Free Man and His Environment MCQs with Answers

361. How much energy will be fixed by the primary carnivores?

• A. 2317 Kcal
• B. 232 kcal
• C. 1564 kcal
• D. None of above.

Explanation: The correct answer is 'None of above.' This is because as organisms move up trophic levels, there is a significant loss of energy, with only a small percentage being transferred to the next trophic level. Without specific information on the number of herbivores or primary carnivores, it is impossible to determine the exact amount of energy that will be fixed by the primary carnivores. Therefore, the correct answer is 'None of above.'

362. Corpuscular animals are active during:

• A. Night
• B. Day
• C. Twilight
• D. Spring

Explanation: Crepuscular animals are active during the twilight period, which is the time between day and night. Nocturnal animals are active during the night, diurnal animals are active during the day, and spring is a season rather than a time of day. Therefore, the correct answer is option C:Twilight.

363. Rabbits, pabulus, rats grasshoppers and grasses constitute a

• A. Habitat
• B. Biome
• C. Community
• D. Population

Explanation: A community is a group or association of populations of two or more different species occupying the same geographical area at the same time.

364. The association in which an organism gets advantage and the other suffers is called:

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

Explanation: A parasitic relationship is one in which one organism, the parasite, lives off of another organism, the host, harming it and possibly causing death.

365. Each organism has a definite functional position different from either organisms of the locally is called :

• A. Community
• B. Niche
• C. Habitat
• D. Species

Explanation: In ecology, a niche refers to the specific role or position that an organism occupies within an ecosystem. It includes the range of conditions and resources that the organism requires for survival and reproduction, as well as its interactions with other organisms in the community. The niche of an organism is defined by its unique combination of habitat requirements, behavior, and ecological interactions.

366. "The open water zone away from shore to the depth of affective light penetration and occupied by phylopplankion Iike green algae euglena etc." which of the following regions of fresh water has all these properties?

• A. Littoral
• B. Limnetic
• C. Profundal
• D. Both "a" and "b"

Explanation: It is the open water zone away from the shore and it extends up to the effective light penetration level. The limnetic zone is well-lighted (like the littoral zone) and is dominated by plankton, both phytoplankton and zooplankton. Plankton are small organisms that play a crucial role in the food chain.

367. Swelling of dead bodies in water is due to:

• A. Osmosis
• B. Diffusion
• C. Expansion
• D. Decomposition

Explanation: The swelling of dead bodies in water is primarily due to the process of decomposition. When a body is submerged in water, bacteria and other microorganisms begin to break down the tissues, releasing gases such as methane, hydrogen, and nitrogen. As the gases accumulate, they can cause the body to bloat and swell.

368. A study of communities in relation to environment is called:

• A. Social ecology
• B. Synecology
• C. Autoecology
• D. Heteroecology

Explanation: Synecology (or community ecology) refers to the study of groups of organisms in relation to their environment.

369. Bacteria living in the gut form the association of:

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

Explanation: The human gut microbiome includes trillions of commensal bacteria that offer substantial benefits to the host, including aiding digestion, promoting the development of the immune system, and occupying niches that would otherwise be available to pathogens

370. Identify the mismatch pair in the following:

• A. Cyanobacteria - primary producer
• B. Grasshopper - primary producer
• C. Fungi - Decomposer
• D. Zooplankton - secondary consumer

Explanation: Zooplankton is a primary consumer NOT a secondary consumer.