19107.Xeric environment is characterized by
High precipitation
Low atmospheric humidity
Extremes of temperatures
High rate of vaporization
19108.Which of the following statements is correct?
Least productive ecosystem is desert and deep lake
Sugarcane is the most productive agroecosystem
Most productive ecosystem is coral reef
All the above
19109.Pyramid of energy in ecosystems is
Always upright
Always inverted
Mostly upright
Mostly inverted
19110.Which one of the following is correct matching of a plant, its habit and the forest type where it normally occurs?
Prosopis, tree, scrub
Saccharum, grass, forest
Shorea robusta, herb, tropical rain forest
Acacia catechu, tree, coniferous forest
19111.The pyramid of energy is always upright for any ecosystem. This situation indicates the fact that
Herbivores have a better energy conversion efficiency than carnivores.
Producers have the lowest energy conversion efficiency.
Carnivores have better energy conversion efficiency than herbivores.
Energy conversion efficiency is the same in all trophic levels.
19112.Study the following lists:
| List – I | List – II | ||
|---|---|---|---|
| A. | Population | I. | Part of the earth consisting of all the ecosystems of the world |
| B. | Community | II. | Assemblage of all the individuals belonging to different species occurring in an area |
| C. | Ecosystem | III. | Group of similar individuals belonging to the same species found in an area |
| D. | Ecosphere | IV. | Interaction between the living organisms and their physical environmental components |
| V. | Classification of organisms based on the type of environment. | ||
A - I, B - IV, C - V, D - III
A - V, B - II, C - III, D - I
A - II, B - III, C - V, D - IV
A - III, B - II, C - IV, D - I
19114.In an aquatic ecosystem, the trophic level equivalent to cows in grasslands is
Nekton
Zooplankton
Phytoplankton
Benthos
19115.
Assertion: A network of food chains existing together in an ecosystem is known as a food web.
Reason: An animal like kite cannot be a part of a food web.
The correct answer is:Both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
Both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.
Assertion is true statement but Reason is false.
Both Assertion and Reason are false statements.
19116.Which of the following groups is absolutely essential functional component of the ecosystem?
Producers
Producers and herbivores
Producers and detritivores
Detritivores