Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:
Assertion : Tropical rain forests are disappearing fast from developing countries such as India.
Reason : No value is attached to these forests because these are poor in biodiversity.
Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:
Assertion : Flora contains the actual account of habitat and distribution of plants of a given area.
Reason : Flora helps in correct identification.
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Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:
Assertion : Species are groups of potentially interbreeding natural populations which are isolated from other such groups. Reason : Distinctive morphological characters are displayed due to reproductive isolation.
Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:
Assertion: “The Biological Species” concept helps us to ask how species are formed.
Reason: The concept of biological species focuses our attention on the question of how reproductive isolation comes about.
Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:
Assertion : Cold deserts too exist. e.g., Tibet, Gobi.
Reason : Desert can be hot, e.g., Thar, Sahara.
Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:
Assertion : Biotic community has higher position than population in ecological hierarchy.
Reason : Population of similar individuals remains isolated in the community.
Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:
Assertion : Indo-Gangetic plains have high population density.
Reason: These have favourable climate and fertile soil.
Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:
Assertion : Living organisms are regarded as open systems.
Reason: Energy of living organisms can be lost or gained from external environment.
Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:
Assertion :Ecological equivalents possess similar types of adaptations.
Reason : Ecological niche is the total interaction of a species with environment.
Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:
Assertion : Heliophytes, generally have low photosynthetic, respiratory and metabolic activities.
Reason :This is an adaptation of heliophytes to high intensity of light.
Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:
Assertion : Leaf butterfly and stick insect show mimicry to dodge their enemies.
Reason : Mimicry is a method to acquire body colour blending with the surroundings.
Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:
Assertion : Animals adopt different strategies to survive in hostile environment.
Reason : Praying mantis is green in colour which merges with plant foliage.
Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:
Assertion : Thick cuticle is mostly present in disease resistant plants.
Reason : Disease causing agents cannot grow on cuticle and cannot invade the cuticle.
Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:
Assertion: Daphnia populations in a water body, at different seasons of a year showed marked variations in their body morphology.
Reason: Cyclomorphosis in some organisms is influenced by the variations in temperatures prevailing in their water-bodies at different seasons.
Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:
Assertion: The prickly pear cactus introduced into Australia in early 1920s caused havoc by spreading rapidly into millions of hectares of land range.
Reason: When certain exotic species are introduced into a geographical area, they become invasive and start spreading fast because the invaded land does not have the natural predators.
Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:
Assertion: Plants need the help of insects and animals for pollinating their flowers and dispersing their seeds.
Reason: Plants offer rewards in the form of pollen and nectar for pollinators and juicy and nutritious fruits for seed dispersers.
Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:
Assertion: The aquatic organisms in which the osmotic concentration and temperature of body change according to the ambient conditions of water are referred to as conformers.
Reason: These organisms are able to maintain homeostasis through thermoregulation and osmoregulation by physiological or behavioural means.
Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:
Assertion: Small sized animals are scarce in polar regions.
Reason: Small sized animals have larger surface area relative to their volume and they have to spend much energy to generate body heat through metabolism.
Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:
Assertion: The community of an ecotone commonly contains the organisms of each of the overlapping communities and in addition the organisms which are restricted to the ecotone.
Reason: The tendency for increased variety and density at community junctions is known as the edge effect.
Directions: In the following questions, astatement of assertion is followed by a statement of reason. Mark the correct choice as:
Assertion: In deep water bodies, variations intemperature of water at different depths results in thermal stratification.
Reason: In temperate lakes, cooling of surface water during autumn and warming of it during spring results in circulation of nutrients as well as oxygen, twice a year.