Free Man and His Environment MCQs with Answers

• A. A symbiotic relationship
• B. Ectoparasitism
• C. Endoparasitism
• D. Decomposers

Explanation: In mutualism or symbiosis, both the organisms in the association are mutually benefitted and further this association is obligatory, i.e.…

• A. They live in the same niche.
• B. They live in the same habitat
• C. Interbreeding
• D. They live in different habitats

Explanation: Species may be defined as the uniform interbreeding population of individuals which freely interbreed among themselves.

• A. Mutualism
• B. Commensalism
• C. Cooperation
• D. Co­-evolution

Explanation: Co-­evolution can occur in any interspecific relationship like symbiosis or mutualism.

• A. Allen's law
• B. Gause's hypothesis
• C. Dollo's rule
• D. Weisman's theory.

Explanation: Interspecific competition is rivalry amongst members of different species.

• A. Deciduous forests
• B. Tropical rain forests
• C. Grasslands
• D. Savannahs.

Explanation: Tropical forests are found in the tropical zones of the world and are characterized by very high temperatures with rainfall in abundance.

• A. Aquatic
• B. Fossorial
• C. Diurnal
• D. Arboreal

Explanation: Desert animals prefer to live under the surface. The animal residing either permanently or for most of life inside the burrows or under…

• A. deciduous forests
• B. evergreen forests
• C. Grass lands
• D. Thorn forests.

Explanation: Tropical shrubs or thorn forests are found in places where moisture conditions are intermediate between desert and savanna on one hand and…

• A. Temperate forests
• B. Oceanic island communities
• C. Mangroves
• D. Tropical evergreen forests

Explanation: Tropical forests are found in the tropical zone of the world and are characterized by very high temperatures with rainfall in abundance.

• A. rhizomes
• B. seeds
• C. bulbs
• D. corms.

Explanation: Therophytes are those plants that survive the winter as a seed and complete their life cycle between the spring and autumn.

• A. are submerged in an area
• B. float on the sea surface
• C. are deep dwellers in the sea
• D. are floating (free) organisms.

Explanation: Benthoic organisms are attached to or rest on the bottom sediments. Benthoic animals may be divided into filter feeders, e.g., clams and…

• A. The habitat and specific functions of a species
• B. The specific place where an organism lives
• C. The specific specie's function and its competitive power
• D. none of these.

Explanation: Niche/ecological niche is the specific part of a habitat occupied by individuals of a species which is circumscribed by its range of…

• A. Parasitism ­- intraspecific relationship
• B. Uricotelism -­ aquatic habitat
• C. Excessive perspiration ­- xeric adaptation
• D. Streamlined body ­- aquatic adaptation

Explanation: A streamlined body is a secondary aquatic adaption. It is found in animals that live permanently in water but most of them are amphibious…

• A. ecology
• B. ecosystem
• C. phytogeography
• D. ethology.

Explanation: Ecology is the branch of science which deals with the study of inter-­relationship between organisms and their environment.

• A. colony
• B. genus
• C. community
• D. species.

Explanation: The sum total of the populations of the same kind of organisms constitutes a species.

• A. a colony
• B. mutualism
• C. commensalism
• D. ammensalism.

Explanation: In mutualism or symbiosis, both the organisms in association are mutually benefitted and further this association is obligatory, i.e.…

• A. Retain nutrients
• B. Hold organic materials
• C. hold water
• D. support life.

Explanation: Soil fertility is the characteristic of soil that supports abundant plant life.

• A. texture
• B. field capacity
• C. water holding capacity
• D. flora.

Explanation: Soil particles determine its texture. The soil particles enclose living spaces in between them called a pore space.

• A. sand and zinc
• B. gravel and calcium
• C. clay and humus
• D. silt and earthworm.

Explanation: Deep black soil is productive due to a high proportion of clay and humus.

• A. Commensalism is when none of the interacting populations affect each other
• B. Symbiosis is when the interaction is useful to both the populations
• C. Symbiosis is when neither populations affect each other
• D. Commensalism is when the interaction is useful to both the populations.

Explanation: In mutualism or symbiosis, both the organisms in association are mutually benefitted and further this association is obligatory, i.e.…

• A. symbiosis
• B. parasitism
• C. commenalism
• D. protocooperation.

Explanation: Algae and fungi in a lichen show symbiotic relationship. Fungi give support to the algae, give protection and help in absorption of water…