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Question 1 of 5
1. Question
1 pointsThe largest human source of carbon dioxide emissions is from
Correct
Nearly 87 percent of all human-produced carbon dioxide emissions come from the burning of fossil fuels like coal, natural gas and oil.
The remainder results from the clearing of forests and other land use changes (9%), as well as some industrial processes such as cement manufacturing (4%).Incorrect
Nearly 87 percent of all human-produced carbon dioxide emissions come from the burning of fossil fuels like coal, natural gas and oil.
The remainder results from the clearing of forests and other land use changes (9%), as well as some industrial processes such as cement manufacturing (4%). -
Question 2 of 5
2. Question
1 pointsThe primary productivity of the tropical rain forest is lower when compared to that of the temperate forests. This is because of
Correct
Option a is correct.
The soil is poor in nutrients and acidic due to frequent leaching by heavy rains. Frequent rains wash away the top soil leaving only certain mineral and organic remains. So, if these forests are cleared, it will not yield tremendous vegetation growth as seen in tropical forests for a long time.
However, rainforests are also notable for replenishing the soil quickly with dead organic matter (e.g. leafs that fall from trees).Incorrect
Option a is correct.
The soil is poor in nutrients and acidic due to frequent leaching by heavy rains. Frequent rains wash away the top soil leaving only certain mineral and organic remains. So, if these forests are cleared, it will not yield tremendous vegetation growth as seen in tropical forests for a long time.
However, rainforests are also notable for replenishing the soil quickly with dead organic matter (e.g. leafs that fall from trees). -
Question 3 of 5
3. Question
1 pointsWhich of the following conditions generally lead to coral bleaching?
1. Low sedimentation of ocean beds
2. Unusually warm ocean water
3. Acidification of oceans
Select the correct answer codeCorrect
2 and 3 are correct.
Coral bleaching causes corals to expel tiny photosynthetic algae, draining them of their colour. It calcifies the corals to turn into white. Algae are vital to the coral, which uses the organic products of photosynthesis to help it grow. The loss of algae makes it vulnerable to disease and it will eventually die. When a coral bleaches, it is not dead.
Conditions required for growth of corals are warm tropical oceans with minimum temperature of 20 degree; transparent parts of ocean bodies; Oceanic water must be free of sedimentation; it should have relatively low salinity etc. When these conditions are vitiated it may lead to coral bleaching.Incorrect
2 and 3 are correct.
Coral bleaching causes corals to expel tiny photosynthetic algae, draining them of their colour. It calcifies the corals to turn into white. Algae are vital to the coral, which uses the organic products of photosynthesis to help it grow. The loss of algae makes it vulnerable to disease and it will eventually die. When a coral bleaches, it is not dead.
Conditions required for growth of corals are warm tropical oceans with minimum temperature of 20 degree; transparent parts of ocean bodies; Oceanic water must be free of sedimentation; it should have relatively low salinity etc. When these conditions are vitiated it may lead to coral bleaching. -
Question 4 of 5
4. Question
1 pointsWhat is/are the contributions of Coral Reefs to an ecosystem?
1. These support fish production by providing them with food and shelter.
2. They control the concentration of carbon dioxide in the lower atmosphere and in the sea water.
3. They check sea waves against going towards sea coasts.
4. They have the highest primary productivity amongst all ecosystems.
Select the correct answer codeCorrect
1, 2 and 3 are correct.
The excess CO2 is used for calcification of reefs and in this way the additional CO2 is taken care of. So, coral reefs are helpful in controlling Green House Effect as they absorb carom dioxide.
They usually form the first barrier against a tsunami or cyclone or sea waves by blocking the force of the wave. They have the highest primary productivity within the sea, not outside. Amongst all, estuaries are the one with the highest primary productivity.Incorrect
1, 2 and 3 are correct.
The excess CO2 is used for calcification of reefs and in this way the additional CO2 is taken care of. So, coral reefs are helpful in controlling Green House Effect as they absorb carom dioxide.
They usually form the first barrier against a tsunami or cyclone or sea waves by blocking the force of the wave. They have the highest primary productivity within the sea, not outside. Amongst all, estuaries are the one with the highest primary productivity. -
Question 5 of 5
5. Question
1 pointsConsider the following statements regarding the application of algae.
1. Used to make Biodiesel and Bioethanol.
2. It is a complete protein with essential amino acids.
3. Used as fertilizers and soil conditioners.
4. Used in Wastewater Treatment.
Which of the above statements is/are correct?Correct
1, 2, 3 and 4 are correct.
Algae can be used to make Biodiesel and Bioethanol.
It is a complete protein with essential amino acids (unlike most plant foods) that are involved in major metabolic processes such as energy and enzyme production.
They are used as fertilizers, soil conditioners and are a source of livestock feed. Algae are used in Wastewater Treatment facilities, reducing the need for greater amounts of toxic chemicals than are already used.
Algae can be used to capture fertilizers in runoff from farms.Incorrect
1, 2, 3 and 4 are correct.
Algae can be used to make Biodiesel and Bioethanol.
It is a complete protein with essential amino acids (unlike most plant foods) that are involved in major metabolic processes such as energy and enzyme production.
They are used as fertilizers, soil conditioners and are a source of livestock feed. Algae are used in Wastewater Treatment facilities, reducing the need for greater amounts of toxic chemicals than are already used.
Algae can be used to capture fertilizers in runoff from farms.
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