INSIGHTS STATIC QUIZ 2020 - 21
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Question 1 of 5
1. Question
Which of the following have low Albedo?
Correct
Solution: c)
Surface Albedo
Fresh asphalt 0.04
Bare soil 0.17
Desert sand 0.40
Ocean ice 0.5 – 0.7
Incorrect
Solution: c)
Surface Albedo
Fresh asphalt 0.04
Bare soil 0.17
Desert sand 0.40
Ocean ice 0.5 – 0.7
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Question 2 of 5
2. Question
Consider the following statements regarding food chain in ecosystem:
- In an aquatic ecosystem, more energy flows through grazing food chain than detritus food chain.
- In a terrestrial ecosystem larger fraction of energy flow through detritus food chain than grazing food chain.
- Only 10% of energy is lost in energy flow across different trophic levels.
Which of the above statements is/are correct?
Correct
Solution: a)
In an aquatic ecosystem, grazing food chain is the major conduit for energy flow. As against this, in a terrestrial ecosystem, a much larger fraction of energy flows through the detritus food chain than through the grazing food chain.
When energy is passed in an ecosystem from one trophic level to the next, only ten percent of the energy will be passed. Around 90% of energy will be lost.
Incorrect
Solution: a)
In an aquatic ecosystem, grazing food chain is the major conduit for energy flow. As against this, in a terrestrial ecosystem, a much larger fraction of energy flows through the detritus food chain than through the grazing food chain.
When energy is passed in an ecosystem from one trophic level to the next, only ten percent of the energy will be passed. Around 90% of energy will be lost.
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Question 3 of 5
3. Question
Eutrophication of a water body necessarily involves
- Gradual heating of the water body
- Inflow of nutrients in the water body
- Calcification of bed deposits
Select the correct answer code:
Correct
Solution: c)
Eutrophication is the process by which a body of water acquires a high concentration of nutrients, especially phosphates and nitrates.
These typically promote excessive growth of algae. As the algae die and decompose, high levels of organic matter and the decomposing organisms deplete the water of available oxygen, causing the death of other organisms, such as fish.
Heated Industrial effluents increase the temperature of the water body and typically decrease the level of dissolved oxygen of water. This can harm aquatic animals such as fish, amphibians and other aquatic organisms. But, this is not necessary with Eutrophication.
Eutrophication is a natural, slow-aging process for a water body, but human activity (industrial effluents for e.g.) greatly speeds up the process.
Incorrect
Solution: c)
Eutrophication is the process by which a body of water acquires a high concentration of nutrients, especially phosphates and nitrates.
These typically promote excessive growth of algae. As the algae die and decompose, high levels of organic matter and the decomposing organisms deplete the water of available oxygen, causing the death of other organisms, such as fish.
Heated Industrial effluents increase the temperature of the water body and typically decrease the level of dissolved oxygen of water. This can harm aquatic animals such as fish, amphibians and other aquatic organisms. But, this is not necessary with Eutrophication.
Eutrophication is a natural, slow-aging process for a water body, but human activity (industrial effluents for e.g.) greatly speeds up the process.
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Question 4 of 5
4. Question
Which of the following is most likely to survive in deep ocean waters?
Correct
Solution: b)
Light is a limiting factor for life in deep oceans. Not all the colour components of the visible spectrum are available for marine plants living at different depths of the ocean.
Sunlight is broken into its seven component colours as it penetrates through the ocean water by dispersion. Longer wavelengths cannot penetrate deeper whereas shorter wavelengths do.
Algae use photosynthesis to manufacture food. So, the ones utilizing the short wavelength for photosynthesis survive.
Red algae have red pigment (phycoerythrin) which carries out photosynthesis using only short wavelength light found in greater depths.
They can be found as deep as 200 m in ocean water.
Incorrect
Solution: b)
Light is a limiting factor for life in deep oceans. Not all the colour components of the visible spectrum are available for marine plants living at different depths of the ocean.
Sunlight is broken into its seven component colours as it penetrates through the ocean water by dispersion. Longer wavelengths cannot penetrate deeper whereas shorter wavelengths do.
Algae use photosynthesis to manufacture food. So, the ones utilizing the short wavelength for photosynthesis survive.
Red algae have red pigment (phycoerythrin) which carries out photosynthesis using only short wavelength light found in greater depths.
They can be found as deep as 200 m in ocean water.
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Question 5 of 5
5. Question
Increased Snow cover on a water body can lead to
- Sudden spurt in phytoplankton population which are not dependent on photosynthesis
- Improved oxygen exchange and nutrient recycling in the lake
- A condition of winterkill causing large scale death of fishes and organisms
Select the correct answer code:
Correct
Solution: b)
Phytoplankton float on top surface of water bodies and require sunlight to thrive. Ice cover will reduce their breeding grounds and population.
The snow cover blocks exchange of nutrients and oxygen from the atmosphere.
Snow cover of ice on water body can effectively cut off light, plunging the waters into darkness.
Hence photosynthesis stops but respiration continues. Thus, in shallow lakes, oxygen gets depleted, and due to lack of oxygen there is large scale death of fishes and other organisms. This condition is known as winterkill.
Incorrect
Solution: b)
Phytoplankton float on top surface of water bodies and require sunlight to thrive. Ice cover will reduce their breeding grounds and population.
The snow cover blocks exchange of nutrients and oxygen from the atmosphere.
Snow cover of ice on water body can effectively cut off light, plunging the waters into darkness.
Hence photosynthesis stops but respiration continues. Thus, in shallow lakes, oxygen gets depleted, and due to lack of oxygen there is large scale death of fishes and other organisms. This condition is known as winterkill.
