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Question 1 of 5
1. Question
2 points
Which of the following adds/add nitrogen to the soil?
1. Excretion of urea by animals
2. Burning of coal by man
3. Death of vegetation
Select the correct answer using the codes given below:
Correct
Ans c
Burning of coal does not add nitrogen to soil, but it releases oxides of nitrogen into the
atmosphere.
Incorrect
Ans c
Burning of coal does not add nitrogen to soil, but it releases oxides of nitrogen into the
atmosphere.
Question 2 of 5
2. Question
2 points
Which one of the following statements correctly describe the reason for the aquatic
ecosystem having inverted biomass pyramids?
Correct
Ans c
Pyramid of biomass is inverted in an aquatic ecosystem because the biomass of fishes far
exceeds the biomass of phytoplankton due to the phytoplankton having short lifespan.
Incorrect
Ans c
Pyramid of biomass is inverted in an aquatic ecosystem because the biomass of fishes far
exceeds the biomass of phytoplankton due to the phytoplankton having short lifespan.
Question 3 of 5
3. Question
2 points
Which of the following statements is incorrect regarding the Carbon and the
Phosphorus Nutrient cycle?
Correct
Ans d
Carbon in the form of carbon dioxide is added to the atmosphere through combustion of
fossil fuels, burning of forest fuels, respiration and decomposition. Carbon dioxide is fixed by
plants through the process of photosynthesis. It is a rapid process. In phosphorus cycle,
there is no release of gaseous components to the atmosphere. It is a type of sedimentary
cycling. Therefore, it is a slow process.
Incorrect
Ans d
Carbon in the form of carbon dioxide is added to the atmosphere through combustion of
fossil fuels, burning of forest fuels, respiration and decomposition. Carbon dioxide is fixed by
plants through the process of photosynthesis. It is a rapid process. In phosphorus cycle,
there is no release of gaseous components to the atmosphere. It is a type of sedimentary
cycling. Therefore, it is a slow process.
Question 4 of 5
4. Question
2 points
With regard to migration of birds, which of the following statements is/are correct?
1. Birds migrate to provide healthy conditions for their offspring.
2. Amur falcons migrate from Northern China and breed in India.
3. Species migrate seasonally and it involves a return journey.
Select the correct answer using the code given below:
Correct
Ans d
Amur falcons make voyage from breeding grounds in Russia and China to winter in southern
Africa.
Incorrect
Ans d
Amur falcons make voyage from breeding grounds in Russia and China to winter in southern
Africa.
Question 5 of 5
5. Question
2 points
Consider the following statements regarding interbreeding among the organisms:
1. Organisms in the same order can produce fertile offspring but organisms in same
class cannot.
2. Speciation cannot occur without geographical separation between the members of
a species.
Which of the statements given above is/are incorrect?
Correct
Ans c
Only organism in the same species can produce fertile offspring. Organisms from the same
class can reproduce but can’t produce fertile offspring.
In sympatric speciation, groups from the same ancestral population evolve into separate
species without any geographical separation.
Incorrect
Ans c
Only organism in the same species can produce fertile offspring. Organisms from the same
class can reproduce but can’t produce fertile offspring.
In sympatric speciation, groups from the same ancestral population evolve into separate
species without any geographical separation.
