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 2 of 20
- A. Uniform distribution
- B. Clumped distribution
- C. Carrying capacity
- D. Density
Explanation: Option C is correct because carrying capacity refers to the maximum population size that a particular environment can sustainably support…
Correct answer: Carrying capacity- A. Start with primary consumers
- B. Formed from food chain
- C. Stable than food chain
- D. Complex than food chain
Explanation: A food web is a graphical representation of interconnected food chains.
Correct answer: Start with primary consumers- A. Nitrification
- B. Nitrogen Fixation
- C. Ammonification
- D. Denitrification
Explanation: Nitrosomonas convert ammonia into nitrates by a process called nitrification.
Correct answer: Nitrification- A. Intraspecific competition.
- B. Interspecific competition
- C. Environmental competition
- D. All of the above
Explanation: In a forest, palm trees have to face all sorts of competition (intraspecific, interspecific, and environmental).
Correct answer: All of the above- A. Herbivores
- B. Carnivores
- C. Omnivores
- D. Detritivores
Explanation: Detritivores, also known as detritophages, detritus feeders, detritus eaters, or saprophages, are heterotrophs that obtain nutrients by…
Correct answer: Detritivores- A. Reproduction
- B. Adaptability
- C. Mitosis
- D. Respiration
Explanation: Reproduction is the biological process by which new individual organisms "offspring" are produced from their "parents" Adaptability means…
Correct answer: Reproduction- A. Level of ecosystem
- B. Food chain
- C. Food web
- D. Trophic level
- E. Energy pyramid
Explanation: Option A most likely refers to levels of ecology (since there isn't such a thing as level of ecosystem), which are organism, population…
Correct answer: Trophic level- A. Water
- B. Light and nutrients
- C. Light
- D. Nutrients
Explanation: The productivity of the aquatic ecosystem is determined on the basis of availability of light and nutrients to it, hence, option B is…
Correct answer: Light and nutrients- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: The conversion of nitrates in the soil to nitrogen is called the denitrifying(P) process, which is carried out by denitrifying bacteria.
Correct answer: Option A- A. 3 and 2
- B. 4 and 1
- C. 5 and 2
- D. 5 and 4
- E. 1 and 2
Explanation: Trophic level is determined by the place the organism occupies after the producer trophic level.
Correct answer: 1 and 2- A. Dry season is very long and the temperature ranges more than 18 C throughout the year
- B. Its plants do not shed off their leaves
- C. The subsoil is permanently frozen
- D. Rainfall is up to 200 cm per year
- E. Rainfall exceeds evaporation
Explanation: The Savanna biome is part of a larger grassland biome and is mainly made up of flat grassland vegetation.
Correct answer: Rainfall is up to 200 cm per year- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: Parasite is an organism that lives in or on an organism of another specie (its host) and benefits by deriving nutrients at the other's…
Correct answer: Option B- A. Unidirectional
- B. Tridirectional
- C. Multidirectional
- D. Bidirectional
Explanation: The correct answer is "Unidirectional."Explanation of options:Unidirectional: This option means that the flow of energy in an ecosystem is…
Correct answer: Unidirectional- A. Totally barren lands
- B. Good pastured lands
- C. Salinity
- D. Rocky areas
Explanation: Overgrazing refers to the excessive grazing of an area by livestock, which leads to the depletion of vegetation and soil erosion.
Correct answer: Totally barren lands- A. Nitrate ions and ammonia
- B. Atomic nitrogen
- C. Urea
- D. All of these
Explanation: In nitrogen fixation, nitrogen is converted to Nitrate ions and ammonia.
Correct answer: Nitrate ions and ammonia- A. Decomposers
- B. Primary consumer
- C. Secondary consumer
- D. Producers
- E. Herbivores
Explanation: Option A: Decomposers break down dead organic matter and waste materials, playing a crucial role in nutrient recycling.
Correct answer: Producers- A. Climax community
- B. Pioneer succession
- C. Primary succession
- D. Secondary succession
Explanation: Secondary succession occurs when the primary ecosystem gets destroyed. For example, a climax community gets destroyed by fire.
Correct answer: Secondary succession- A. Fossils
- B. Impression
- C. Ancient prints
- D. Ancient cast
Explanation: Fossils are the preserved remains, or traces of remains, of ancient organisms.
Correct answer: Fossils- A. Rhodospirillum - Mycorrhiza
- B. Anabaena - Nitrogen fixer
- C. Rhizobium - Alfalfa
- D. Frankia - Alnus
Explanation: Rhodospirillum is a free-living nitrogen-fixing bacteria. Mycorrhiza is the symbiotic association between fungi and roots of higher…
Correct answer: Rhodospirillum - Mycorrhiza- A. Secondary treatment
- B. Primary treatment
- C. Sludge treatment
- D. Tertiary treatment
Explanation: Primary or physical treatment is the process of removal of small and large, floating and suspended solids from sewage through two…
Correct answer: Primary treatment