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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382 questions · page 34 of 39
331. What is the niche of an organism in an ecosystem?
- A. Role played by many organisms in an ecosystem
- B. Role played by a dead organism in an ecosystem
- C. Role played by community of microorganisms in their ecosystem
- D. Role played by an organism in its ecosystem
Explanation: The niche of an organism is the role that it plays in a community, especially its living conditions and its interaction with other organisms in the community, and also its behavior and influence.
Correct answer: Role played by an organism in its ecosystem332. The distinct levels or links of food chain are called
- A. Trophic level
- B. Food web
- C. Energy pyramid
- D. Food chain
Explanation: A trophic level refers to a level or a position in a food chain, a food web, or an ecological pyramid.
Correct answer: Trophic level333. A relationship between two or more organisms of different species in which all partners get benefit is called
- A. Symbiosis
- B. Parasitism
- C. Commensalism
- D. Predation
Explanation: Symbiosis is the interaction of two dissimilar organisms, in which both organisms benefit from the interaction.
Correct answer: Symbiosis334. Population of different species (plants and animals) living in the same habitat form a:
- A. Community
- B. Ecosystem
- C. Biosphere
- D. Microhabitat
Explanation: A community is a group of interacting species, which live in the same location.
Correct answer: Community335. Living part of ecosystem is:
- A. Lithosphere
- B. Hydrosphere
- C. Community
- D. Biosphere
Explanation: The biosphere is the part of an ecosystem which integrates all living organisms and their relationship with one another.
Correct answer: Biosphere336. A living association between two living organisms of different species that is beneficial to both partners is called:
- A. Commensalism
- B. Parasitism
- C. Mutualism
- D. Predation
Explanation: A symbiotic relationship, or symbiosis, is a close and long-term biological interaction between two different species. The relationship can be categorized into three main types: mutualism, where both species benefit; commensalism, where one benefits and the other is unharmed; and parasitism, where one benefits at the expense of the other.
Correct answer: Mutualism337. Individual successions are known as
- A. Primary successions
- B. Secondary successions
- C. Seres
- D. Xeroses
Explanation: The term specifically used for each individual succession in animal or plant is called seres. Therefore this is the right option here.
Correct answer: Seres338. Which one of the following is the ultimate distributional unit within which a species is restrained by the limitations of its physical structure and physiology?
- A. Niche
- B. Biome
- C. Ecosystem
- D. Habitat
Explanation: The given statement is the definition of Niche given by Grinnell. Therefore opt A is the right choice here.
Correct answer: Niche339. All herbivores belong to which trophic level in the food chain?
- A. T1
- B. T2
- C. T3
- D. T4
Explanation: Herbivores which are the primary consumers belong to trophic level 2.
Correct answer: T2340. How many food chains are present in the following food web?
- A. 5
- B. 3
- C. 6
- D. 4
Explanation: A series of organisms each dependent on the next as a source of food is called a food chain. Food web A system of interlocking and interdependent food chains. There are four food chains in the given food web.
Correct answer: 4