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 10 of 20
- A. Monera and Fungi
- B. Fungi and Plants
- C. Protista and Animalia
- D. Animalia and Monera.
Explanation: Microorganisms (bacteria and fungi) are decomposers of the ecosystem. They feed upon dead decaying living organisms (both plant and…
Correct answer: Monera and Fungi- A. Nano plankton, blue-green algae, and green algae
- B. Sea grass and slime moulds
- C. Benthoic and brown algae
- D. Diatoms
Explanation: The benthic region includes all the seafloor from the wave-washed shore-line to the greatest depths.
Correct answer: Benthoic and brown algae- A. 10%
- B. 20%
- C. 1%
- D. 2%.
Explanation: Herbivores are eaten by primary carnivores. Only 10% of the herbivores productivity is utilized for raising productivity of primary…
Correct answer: 10%- A. T 3
- B. T 4
- C. T 1
- D. T 2
Explanation: In a terrestrial ecosystem, maximum energy is in trophic level I because the organisms that trap solar energy are primary producers and…
Correct answer: T 1- A. Mangroves
- B. Rainforest
- C. Grassland
- D. Coral reef
Explanation: Gross primary productivity is the total rate of photosynthesis, including the organic matter used up in respiration during the measurement…
Correct answer: Rainforest- A. Insects
- B. Microorganisms
- C. Man
- D. Animals
Explanation: Microorganisms (bacteria and mold) are decomposers of the ecosystem. They feed upon dead decaying organisms (both plants and animals) and…
Correct answer: Microorganisms- A. Lindemann
- B. Tansley
- C. Stanley
- D. Weismann.
Explanation: Herbivores are eaten by primary carnivores. Only 10% of the herbivore's productivity is utilized for raising the productivity of primary…
Correct answer: Lindemann- A. Mineral movement will be blocked
- B. The rate of decomposition will be very high
- C. Energy flow will be blocked
- D. Herbivores will not receive solar energy.
Explanation: Decomposers are saprotrophs which decompose the organic remains by secreting extracellular digestive enzymes.
Correct answer: Mineral movement will be blocked- A. Phosphorus and nitrogen
- B. Phosphorus and sulphur
- C. Oxygen and nitrogen
- D. Phosphorus and carbon dioxide
Explanation: Biogeochemical cycles are of two types: gaseous and sedimentary. In gaseous nutrient cycles, the materials involved in circulation between…
Correct answer: Phosphorus and sulphur- A. Mountain
- B. Ocean
- C. Forest
- D. Desert
Explanation: Of all the ecosystems, the ocean is the largest and most stable ecosystem.
Correct answer: Ocean- A. Forest that is clearing after a devastating fire
- B. Newly-exposed habitat with no record of earlier vegetation
- C. Freshly cleared crop field
- D. Pond freshly filled with water after a dry phase.
Explanation: When succession begins on an area that has not been previously being occupied by a community, for e.g., a newly exposed rock area, sand…
Correct answer: Newly-exposed habitat with no record of earlier vegetation- A. Phytoplankton
- B. Zooplankton
- C. Benthos
- D. Plankton.
Explanation: A trophic level is a step or division of a food chain that is characterized by the method of obtaining its food.
Correct answer: Zooplankton- A. Species in an area
- B. Individuals in a community
- C. Individuals in a trophic level
- D. Subspecies in a community.
Explanation: The pyramid of numbers is an ecological pyramid that employs the number of individuals per unit area at various trophic levels…
Correct answer: Individuals in a trophic level- A. Irregular
- B. Inverted
- C. Upright
- D. Spindle shaped.
Explanation: The pyramid of numbers is an ecological pyramid that employs the number of individuals per unit area at various trophic levels…
Correct answer: Upright- A. Parasitic food chain
- B. Detritus food chain
- C. Consumer food chain
- D. Predator food chain.
Explanation: The dead organic matter of plants or animals is called detritus. While a part of it remains on the soil surface as litter, the other part…
Correct answer: Detritus food chain- A. Grass -- Chameleon -- Insect -- Bird
- B. Grass -- Fox -- Rabbit -- Bird
- C. Phytoplankton -- Zooplankton -- Fish
- D. Fallen leaves -- Bacteria -- Insect larvae
Explanation: The process of transfer of energy from producers through a series of organisms, i.e., from primary consumers to secondary consumers and…
Correct answer: Phytoplankton -- Zooplankton -- Fish- A. Always inverted
- B. Always upright
- C. Both (a) and (b)
- D. Spindle-shaped.
Explanation: Pyramid of numbers in a grassland/tree ecosystem is always upright. It shows the number of individual organisms at each level.
Correct answer: Always upright- A. Plankton
- B. Nekton
- C. Plankton and Nekton
- D. Benthos
Explanation: Planktons are passively floating in upper water, nektons are actively swimming and benthos lead sedentary life upon the sea bottom.
Correct answer: Plankton- A. Primary consumers are the least dependent upon producers.
- B. Primary consumers outnumber producers.
- C. Producers are more than primary consumers.
- D. Secondary consumers are the largest and most powerful.
Explanation: An ecosystem may be defined as a structural and functional unit of the biosphere comprising living organisms and their nonliving…
Correct answer: Producers are more than primary consumers.- A. Free energy
- B. Carbon
- C. Nitrogen
- D. Potassium
Explanation: The behavior of energy in an ecosystem can be termed as energy flow due to the unidirectional flow of energy.
Correct answer: Free energy