02 December Static Quiz 2021
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02 December 2021 – Current Affairs Quiz for UPSC Prelims
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- Question 1 of 5
1. Question
With reference to the concepts in Ecology, the term ‘Autecology’ refers to?
CorrectAutecology: The study of relationship of individual species with the environment.
IncorrectAutecology: The study of relationship of individual species with the environment.
- Question 2 of 5
2. Question
Consider the following statements with reference to food chain and food web?
1) A food chain is a basic network in which an organism of higher trophic level has access to more members of a lower trophic level.
2) A food web has a role in improving the adaptability and competitiveness of an organism.
Which of the above statements is/are correct?CorrectA food chain is a basic network that shows the linear flow of nutrients and energy from one trophic level to another. A food web is a multitude of food chains that are interconnected at many trophic levels. Hence statement 1 is incorrect.
A food web accurately represents all the various food chains that exist in an ecosystem. It has a role in improving the adaptability and competitiveness of an organism. Hence statement 2 is correct.
IncorrectA food chain is a basic network that shows the linear flow of nutrients and energy from one trophic level to another. A food web is a multitude of food chains that are interconnected at many trophic levels. Hence statement 1 is incorrect.
A food web accurately represents all the various food chains that exist in an ecosystem. It has a role in improving the adaptability and competitiveness of an organism. Hence statement 2 is correct.
- Question 3 of 5
3. Question
Consider the following statements:
1) Pyramid of biomass is inverted in the aquatic systems
2) Pyramid of Energy will always be upright
3) Pyramid of numbers in a Pond Ecosystem is inverted.
Which of the above statements is/are incorrect?CorrectPyramid of Biomass in Aquatic Ecosystems: In the aquatic system, the biomass can increase at higher trophic levels. For example, in Oceans, the food chain typically starts with phytoplankton and ends at predatory fish, which has largest biomass. Thus, the pyramid of biomass is inverted in the aquatic systems including marine, ponds etc. Hence statement 1 is correct.
Pyramid of Energy: A graphic representation of the amount of energy trapped per unit time and area in different trophic levels of a food chain. It is always upright as there will be loss of energy from one trophic to next trophic level. Hence statement 2 is correct.
Pyramid of Numbers in Pond Ecosystem: In a pond ecosystem, the producers are Phyto-planktons such as algae, bacteria etc. They are maximum in number. The small herbivorous fishes, rotifers etc. are smaller in number than producers, while the small carnivorous fishes are even less in number. Finally, the apex consumers or biggest carnivorous fishes are least in number. Thus, the Pyramid of numbers in a Pond Ecosystem is also upright. Hence statement 3 is incorrect.
IncorrectPyramid of Biomass in Aquatic Ecosystems: In the aquatic system, the biomass can increase at higher trophic levels. For example, in Oceans, the food chain typically starts with phytoplankton and ends at predatory fish, which has largest biomass. Thus, the pyramid of biomass is inverted in the aquatic systems including marine, ponds etc. Hence statement 1 is correct.
Pyramid of Energy: A graphic representation of the amount of energy trapped per unit time and area in different trophic levels of a food chain. It is always upright as there will be loss of energy from one trophic to next trophic level. Hence statement 2 is correct.
Pyramid of Numbers in Pond Ecosystem: In a pond ecosystem, the producers are Phyto-planktons such as algae, bacteria etc. They are maximum in number. The small herbivorous fishes, rotifers etc. are smaller in number than producers, while the small carnivorous fishes are even less in number. Finally, the apex consumers or biggest carnivorous fishes are least in number. Thus, the Pyramid of numbers in a Pond Ecosystem is also upright. Hence statement 3 is incorrect.
- Question 4 of 5
4. Question
Which among the following are conditions for Biomagnification to occur?
1) Pollutants must be Long lived
2) It must be stable and mobile
3) Soluble in water
4) Biologically active
Which of the above statements is/are correct?CorrectBiomagnification is the tendency of pollutants to concentrate as they move from one trophic level to the next.
4 conditions for Biomagnification:
Pollutants must be Long lived,
Stable and mobile,
Soluble in fats,
Biologically active. Ex: DDT, Hexa-chloro benzene, Polychlorinated biphenyl, Toxaphene, Methyl mercury, Agricultural pesticidesIncorrectBiomagnification is the tendency of pollutants to concentrate as they move from one trophic level to the next.
4 conditions for Biomagnification:
Pollutants must be Long lived,
Stable and mobile,
Soluble in fats,
Biologically active. Ex: DDT, Hexa-chloro benzene, Polychlorinated biphenyl, Toxaphene, Methyl mercury, Agricultural pesticides - Question 5 of 5
5. Question
With reference to the Biological interactions, the relationship between trees and epiphytic plants are referred to as?
CorrectCommensalism: Cow dung provides food and shelter to dung beetles. The beetles have no effect on the cow.
Suckerfish often attaches to a shark. This helps the suckerfish get protection, a free ride as well as a meal from the leftover of the shark’s meal.
The shark does not, however, get any benefit nor is it adversely affected by this association.IncorrectCommensalism: Cow dung provides food and shelter to dung beetles. The beetles have no effect on the cow.
Suckerfish often attaches to a shark. This helps the suckerfish get protection, a free ride as well as a meal from the leftover of the shark’s meal.
The shark does not, however, get any benefit nor is it adversely affected by this association.
