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Question 1 of 5
1. Question
Consider the following statements.
- Ecosystem is formed by the interaction of both biotic and abiotic factors.
- Ecosystem is larger than biome and contain many biomes.
Which of the above statements is/are correct?
Correct
Solution: a)
An ecosystem is a system formed by the interaction of all living organisms (biotic) with each other and with the physical and chemical factors (abiotic) of the environment in which they live, all linked by the transfer of energy and material.
Biome is a larger region than an ecosystem and comprises many such ecosystems.
Incorrect
Solution: a)
An ecosystem is a system formed by the interaction of all living organisms (biotic) with each other and with the physical and chemical factors (abiotic) of the environment in which they live, all linked by the transfer of energy and material.
Biome is a larger region than an ecosystem and comprises many such ecosystems.
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Question 2 of 5
2. Question
Arrange the following ecosystems in the decreasing order of biomass productivity (g per metre square per year).
- Tropical Rainforests
- Cultivated lands
- Coral reefs
- Swamps and marshes
Select the correct answer code:
Correct
Solution: c)
Incorrect
Solution: c)
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Question 3 of 5
3. Question
Living organisms respond in different ways to the abiotic stressful conditions like temperature, altitude etc. In this context, which of the following are examples of the adaptation?
- Keoladeo National Park witnessing thousands of migratory birds in winter season.
- Very small animals are rarely found in polar regions.
- People living at high altitudes have a higher Red Blood Cell (RBC) account than people living on the plains.
Select the correct answer code:
Correct
Solution: d)
All the above are the ecological adaptations of living organisms to survive better against hostile conditions like freezing temperature, high altitude etc.,
Incorrect
Solution: d)
All the above are the ecological adaptations of living organisms to survive better against hostile conditions like freezing temperature, high altitude etc.,
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Question 4 of 5
4. Question
Lichen is a pioneer species. What do you understand by this statement?
Correct
Solution: c)
Lichens are typically the first organisms to colonize bare rock. They are therefore the pioneer species in primary succession.
Many organisms require soil before they can colonize an area. Lichens that colonize bare rock secrete acids that break down the rock and start the soil-production process. Also, as lichens die, they provide some organic matter that also contributes to soil. Mosses can then colonize the thin soil; as mosses die, the soil thickens more allowing other hardy species to colonize. The process continues until a mature forest forms, sometimes centuries later.
Incorrect
Solution: c)
Lichens are typically the first organisms to colonize bare rock. They are therefore the pioneer species in primary succession.
Many organisms require soil before they can colonize an area. Lichens that colonize bare rock secrete acids that break down the rock and start the soil-production process. Also, as lichens die, they provide some organic matter that also contributes to soil. Mosses can then colonize the thin soil; as mosses die, the soil thickens more allowing other hardy species to colonize. The process continues until a mature forest forms, sometimes centuries later.
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Question 5 of 5
5. Question
Which of the following ecological pyramids is/are upright in pond ecosystem?
- Pyramid of number
- Pyramid of biomass
- Pyramid of energy
Select the correct answer code:
Correct
Solution: b)
Pyramid of energy and number is upright in pond ecosystem. Pyramid of biomass is inverted in an aquatic ecosystem because the biomass of fishes far exceeds the biomass of phytoplanktons.
Incorrect
Solution: b)
Pyramid of energy and number is upright in pond ecosystem. Pyramid of biomass is inverted in an aquatic ecosystem because the biomass of fishes far exceeds the biomass of phytoplanktons.
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