IGNOU BEVAE 181 EXAM INFORMATIONS📒
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(BEVAE 181 परीक्षा के लिए महत्वपूर्ण विवरण - 3 जनवर 3,2026 )
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█ You studied nature, earth, and sky, █
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With Important Questions - 1000
With PYQ(Previous Year Question Paper)
With Study Material Pdf
Answer Sheet Example -
Course Code: BEVAE 181
(कोर्स कोड: BEVAE 181)
Exam Duration: 2 hours (Not 3 hours as some hall tickets suggest)
परीक्षा अवधि: 2 घंटे (3 घंटे नहीं)
Exam Type: Multiple Choice Questions (MCQs) ✍️
परीक्षा का प्रकार: बहुविकल्पीय प्रश्न (एमसीक्यू)
Answer Format: OMR Sheet (No traditional answer booklet)
उत्तर प्रारूप: ओएमआर शीट (कोई पारंपरिक उत्तर पुस्तिका नहीं)
Languages Available: English and Hindi
उपलब्ध भाषाएँ: अंग्रेजी और हिंदी
🔢 Options Per Question:
4 choices (1, 2, 3, or 4)
Important Notes on Marking:
✔️ Only Fill one Circle per question.
✔️ No penalty for wrong answers (attempt all questions).
❌ If you change your mind, mark the incorrect answer with an "X".
Total Questions: 50 questions,
1 mark For each Right Answer ✅
No Negative Marking✅️
Passing Criteria: Minimum of 18 marks required to pass
OMR Sheet Guidelines:
Only darkened circles in black will be detected.
Ensure clarity in marking.
Double-check your answers before submission
IMPORTANT QUESTIONS
•By IGNOU QUERY HUB-
BEVAE-181 Block 1
1.What is the environment?
Answer: The surroundings in which an organism lives.
2.Which sphere includes all water bodies on Earth?
Answer: Hydrosphere.
3.What are biotic factors?
Answer: Living components of an ecosystem.
4.Which of the following is an abiotic factor?
Answer: Sunlight.
5.What does the lithosphere consist of?
Answer: Earth’s crust and upper mantle.
6.Which gas is the most abundant in the atmosphere?
Answer: Nitrogen.
7.What is an ecosystem?
Answer: A system of interactions between living and non-living components.
8.Who introduced the concept of environmental determinism?
Answer: Friedrich Ratzel.
9.In which year was the Brundtland Report published?
Answer: 1987.
10.What is sustainable development?
Answer: Development meeting present needs without compromising future generations.
11.Which is a natural ecosystem?
Answer: Forest.
12.What is the primary source of energy for Earth’s ecosystems?
Answer: Sun.
13.Which of the following is a human-made environment?
Answer: City.
14.What does the term “ecology” study?
Answer: Interactions between organisms and their environment.
15.Which ecosystem is known for high biodiversity?
Answer: Tropical rainforest.
16.What is the main function of forests in water conservation?
Answer: Preventing soil erosion.
17.Which gas do forests absorb during photosynthesis?
Answer: Carbon dioxide.
18.What is the hydrosphere primarily composed of?
Answer: Water.
19.Who coined the term “ecology”?
Answer: Ernst Haeckel.
20.Which is not a component of the atmosphere?
Answer: Soil.
21.What is the primary role of decomposers in an ecosystem?
Answer: Break down dead organic matter.
22.Which ecosystem covers the largest area of Earth’s surface?
Answer: Ocean.
23.What is the biosphere?
Answer: The zone where life exists.
24.Which of the following is an example of a terrestrial ecosystem?
Answer: Grassland.
25.What is environmental determinism?
Answer: The idea that the environment shapes human behavior.
26.Which report defined sustainable development?
Answer: Our Common Future.
27.What is the main source of air pollution in urban areas?
Answer: Vehicles.
28.Which layer of the atmosphere contains the ozone layer?
Answer: Stratosphere.
29.What is the role of producers in an ecosystem?
Answer: Produce food through photosynthesis.
30.Which of the following is a renewable resource?
Answer: Solar energy.
31.What is the primary component of soil?
Answer: Mineral matter.
32.Which ecosystem is characterized by low rainfall?
Answer: Desert.
33.What is the main cause of soil erosion?
Answer: Water runoff.
34.Which gas is essential for photosynthesis?
Answer: Carbon dioxide.
35.What is the primary function of wetlands?
Answer: Water purification.
36.Which of the following is a non-renewable resource?
Answer: Coal.
37.What is the main source of energy for aquatic ecosystems?
Answer: Sunlight.
38.Which sphere is affected by deforestation?
Answer: Biosphere.
39.What is the role of consumers in an ecosystem?
Answer: Feed on other organisms.
40.Which ecosystem is found in coastal areas?
Answer: Estuary.
41.What is the main cause of global warming?
Answer: Greenhouse gas emissions.
42.Which of the following is a function of forests?
Answer: Carbon sequestration.
43.What is the primary source of oxygen in the atmosphere?
Answer: Photosynthesis.
44.Which ecosystem supports coral reefs?
Answer: Marine.
45.What is the main component of the Earth’s core?
Answer: Iron.
46.Which of the following is an abiotic component of a pond ecosystem?
Answer: Water.
47.What is the primary goal of environmental studies?
Answer: Promote sustainable living.
48.Which international conference popularized sustainable development?
Answer: Rio Earth Summit.
49.What is the primary source of nitrogen in the atmosphere?
Answer: Volcanic activity.
50.Which ecosystem is characterized by extreme cold and low precipitation?
Answer: Tundra.
51.What is the role of scavengers in an ecosystem?
Answer: Feed on dead animals.
52.Which of the following is a component of the biosphere?
Answer: Plants.
53.What is the main source of water pollution?
Answer: Industrial waste.
54.Which layer of the atmosphere is closest to the Earth’s surface?
Answer: Troposphere.
55.What is the primary function of grasslands?
Answer: Support grazing animals.
56.Which of the following is a human activity affecting ecosystems?
Answer: Deforestation.
57.What is the main source of energy for Earth’s climate system?
Answer: Solar radiation.
58.Which ecosystem is known for seasonal flooding?
Answer: Wetland.
59.What is the primary component of the atmosphere?
Answer: Nitrogen.
60.Which of the following is a function of the atmosphere?
Answer: Regulates temperature.
61.What is the main cause of desertification?
Answer: Overgrazing.
62.Which ecosystem is dominated by trees?
Answer: Forest.
63.What is the role of bacteria in an ecosystem?
Answer: Decomposition.
64.Which of the following is an example of a freshwater ecosystem?
Answer: Lake.
65.What is the primary source of carbon in the biosphere?
Answer: Carbon dioxide.
66.Which sphere is affected by urbanization?
Answer: Lithosphere.
67.What is the main function of mangroves in coastal ecosystems?
Answer: Prevent coastal erosion.
68.Which of the following is a renewable resource?
Answer: Wind energy.
69.What is the primary source of soil pollution?
Answer: Pesticides.
70.Which ecosystem is characterized by high salinity?
Answer: Ocean.
71.What is the main role of herbivores in an ecosystem?
Answer: Consume plants.
72.Which of the following is an abiotic factor in a forest ecosystem?
Answer: Temperature.
73.What is the primary source of energy for photosynthesis?
Answer: Sunlight.
74.Which ecosystem is found at high altitudes?
Answer: Alpine
75.What is the main cause of biodiversity loss?
Answer: Habitat destruction.
76.Which of the following is a function of coral reefs?
Answer: Support marine biodiversity.
77.What is the primary component of the hydrosphere?
Answer: Water.
78.Which layer of the Earth is liquid?
Answer: Outer core.
79.What is the role of carnivores in an ecosystem?
Answer: Control herbivore populations.
80.Which ecosystem is characterized by permafrost?
Answer: Tundra.
81.What is the main source of greenhouse gases?
Answer: Burning fossil fuels.
82.Which of the following is a function of the lithosphere?
Answer: Supports terrestrial ecosystems.
83.What is the primary role of phytoplankton in marine ecosystems?
Answer: Produce oxygen.
84.Which ecosystem is found in brackish water?
Answer: Estuary.
85.What is the main source of acid rain?
Answer: Sulfur dioxide emissions.
86.Which of the following is a non-living component of an ecosystem?
Answer: Soil.
87.What is the primary function of the ozone layer?
Answer: Absorb UV radiation.
88.Which ecosystem is dominated by grasses?
Answer: Grassland.
89.What is the main cause of ozone depletion?
Answer: Chlorofluorocarbons (CFCs).
90.Which of the following is a function of forests?
Answer: Regulate climate.
91.What is the primary source of water in the hydrosphere?
Answer: Oceans.
92.Which ecosystem is characterized by extreme heat?
Answer: Desert.
93.What is the role of omnivores in an ecosystem?
Answer: Consume plants and animals.
94.Which of the following is an example of a marine ecosystem?
Answer: Coral reef.
95.What is the main source of land pollution?
Answer: Solid waste.
96.Which sphere supports all life forms?
Answer: Biosphere.
97.What is the primary function of roots in plants?
Answer: Absorb water and nutrients.
98.Which ecosystem is found in polar regions?
Answer: Tundra.
99.What is the main source of energy for ecosystems?
Answer: Sunlight.
100.Which of the following is a function of wetlands?
Answer: Flood control.
101.What is the primary component of the Earth’s crust?
Answer: Silicates.
102.Which ecosystem is characterized by dense vegetation?
Answer: Tropical rainforest.
103.What is the main cause of waterlogging?
Answer: Poor drainage.
104.Which of the following is a biotic component of a lake ecosystem?
Answer: Fish.
105.What is the primary source of atmospheric oxygen?
Answer: Photosynthesis.
106.Which ecosystem is affected by overfishing?
Answer: Marine.
107.What is the main function of the atmosphere in climate regulation?
Answer: Traps heat.
108.Which of the following is a non-renewable resource?
Answer: Petroleum.
109.What is the primary role of fungi in an ecosystem?
Answer: Decomposition.
110.Which ecosystem is found in rivers?
Answer: Lotic.
○What is the main source of noise pollution?
Answer: Vehicles.
111.Which sphere is affected by mining?
Answer: Lithosphere.
112.What is the primary function of coral reefs in marine ecosystems?
Answer: Provide habitat.
113.Which ecosystem is characterized by seasonal rainfall?
Answer: Savanna.
Some PYQs Links
Bevae 181 [ Enviornmental Studies]
Study Material Link -
English - Link
Hindi - You Will be find the Book at
✅ Exam Focus Areas:
°Environment & Ecology (basic concepts)
°Sustainable Development
°Pollution (air, water, soil, noise)
°Climate Change & Global Warming
°Biodiversity & Conservation
°Environmental Movements & Laws
°Renewable & Non-renewable Resources
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