Free Ecosystems MCQs with Answers

31. Pick the biotic component from the following.

• A. Soil
• B. Atmosphere
• C. Water
• D. Animals

Explanation: d) Animals: This is the correct option. Animals are biotic components of the environment. They are living organisms that interact with other biotic and abiotic components, contributing to the overall ecosystem dynamics.

32. In _ zone the light is insufficient to support photosynthesis.

• A. Desert.
• B. Littoral.
• C. Profundal.
• D. All of these.

Explanation: The profundal zone is a deep zone of an inland body of freestanding water, such as a lake or a pond, located below the range of effective light penetration.

33. The nutrient cycles are also called:

• A. Biogeochemical cycles
• B. Bioelement cycles
• C. Biochemical cycles
• D. Geochemical cycles

Explanation: Explanation:The nutrient cycles are primarily referred to as "Biogeochemical cycles" because they involve the cycling of nutrients such as carbon, nitrogen, phosphorus, and other elements through biological, geological, and chemical processes in the environment.This option is incorrect because the term "Bioelement" is not commonly used to refer to nutrients or chemical elements in the context of nutrient cycling.This option is also incorrect because biochemical reactions do occur in nutrient cycling, the term does not accurately describe the cycling of nutrients through ecosystems.This option is also incorrect because nutrient cycling does involve geological processes, it also involves biological and chemical processes that are not included in the term "Geochemical cycles"

34. Group of interbreeding individuals of particular species, sharing common geographical area is called:

• A. Population
• B. Community ecology
• C. Community
• D. Autecology

Explanation: [A] Correct definition for population[B] Community ecology;community ecology, study of the organisation and functioning of communities, which are assemblages of interacting populations of the species living within a particular area or habitat. [C] Community;all population within ecosystem are now as community[D]Autecology;study of a particular species

35. The typical environment of a particular organism population community is called:

• A. Niche
• B. Ecosystem
• C. Habitat
• D. Biosphere

Explanation: A habitat is a place where an organism makes its home. A habitat meets all the environmental conditions an organism needs to survive.

36. In an ecosystem, mycorrhizae is an example of:

• A. Symbiosis
• B. Predation
• C. Commensalism
• D. Parasitism

Explanation: Mycorrhiza is a mutualistic relationship between fungal hyphae and roots of higher plants.

37. Successive stages of eating and being eaten by which recycling of materials and flow of energy takes place is called:

• A. Food Chain
• B. Food Web
• C. Trophic Level
• D. Food Link

Explanation: A food chain is a linear sequence of organisms through which nutrients and energy pass as one organism eats another; the levels in the food chain are producers, primary consumers, higher-level consumers, and finally decomposers. These levels are used to describe ecosystem structure and dynamics.

38. 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.

39. 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.

40. 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.