Free Man and His Environment MCQs with Answers
382 Man and His Environment MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Ecosystems include biotic and abiotic components, food chains and webs, energy flow, nutrient cycles, populations and ecological relationships. Pollution and conservation cover air, water, soil and noise pollution, their effects on organisms, biodiversity loss, protected areas, sustainable resource use and methods for reducing environmental damage.
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Read the Man and His Environment notesFree MDCAT chapter notes with key terms382 questions · page 18 of 20
- A. Mutualism
- B. Commensalism
- C. Predation
- D. Parasitism
Explanation: The relationship in which one organism gets benefit and the other is not affected is called commensalism.
Correct answer: Commensalism- A. Lichens
- B. Shrubs
- C. Moss
- D. Herbs
Explanation: Lichens: This option is the correct answer. Lichens are the first organisms that typically colonize and establish on bare rock during…
Correct answer: Lichens- A. 1
- B. 3
- C. 4
- D. 2
Explanation: D option is the correct answer. The trophic level of a herbivore is generally at the second level.
Correct answer: 2- A. Primary consumer
- B. Primary producer
- C. Tertiary consumer
- D. Secondary consumer
Explanation: Secondary consumers belong to trophic level three, they feed on primary consumers.
Correct answer: Secondary consumer- A. Photosynthesis
- B. Sun
- C. Plants
- D. Water
Explanation: Sun is the ultimate source of energy because it is the source of most of the energies on Earth.
Correct answer: Sun- A. Detritus
- B. Herbivores
- C. Green plants
- D. Omnivores
Explanation: The living part of the food chain always begins with plant life, as plants are the only organisms that get their energy from a nonliving…
Correct answer: Green plants- A. Pioneers
- B. Xerosere
- C. Succession
- D. Secondary succession
Explanation: A broad definition of succession states: 'Ecological succession is the process by which the mix of species and habitat in an area changes…
Correct answer: Succession- A. Bacterial reduction of NO3- ions to N2 gas.
- B. Active uptake of Nitrate ions by plant roots
- C. Drainage of manure from fields
- D. Leaching of nitrate ions
Explanation: Denitrification is a natural soil microbial process where nitrate ions are converted to nitrogen gas which is then lost to the atmosphere.
Correct answer: Bacterial reduction of NO3- ions to N2 gas.- A. It causes radiation pollution
- B. It is very expensive
- C. It is not long lasting
- D. It pollutes the air
Explanation: Explanation:One of the major drawbacks of nuclear energy is the risk of radiation pollution in the event of accidents, such as the…
Correct answer: It causes radiation pollution- A. Cyanobacteria
- B. Mycorrhizae
- C. Fungi
- D. Lichens
Explanation: Explanation:Correct answer is lichen as they are used as an bioindicator specifically for air pollution.
Correct answer: Lichens- A. Biosphere
- B. Atmosphere
- C. Lithosphere
- D. Hydrosphere
Explanation: [A] Biosphere is made up of the parts of earth where life exists[B] Atmosphere is the layer of gases around earth and ozone is present in…
Correct answer: Atmosphere- A. Eutrophication
- B. Photosynthesis
- C. Decomposition
- D. Recycling
Explanation: Option A is correct since Eutrophication is the process in which the water body has an enriched amount of nutrients and thus more life and…
Correct answer: Eutrophication- A. Geothermal energy
- B. Thermal energy
- C. Electric energy
- D. Solar energy
Explanation: Option A is correct since Geothermal energy is natural heat trapped underground.Option B is incorrect because Thermal energy is only heat…
Correct answer: Geothermal energy- A. Chlorine
- B. Bromine
- C. Chlorofluorocarbon
- D. Carbon
Explanation: Thinning in the ozone layer is caused by increasing concentrations of ozone-depleting chemicals - chlorofluorocarbons or CFCs (compounds…
Correct answer: Chlorofluorocarbon- A. Archeotrophication
- B. Eutrophication
- C. Enrichment
- D. Low Trophication
Explanation: Eutrophication is characterized by excessive plant and algal growth due to the increased availability of one or more limiting growth…
Correct answer: Eutrophication- A. Oxides of carbon
- B. Oxides of nitrogen and Sulphur
- C. Oxides of Sulphur
- D. Oxides of nitrogen
Explanation: Nitrogen dioxide acts as a catalyst and reacts with sulphur dioxide to form sulphur trioxide, which is the main culprit of acid rain.
Correct answer: Oxides of nitrogen and Sulphur- A. Ultra-violet radiations
- B. Greenhouse gases
- C. Nitrogen oxide
- D. Sulphur oxide
Explanation: The ozone layer absorbs Ultra-violet radiation. Depletion of ozone layer results in increased amount of Ultra-violet radiation reaching…
Correct answer: Ultra-violet radiations- A. Water pollution
- B. Air pollution
- C. Eutrophication
- D. Industrial effects
Explanation: Eutrophication is characterized as the excess growth of algae or aquatic plants due to an increase in one or more growth limiting factors…
Correct answer: Eutrophication- A. Increasing levels of nitrogen oxide
- B. Decreasing level of O2
- C. Decreasing level of CFCs
- D. Increasing levels of CFCs
Explanation: An increase in CFC gas is responsible for the deterioration of the ozone layer.
Correct answer: Increasing levels of CFCs- A. Antibiotics
- B. Pesticides
- C. Disinfectants
- D. Chemotherapeutic agents
Explanation: Pesticides are a class of chemicals that are used to kill crop-eating insects, unwanted weeds etc.
Correct answer: Pesticides