AKTU Environment and Ecology · Important Questions 2026Source: ryzenstudy.com PYQs
BAS104 Environment and Ecology Important Questions 2026 (AKTU)
Repeat analysis + most-asked questions, unit-wise
What we did: built from all 7 AKTU Environment and Ecology papers (2022-23 (Sem 1)–2025-26): 153 questions grouped into 84 distinct questions, 29 of which were asked in more than one paper.
- of marks were repeat questions
- 57%
- of marks were repeat questions
- questions asked in 2+ papers
- 29
- questions asked in 2+ papers
- papers analysed (2022-23 (Sem 1)–2025-26)
- 7
- papers analysed (2022-23 (Sem 1)–2025-26)
- units, mapped to current syllabus
- 5
- units, mapped to current syllabus
How much of the paper repeats?
- Repeats are real: when we checked each newer BAS104 paper against the papers before it, on average 57% of its marks were questions already asked in an earlier paper.
- 2023-24 (Sem 1) paper: 43% of marks were repeats (5 of 10 repeated questions were in our top list).
- 2023-24 (Sem 2) paper: 50% of marks were repeats (3 of 10 repeated questions were in our top list).
- 2024-25 (Sem 1) paper: 47% of marks were repeats (7 of 11 repeated questions were in our top list).
- 2024-25 (Sem 2) paper: 56% of marks were repeats (10 of 12 repeated questions were in our top list).
- 2025-26 paper: 89% of marks were repeats (13 of 19 repeated questions were in our top list).
- Topic weightage is a guide, not a guarantee: our Tier 1 + Tier 2 topics covered 61% of the next paper's marks — picking the same number of topics at random would have covered about 57%.
Across 10 subjects and 23 papers we tested, 43% of marks repeated earlier questions on average.
1.Unit-wise most-asked questions
Ranked by how many papers asked them, then by how recently. Click a paper to open it.
Unit 1: Environment · Ecosystem
25% of past marks| Question | Asked |
|---|---|
| Define environment and explain its types, components, and segments in detail. Also discuss the scope and importance of environmental studies | Asked 5× |
| What is the purpose of an Environmental Impact Assessment? What are the steps involved in conducting an EIA? | Asked 5× |
| Discuss the effects of human activities such as agriculture, industry, mining, transportation and urbanization on the environment | Asked 4× |
| Explain the structure and functions of an ecosystem with a neat diagram | Asked 3× |
Unit 2: Natural Resources
21% of past marks| Question | Asked |
|---|---|
| Describe forest resources, causes of deforestation and its environmental and social impacts | Asked 3× |
| Explain carbon, nitrogen and sulfur cycles with neat diagrams and describe their environmental significance | Asked 2× |
| Explain the classification of natural resources and discuss their sustainable utilization | Asked 2× |
| Discuss the availability, sources, and quality aspects of water resources. Explain the problems associated with fluoride and arsenic in drinking water | Asked 2× |
Unit 3:
16% of past marks| Question | Asked |
|---|---|
| Describe solid waste management techniques and their importance in urban areas | Asked 3× |
| Discuss water pollution in detail, including its causes, effects and control measures | Asked 3× |
| Define pollution and explain different types of pollution with their sources and effects | Asked 2× |
| What are the major sources of noise pollution? What are some strategies to reduce noise pollution in urban areas? | Asked 2× |
Unit 4:
22% of past marks| Question | Asked |
|---|---|
| Explain global warming and climate change. Discuss their causes, impacts and mitigation measures | Asked 6× |
| Describe the relationship between human population growth and environmental degradation | Asked 6× |
| Explain the causes and effects of acid rain | Asked 5× |
| Describe the causes and impacts of ozone layer depletion | Asked 3× |
Unit 5:
16% of past marks| Question | Asked |
|---|---|
| Discuss the importance of environmental education and women education in protecting the environment | Asked 5× |
| Discuss role of NGOs in sustainable development | Asked 5× |
| State the objective of Environmental Protection Act, 1986 | Asked 4× |
| What are the challenges and opportunities in achieving effective environmental protection? 7 marks2024-25 (Sem 1) Q2(e) | Asked 1× |
2.Topic weightage: which topics carry the marks
Blue = Tier 1 + Tier 2 (topics that carried ~80% of past marks). Grey = the rest. It shows where marks have gone, not a promise of what comes next.
Global warming and greenhouse effect · U4
6.6% (cum 7%)
Environmental Protection Act 1986 · U5
5.7% (cum 12%)
Material cycles · U2
5.6% (cum 18%)
Human activities and environment · U1
5.1% (cum 23%)
Environment and components · U1
5.1% (cum 28%)
Solid waste management · U3
4.3% (cum 32%)
Ecosystem structure and types · U1
4.2% (cum 37%)
Acid rain · U4
3.9% (cum 41%)
Pollution and public health · U3
3.6% (cum 44%)
Water resources and quality · U2
3.4% (cum 48%)
Environmental Impact Assessment · U1
3.4% (cum 51%)
Environmental education · U5
3.1% (cum 54%)
Role of NGOs · U5
3.1% (cum 57%)
Forest resources · U2
3% (cum 60%)
Air pollution · U3
3% (cum 63%)
Classification of natural resources · U2
2.9% (cum 66%)
Population growth · U4
2.9% (cum 69%)
Burning of paddy straw · U4
2.7% (cum 72%)
Ozone layer depletion · U4
2.7% (cum 74%)
Energy resources · U2
2.7% (cum 77%)
Water pollution · U3
2.7% (cum 80%)
Ecological pyramids · U1
2.3% (cum 82%)
Climate change · U4
2.3% (cum 84%)
Population and environment · U5
2.3% (cum 87%)
Sustainable development · U1
2.3% (cum 89%)
Noise pollution · U3
2% (cum 91%)
Women education · U5
1.6% (cum 93%)
Water borne diseases · U2
1.4% (cum 94%)
Scope and public awareness · U1
1.3% (cum 95%)
Food chain and food web · U1
1.1% (cum 96%)
Fluoride and arsenic problems · U2
1.1% (cum 97%)
Soil pollution · U3
0.9% (cum 98%)
Mineral resources · U2
0.7% (cum 99%)
Automobile pollution · U4
0.7% (cum 100%)
Balanced ecosystem · U1
0.4% (cum 100%)
| Topic | Papers | Share |
|---|---|---|
| Global warming and greenhouse effect · Unit 4 · Tier 1 | 7/7 | 6.6% |
| Environmental Protection Act 1986 · Unit 5 · Tier 1 | 6/7 | 5.7% |
| Material cycles · Unit 2 · Tier 1 | 7/7 | 5.6% |
| Human activities and environment · Unit 1 · Tier 1 | 5/7 | 5.1% |
| Environment and components · Unit 1 · Tier 1 | 6/7 | 5.1% |
| Solid waste management · Unit 3 · Tier 1 | 5/7 | 4.3% |
| Ecosystem structure and types · Unit 1 · Tier 1 | 5/7 | 4.2% |
| Acid rain · Unit 4 · Tier 1 | 5/7 | 3.9% |
| Pollution and public health · Unit 3 · Tier 1 | 3/7 | 3.6% |
| Water resources and quality · Unit 2 · Tier 1 | 4/7 | 3.4% |
| Environmental Impact Assessment · Unit 1 · Tier 1 | 5/7 | 3.4% |
| Environmental education · Unit 5 · Tier 2 | 5/7 | 3.1% |
| Role of NGOs · Unit 5 · Tier 2 | 5/7 | 3.1% |
| Forest resources · Unit 2 · Tier 2 | 4/7 | 3% |
| Air pollution · Unit 3 · Tier 2 | 3/7 | 3% |
| Classification of natural resources · Unit 2 · Tier 2 | 4/7 | 2.9% |
| Population growth · Unit 4 · Tier 2 | 4/7 | 2.9% |
| Burning of paddy straw · Unit 4 · Tier 2 | 4/7 | 2.7% |
| Ozone layer depletion · Unit 4 · Tier 2 | 4/7 | 2.7% |
| Energy resources · Unit 2 · Tier 2 | 5/7 | 2.7% |
| Water pollution · Unit 3 · Tier 2 | 3/7 | 2.7% |
| Ecological pyramids · Unit 1 · Tier 2 | 3/7 | 2.3% |
| Climate change · Unit 4 · Tier 3 | 3/7 | 2.3% |
| Population and environment · Unit 5 · Tier 3 | 3/7 | 2.3% |
| Sustainable development · Unit 1 · Tier 3 | 4/7 | 2.3% |
| Noise pollution · Unit 3 · Tier 3 | 3/7 | 2% |
| Women education · Unit 5 · Tier 3 | 2/7 | 1.6% |
| Water borne diseases · Unit 2 · Tier 3 | 2/7 | 1.4% |
| Scope and public awareness · Unit 1 · Tier 3 | 2/7 | 1.3% |
| Food chain and food web · Unit 1 · Tier 3 | 2/7 | 1.1% |
| Fluoride and arsenic problems · Unit 2 · Tier 3 | 2/7 | 1.1% |
| Soil pollution · Unit 3 · Tier 3 | 1/7 | 0.9% |
| Mineral resources · Unit 2 · Tier 3 | 1/7 | 0.7% |
| Automobile pollution · Unit 4 · Tier 3 | 1/7 | 0.7% |
| Balanced ecosystem · Unit 1 · Tier 3 | 1/7 | 0.4% |
3.Paper pattern (2025-26)
| Section | Questions | Rule |
|---|---|---|
| A | 7 × 2 marks | Attempt all |
| B | 5 × 7 marks | Attempt any 3 |
| C | 10 × 7 marks | Attempt any 1 |
4.Study order
- 1Global warming and greenhouse effect (Unit 4, Tier 1)
- 2Environmental Protection Act 1986 (Unit 5, Tier 1)
- 3Material cycles (Unit 2, Tier 1)
- 4Human activities and environment (Unit 1, Tier 1)
- 5Environment and components (Unit 1, Tier 1)
- 6Solid waste management (Unit 3, Tier 1)
- 7Ecosystem structure and types (Unit 1, Tier 1)
- 8Acid rain (Unit 4, Tier 1)
- 9Pollution and public health (Unit 3, Tier 1)
- 10Water resources and quality (Unit 2, Tier 1)
- 11Environmental Impact Assessment (Unit 1, Tier 1)
- 12Environmental education (Unit 5, Tier 2)
- 13Role of NGOs (Unit 5, Tier 2)
- 14Forest resources (Unit 2, Tier 2)
- 15Air pollution (Unit 3, Tier 2)
- 16Classification of natural resources (Unit 2, Tier 2)
- 17Population growth (Unit 4, Tier 2)
- 18Burning of paddy straw (Unit 4, Tier 2)
- 19Ozone layer depletion (Unit 4, Tier 2)
- 20Energy resources (Unit 2, Tier 2)
- 21Water pollution (Unit 3, Tier 2)
- 22Ecological pyramids (Unit 1, Tier 2)
FAQ
Which units of BAS104 carry the most marks?
Unit 1 (Environment · Ecosystem, 25% of past marks) and Unit 4 (, 22% of past marks).
Do AKTU Environment and Ecology questions repeat?
Yes. On average 57% of the marks in each newer BAS104 paper came from questions already asked in an earlier paper, and 29 questions have appeared in more than one paper.
How is this list made?
Every question from the 7 papers (2022-23 (Sem 1)–2025-26) was mapped to the current AKTU syllabus and grouped with the same question from other years. Questions are ranked by how many papers they appeared in, then by how recently.
Study this subject
Note: this is based on past AKTU papers, not a guarantee. Questions are mapped to the current syllabus; topics that are no longer in the syllabus are left out.