Free Man and His Environment MCQs with Answers

• 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…

• 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.

• 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.

• 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…

• 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.

• 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.

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

Explanation: The swelling of dead bodies in water is primarily due to the process of decomposition.

• 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.

• 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…

• 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.

• A. Foliose lichens
• B. Crustose lichens
• C. Fruticose lichens
• D. Climax stage

Explanation: Due to great exposure to the sun and extreme deficiency of water, the first pioneers in the bare rock area are a few simple organisms.

• A. Always unidirectional
• B. Always bidirectional
• C. In any direction
• D. Always down directional

Explanation: In an ecosystem, energy flows in a unidirectional manner, primarily from producers (such as plants) to consumers (such as herbivores…

• A. Density
• B. Natality
• C. Mortality
• D. Dispersion

Explanation: Natality refers to the rate at which new individuals are added to a population in a unit of time. It is also known as birth rate.

• A. Sand
• B. Water
• C. Forest floor
• D. Bare rocks

Explanation: Lithosere is a specific type of ecological succession that occurs on bare rocks.

• A. Hydroelectric power
• B. Nuclear power
• C. Solar energy
• D. Fossil fuels

Explanation: Fuels that are generated very deep under the earth from the debris of plants and animals, which existed millions of years ago, are called…

• A. Mechanical forming
• B. Improved crop varieties
• C. Continuous photosynthesis
• D. Pest control

Explanation: Food is considered a renewable resource primarily because of continuous photosynthesis, which allows plants to convert sunlight into…

• A. Carolers forming
• B. Extensive ploughing
• C. Moderate grazing
• D. Heavy grazing

Explanation: Moderate grazing refers to controlled or balanced grazing practices where the number of livestock and their grazing duration are managed…

• A. Methane
• B. Sulpher dioxide
• C. Nitrogen dioxide
• D. Ethane

Explanation: Solid wastes are biologically converted into value added products by physiological action of microorganisms.

• A. Forests
• B. Iron
• C. Petroleum
• D. Natural gas

Explanation: Forests are not considered non-renewable resources of energy. Forests have various uses and can provide energy through biomass, they are…

• A. troposphere
• B. stratosphere
• C. mesosphere
• D. atmosphere

Explanation: Ozone Layer: It is a thin part of Earth's atmosphere that absorbs almost all of the sun's harmful ultraviolet light.