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Question 1 of 5
1. Question
1 pointsConsider the following statements regarding Ocean deoxygenation.
1. Ocean deoxygenation is the maximum reduction of oxygen minimum zones in the world’s oceans as a consequence of anthropogenic emissions of carbon dioxide.
2. Oxygen is less soluble in warmer water.
3. The areas of Sea water that is depleted of dissolved oxygen is called Anoxic waters.
How many of the above statements is/are correct?Correct
2 and 3 are correct.
Ocean deoxygenation is the expansion of oxygen minimum zones in the world’s oceans as a consequence of anthropogenic emissions of carbon dioxide. The change has been fairly rapid and poses a threat to fish and other types of marine life, as well as to people who depend on marine life for nutrition or livelihood. Ocean deoxygenation poses implications for ocean productivity, nutrient cycling, carbon cycling, and marine habitats.
Most of the excess heat from CO2 and other greenhouse gas emissions is absorbed by the oceans. Warmer oceans cause deoxygenation both because oxygen is less soluble in warmer water, and through temperature driven stratification of the ocean which inhibits the production of oxygen from photosynthesis. Anoxic waters are areas of sea water, fresh water, or groundwater that are depleted of dissolved oxygen and are a more severe condition of hypoxia.Incorrect
2 and 3 are correct.
Ocean deoxygenation is the expansion of oxygen minimum zones in the world’s oceans as a consequence of anthropogenic emissions of carbon dioxide. The change has been fairly rapid and poses a threat to fish and other types of marine life, as well as to people who depend on marine life for nutrition or livelihood. Ocean deoxygenation poses implications for ocean productivity, nutrient cycling, carbon cycling, and marine habitats.
Most of the excess heat from CO2 and other greenhouse gas emissions is absorbed by the oceans. Warmer oceans cause deoxygenation both because oxygen is less soluble in warmer water, and through temperature driven stratification of the ocean which inhibits the production of oxygen from photosynthesis. Anoxic waters are areas of sea water, fresh water, or groundwater that are depleted of dissolved oxygen and are a more severe condition of hypoxia. -
Question 2 of 5
2. Question
1 pointsLiving 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?
1. Very small animals are rarely found in polar regions.
2. Keoladeo National Park witnessing thousands of migratory birds in winter season.
3. People living at high altitudes have a higher Red Blood Cell (RBC) account than people living on the plains.
Select the correct answer codeCorrect
All the above are the ecological adaptations of living organisms to survive better against hostile conditions like freezing temperature, high altitude etc.
Incorrect
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 3 of 5
3. Question
1 pointsWhat would happen if phytoplankton of an ocean is completely destroyed for some reason?
1. The ocean as a carbon sink would be adversely affected.
2. The density of ocean water would drastically increase.
3. The food chains in the ocean would be adversely affected.
Which of the above statements is/are correct?Correct
Phytoplanktons are food factories of the ocean, it fixes atmospheric carbon dioxide in large quantities (Carbon Sink) and produce food. So, if phytoplanktons are removed completely it leads to catastrophic failure of ocean ecosystem. It doesn’t influence the density of ocean water.
Incorrect
Phytoplanktons are food factories of the ocean, it fixes atmospheric carbon dioxide in large quantities (Carbon Sink) and produce food. So, if phytoplanktons are removed completely it leads to catastrophic failure of ocean ecosystem. It doesn’t influence the density of ocean water.
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Question 4 of 5
4. Question
1 pointsConsider the following statements regarding Irrawaddy dolphins.
1. Of the six varieties of dolphins that are found in India’s rivers, lakes and around coastline, the Irrawaddy Dolphins are among the highest in number.
2. The Irrawaddy Dolphins are found mostly in brackish water zones.
3. In India, Irrawaddy Dolphins are found mainly in Chilika Lake.
How many of the above statements is/are correct?Correct
2 and 3 are correct.
Of the six varieties of dolphins that are found in India’s rivers, lakes and around coastline, the Irrawaddy Dolphins are among the lowest in number.
The Gangetic river dolphins are freshwater species that are found in the Sundarban river system and Brahmaputra rivers. On the other hand, the Irrawaddy Dolphins are found mostly in brackish water zones and that too in Chilika.
At least 146 endangered Irrawaddy Dolphins were sighted in Odisha’s Chilika lake during the annual dolphin census conducted by the state’s forest department.
The Irrawaddy Dolphin (Orcaella brevirostris) is the flagship species of Chilika lake. Chilika is home to the only known population of Irrawaddy Dolphins in India. One of only two lagoons in the world is home to this species — Irrawaddy Dolphins.Incorrect
2 and 3 are correct.
Of the six varieties of dolphins that are found in India’s rivers, lakes and around coastline, the Irrawaddy Dolphins are among the lowest in number.
The Gangetic river dolphins are freshwater species that are found in the Sundarban river system and Brahmaputra rivers. On the other hand, the Irrawaddy Dolphins are found mostly in brackish water zones and that too in Chilika.
At least 146 endangered Irrawaddy Dolphins were sighted in Odisha’s Chilika lake during the annual dolphin census conducted by the state’s forest department.
The Irrawaddy Dolphin (Orcaella brevirostris) is the flagship species of Chilika lake. Chilika is home to the only known population of Irrawaddy Dolphins in India. One of only two lagoons in the world is home to this species — Irrawaddy Dolphins. -
Question 5 of 5
5. Question
1 pointsWhich of the following are the Ozone depleting substances?
1. Hydrobromoflurocarbons (HBFCs)
2. Halons
3. Methyl bromide
4. Carbon tetrachloride
5. Methyl chloroform
Select the correct answer codeCorrect
Ozone depleting substances include:
• chlorofluorocarbons (CFCs)
• hydrochlorofluorocarbons (HCFCs)
• hydrobromoflurocarbons (HBFCs)
• halons
• methyl bromide
• carbon tetrachloride
• methyl chloroform.Incorrect
Ozone depleting substances include:
• chlorofluorocarbons (CFCs)
• hydrochlorofluorocarbons (HCFCs)
• hydrobromoflurocarbons (HBFCs)
• halons
• methyl bromide
• carbon tetrachloride
• methyl chloroform.
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