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 9 of 20
- A. Energy flow
- B. Decomposition
- C. Productivity
- D. Stratification
Explanation: Four important functional aspects of the ecosystem are productivity, decomposition, energy flow and nutrient cycling.
Correct answer: Stratification- A. pond
- B. forest
- C. lake
- D. grassland.
Explanation: In forests, a single tree can support a large number of birds thus a base showing producers in a pyramid of numbers will be narrower than…
Correct answer: forest- A. net productivity
- B. secondary productivity
- C. net primary productivity
- D. gross primary productivity.
Explanation: The rate of photosynthesis of organic matter by consumers or the rate at which food energy is assimilated at the trophic level of…
Correct answer: secondary productivity- A. Azolla
- B. Typha
- C. Salix
- D. Vallisneria.
Explanation: Series of biotic communities that develop one after the other in a newly formed pond or lake is called hydrosere.
Correct answer: Vallisneria.- A. standing crop
- B. detritus
- C. humus
- D. standing state.
Explanation: Standing crop is the total amount of living material in a specified population at a particular time, expressed as biomass (standing…
Correct answer: standing crop- A. about 70%
- B. about 60%
- C. less than 50%
- D. more than 80%.
Explanation: The source of energy in all ecosystem is solar energy. About 50% of the solar energy incident over earth is present in PAR…
Correct answer: less than 50%- A. It begins on a bare rock.
- B. It occurs on a deforested site.
- C. It follows primary succession.
- D. It is similar to primary succession except that it has a relatively fast pace.
Explanation: Secondary succession begins in areas where natural biotic communities have been destroyed such as in abandoned farm lands, burned or cut…
Correct answer: It occurs on a deforested site.- A. Its base is broad
- B. It shows the energy content of different trophic-level organisms
- C. It is inverted in shape
- D. It is upright in shape
Explanation: Pyramid of energy is always upright, and can never be inverted, because when energy flows from a particular trophic level to the next…
Correct answer: It is inverted in shape- A. Sparrow
- B. Lion
- C. Goat
- D. Frog.
Explanation: The sparrow can be herbivorous (eating seeds and fruits) or carnivorous (eating insects).
Correct answer: Sparrow- A. Medium water conditions
- B. xeric conditions
- C. highly dry conditions
- D. excessive wet conditions.
Explanation: Hydrarch succession takes place in wetter areas and the successional series progresses from hydric to the mesic condition.
Correct answer: Medium water conditions- A. humification
- B. fragmentation
- C. mineralisation
- D. catabolism.
Explanation: Decomposition is the process in which decomposers break down complex organic matter into inorganic substances like carbon dioxide, water…
Correct answer: fragmentation- A. net primary productivity
- B. secondary productivity
- C. standing crop
- D. gross primary productivity.
Explanation: The total organic matter synthesised by the producers in the process of photosynthesis per unit time and area is known as gross primary…
Correct answer: net primary productivity- A. D
- B. A
- C. B
- D. C
Explanation: The representation of the forest ecosystem in the pyramid of numbers is always upright because the higher trophic level comprising…
Correct answer: C- A. Fish
- B. Zooplankton
- C. Frog
- D. Phytoplankton
Explanation: A single species may occupy more than one trophic level. In ponds, fish occupy more than one trophic level.
Correct answer: Fish- A. A, D
- B. A, B
- C. B, C
- D. C, D
Explanation: Removal of 80% of tigers (i.e., tertiary consumer) from an area resulted in decreased growth of vegetation because there will be increased…
Correct answer: B, C- A. The anaerobic environment around them
- B. Low cellulose content
- C. Low moisture content
- D. Poor nitrogen content.
Explanation: The microorganisms break down the complex compounds of dead protoplasm of producers and consumers absorb some of the decomposition…
Correct answer: Low moisture content- A. Oceans
- B. Forests
- C. Grasslands
- D. Agroecosystems.
Explanation: Carbon constitutes 49% of the dry weight of an organism and is next only to water.
Correct answer: Oceans- A. Fresh weight
- B. Dry weight
- C. Number of individuals
- D. Rate of energy flow
Explanation: Ecological pyramids represent the trophic structure and trophic function of an ecosystem.
Correct answer: Fresh weight- A. Low stability and high resilience
- B. High stability and low resilience
- C. Low stability and low resilience
- D. High stability and high resilience.
Explanation: Stability can be defined as the power of a system to be in its state against unfavorable factors and resilience is the capability of…
Correct answer: Low stability and high resilience- A. First trophic level (T1 )
- B. Second trophic level (T2 )
- C. Third trophic level (T3 )
- D. Fourth trophic level (T4 )
Explanation: The trophic structure of an ecosystem is a type of producer-consumer arrangement in which each food level is called a trophic level and…
Correct answer: First trophic level (T1 )