/100 Weight in Botany

Exam importance (3/5, by past-paper share)

31 NEET PYQs

48 Practice questions

22 With measured difficulty

How the weight is computed: this chapter's tagged NEET PYQs divided by all tagged NEET Botany PYQs in the bank (31 of 793), times 100, with repeated questions counted once. The bank does not store the year of each NEET question, so none is printed. Computed from the bank at build time. Updated 19 Oct 2026.

How does NEET ask Environmental Issues?

8 real previous-year questions from this chapter, as printed in the paper, each with its worked solution. Answer the first one here with no sign-in.

Q1BotanyNEET UG PYQRadioactive wastes

Try right here · No sign-in

Which of these following methods is the most suitable for disposal of nuclear waste?

Answer key (C) & worked solution

Correct answer: Option C

Disposal of nuclear waste should be done in a suitably shielded area hence, to bury it within rocks deep below the earth's surface (500 m deep) is the most suitable method.

Q2BotanyNEET UG PYQWater pollution

Eutrophication of water bodies leading to killing of fishes is mainly due to non-availability of

AFood

BLight

CEssential minerals

DOxygen

Answer key (D) & worked solution

Correct answer: Option D

Domestic sewage acts as nutrients and accelerates the growth of algae that forms a mat on the water surface. This increased productivity of algae is called eutrophication which reduces the amount of dissolved oxygen available for fish and hence, leads to the death of fishes.

Q3BotanyNEET UG PYQSolid wastes

Polyblend, a fine powder of recycled modified plastic, has proved to be a good material for

AUse as a fertilizer

BConstruction of roads

CMaking tubes and pipes

DMaking plastic sacks

Answer key (B) & worked solution

Correct answer: Option B

Polyblend is a fine powder of recycled modified plastic waste. The mixture is mixed with bitumen that is used for construction of roads.

Q4BotanyNEET UG PYQOzone depletion

World Ozone Day is celebrated on

A16

^{t h}

September

B21

^{s t}

April

^{t h}

June

D22

^{n d}

April

Answer key (A) & worked solution

Correct answer: Option A

World Ozone day is celebrated on 16

^{t h}

September. 5

^{t h}

June is World Environment Day. 21

^{s t}

April is the national Yellow Bat Day. 22

^{n d}

April is National Earth Day.

Q5BotanyNEET UG PYQAir pollution

A scrubber in the exhaust of a chemical industrial plant removes:

AParticulate matter of the size 5 micrometer or above

BGases like ozone and methane

CParticulate matter of the size 2.5 micrometer or less

DGases like sulphur dioxide

Answer key (D) & worked solution

Correct answer: Option D

Scrubbers are the pollution control device which mainly helps to remove some particulates and/or gases from industrial exhaust streams.Gases like sulphur dioxide which is a major pollutant of chemical industrial plant is removed by an absorbent in the scrubber. Dry scrubbing method is mainly used for acidic gases like sulphur dioxide.

Q6BotanyNEET UG PYQAir pollution

The Air Prevention and Control of Pollution Act came into force in

A1975

B1981

C1985

D1990

Answer key (B) & worked solution

Correct answer: Option B

Air (Prevention and Control of Pollution) Act came into existence in 1981.

Q7BotanyNEET UG PYQAgrochemicals and their effects

The highest DDT concentration in aquatic food chain shall occur in

ASeagull

BCrab

CEel

DPhytoplankton

Answer key (A) & worked solution

Correct answer: Option A

DDT (dichloro, diphenyl, trichloroethane) is long chain stable and fat soluble hydrocarbon which is readily accumulated in fat tissues of organisms. Slow metabolism and excretion of DDT cause its accumulation in fat tissues of organisms (biomagnification), particularly affecting the top consumers (carnivores) causing the decrease in their population size. Phytoplankton are primary producers while Seagull is top consumers among the given options that feed on dead or live fishes and will exhibit highest DDT concentration. Therefore, the correct answer is option a.

Q8BotanyNEET UG PYQAir pollution

A location with luxuriant growth of lichens on the trees indicates that the

ATrees are heavily infested

BLocation is highly polluted

CLocation is not polluted

DTrees are very healthy

Answer key (C) & worked solution

Correct answer: Option C

Lichens are used as indicators of air pollution. They derive essential nutrients from air. So, if the air is polluted in a particular area, lichens are absent in that area. Hence, a location with luxuriant growth of lichens on the trees indicates that the location is not polluted.

Which topics in Environmental Issues carry the most questions?

All 8 topics, by tagged PYQs, then practice questions. Counted from the bank. Updated 19 Oct 2026.

Topic	PYQs	Practice questions
Air pollutionNot in NEET now	9	10
Ozone depletionNot in NEET now	9	1
Water pollutionNot in NEET now	6	24
Global warmingNot in NEET now	3	0
Agrochemicals and their effectsNot in NEET now	1	7
Solid wastesNot in NEET now	1	5
Grren house effectNot in NEET now	1	1
Radioactive wastesNot in NEET now	1	0

Why does Environmental Issues show "–" until you answer 3 questions?

Unknown is not zero. Until you answer at least 3 graded questions in Environmental Issues, ViJEEta shows – instead of a zero or a 50% default. Book exercises can raise chapter mastery up to 0.60, adaptive practice up to 0.75, and only a timed chapter test or mock can certify 0.80 and above.

How ViJEEta scores you

What happens when you test Environmental Issues?

Every chapter test is 25 questions. It starts at moderate difficulty and adapts after each saved answer. If you open a solution before answering, that attempt earns no credit, so your mastery stays honest.

Start the Environmental Issues test

Chapters either side of Environmental Issues by weight

Photosynthesis in Higher Plants Weight 4.3/100 Plant Growth and Development Weight 4.0/100 Plant Kingdom Weight 3.7/100 Respiration in Plants Weight 2.5/100