NEW DELHI: As NEET UG 2025 draws near, students are encouraged to thoroughly review the complexities of ecosystems and the environment. The set of 25 MCQs compiled by the Edufever academic team for this section serves as an excellent tool for self-assessment and practice.
NEET UG 2025: Quiz on Ecology and Environment
1.
Question: Which of the following is a characteristic feature of the temperate deciduous forest?
a) Evergreen trees
b) High biodiversity
c) Seasonal shedding of leaves
d) Sparse vegetation
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Question: The conversion of nitrogen gas to ammonia by nitrogen-fixing bacteria is known as:
a) Ammonification
b) Nitrogen fixation
c) Nitrification
d) Denitrification
3.
Question: Which of the following is the most significant source of methane in the atmosphere?
a) Volcanic eruptions
b) Forest fires
c) Livestock digestion
d) Fossil fuel combustion
4.
Question: In an aquatic ecosystem, which zone is most productive in terms of primary productivity?
a) Profundal zone
b) Benthic zone
c) Littoral zone
d) Pelagic zone
5.
Question: The process of converting ammonia to nitrites and then to nitrates is called:
a) Denitrification
b) Nitrogen fixation
c) Nitrification
d) Ammonification
6.
Question: Which of the following is a direct consequence of global warming?
a) Increased ice sheet volume
b) Rising sea levels
c) Reduced CO2 concentration in the atmosphere
d) Cooling of Earth’s surface
7.
Question: The term “biogeochemical cycle” refers to:
a) The movement of energy through an ecosystem
b) The movement of chemicals in a biological system
c) The flow of matter through the biotic components only
d) The continuous recycling of nutrients in ecosystems
8.
Question: Which of the following is the primary cause of eutrophication in water bodies?
a) High levels of dissolved oxygen
b) Excessive use of chemical fertilizers
c) Increased population of aquatic animals
d) Decreased organic matter content
9.
Question: The primary function of the ozone layer is to:
a) Absorb all solar radiation
b) Protect the Earth from harmful UV radiation
c) Generate oxygen for living organisms
d) Regulate the Earth’s temperature
10.
Question: Which of the following species is a keystone species in an ecosystem?
a) Green algae
b) Wolves in Yellowstone National Park
c) Grasshoppers
d) Deer in a forest ecosystem
11.
Question: The pyramid of energy is always:
a) Upright
b) Inverted
c) Horizontal
d) Variable
12.
Question: Which of the following is most likely to be a r-selected species?
a) Elephant
b) Human
c) Sea turtle
d) Dandelion
13.
Question: Which process is responsible for the formation of acid rain?
a) Sulfur dioxide and nitrogen oxide reacting with water vapor
b) Carbon dioxide dissolving in rainwater
c) Methane reacting with sunlight
d) Ozone depletion in the atmosphere
14.
Question: Which of the following are the primary producers in a typical terrestrial ecosystem?
a) Herbivores
b) Carnivores
c) Plants
d) Detritivores
15.
Question: In the carbon cycle, the conversion of organic carbon into inorganic carbon is done by:
a) Respiration of plants
b) Combustion of fossil fuels
c) Photosynthesis
d) Decomposition of organic matter
16.
Question: The greenhouse effect is primarily caused by the increased concentration of:
a) Ozone
b) Methane
c) Carbon dioxide
d) Nitrogen
17.
Question: Which of the following ecological pyramids is always upright?
a) Pyramid of biomass
b) Pyramid of energy
c) Pyramid of numbers
d) Pyramid of productivity
18.
Question: What is the primary cause of deforestation in tropical rainforests?
a) Agricultural expansion
b) Natural disasters
c) Conservation efforts
d) Urbanization
19.
Question: The phytoplankton in the ocean acts as:
a) Primary consumers
b) Secondary consumers
c) Primary producers
d) Decomposers
20.
Question: Which of the following is a non-renewable resource?
a) Wind energy
b) Solar energy
c) Coal
d) Biomass
21.
Question: Which of the following is the primary cause of biodiversity loss in an ecosystem?
a) Habitat destruction
b) Increased species competition
c) Reduced nutrient cycling
d) Increased rainfall
22.
Question: Which of the following processes plays a crucial role in the nitrogen cycle by converting nitrogen gas into ammonia?
a) Nitrogen fixation
b) Nitrification
c) Denitrification
d) Ammonification
23.
Question: Which of the following is an example of point source pollution?
a) Fertilizer runoff from fields
b) Oil spill from a tanker
c) Deforestation
d) Noise pollution from traffic
24.
Question: Which of the following is most likely to cause global dimming?
a) Greenhouse gases
b) Aerosols and particulate matter
c) Increased UV radiation
d) Increased solar output
25.
Question: Which of the following organisms is most likely to be found in the benthic zone of a lake?
a) Zooplankton
b) Phytoplankton
c) Fish
d) Crayfish
Answer Key:
1. c 2. b 3. c 4. c 5. c 6. b 7. d 8. b 9. b 10. b 11. a 12. d 13. a 14. c 15. b 16. c 17. b 18. a 19. c 20. c 21. a 22. a 23. b 24. b 25. d
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With 25 challenging MCQs covering Ecology and Environment, NEET UG 2025 aspirants are set to face a rigorous test of their knowledge and application of environmental science. NEET UG candidates who master these tough concepts will not only succeed in the exam but also contribute to a more sustainable future.
