Environmental Science - Study Mode
[#86] Which of the following statements regarding species interdependence are true? A. An association of two species where one is benefitted and other remains unaffected called mutualism B. An interspecific association where both partners derive benefit from each other is called commensalism C. A direct food relation between two species of animals in which one animals kills and feed on another is referred as predation D. A relationship between two species of organism where both the partners are benefitted from each other is called symbiosis
Correct Answer
(B) C and D only
Explanation
Solution: A direct food relation between two species of animals in which one animals kills and feed on another is referred as predation and a relationship between two species of organism where both the partners are benefitted from each other is called symbiosis are true.
[#87] Where cold surface air replaces warm air, the boundary separating the different bodies of air is:
Correct Answer
(C) A cold front
Explanation
Solution: An air mass is a large body of air that has similar moisture (density) and temperature characteristics. A front is a transition zone between two air masses. A cold front is a warm-cold air boundary with the colder air replacing the warmer.
[#88] What is meant by root zone process?
Correct Answer
(C) A control measure to prevent soil pollution
Explanation
Solution: A process by which roots of plants are spread on the ground. A control measure to prevent soil pollution.
[#89] Concept of ecological pyramids was proposed by
Correct Answer
(D) Charles Elton
Explanation
Solution: The concept was first introduced by Charles Elton, the pioneer British Ecologist. The bottom of an ecological pyramid is the broadest and is occupied the producers, which form the first trophic level.
[#90] _________ is a practice of clearing and burning the forest area for cultivation of crops for 3-4 years and shifting.
Correct Answer
(A) Jhum cultivation
Explanation
Solution: In India, the practice of clearing and burning the forest area for cultivation is known as jhum or jhoom. Slash-and-burn can be part of shifting cultivation, an agricultural system in which farmers routinely move from one cultivable area to another.