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Consider the following statements about an ecosystem:
1. An ecosystem consists of all the interacting organisms of an area together with the non-living components of the environment.
2. Soil and minerals are biotic components of an ecosystem.
3. Parasites are counted among the consumers of an ecosystem.
Which of the statements given above is/are correct?
Match List-I with List-II:
| List-I (Example) | List-II (Category) |
|---|---|
| A. Green plants | 1. Non-biodegradable |
| B. Bacteria and fungi | 2. Producers |
| C. Vegetable peels and paper | 3. Biodegradable |
| D. Plastic and glass | 4. Decomposers |
Select the correct answer using the codes given below.
Consider the following statements about energy flow in an ecosystem:
1. At each trophic level, a large amount of energy is lost as heat.
2. Energy that has passed to the next trophic level can flow back to the previous level.
Which of the statements given above is/are correct?
Arrange the following stages of biological magnification in the correct sequence:
1. Chemicals accumulate in top consumers such as humans
2. Pesticides are used to protect crops
3. Chemicals are taken up by plants and aquatic organisms
4. Some of the chemicals pass into the soil and water
Select the correct sequence using the codes given below.
Consider the following statements:
1. A molecule of ozone is made up of three atoms of oxygen.
2. CFCs were used as refrigerants and in fire extinguishers.
3. The 1987 agreement to freeze CFC production was brought about by the World Health Organization.
Which of the statements given above is/are correct?
Match List-I with List-II:
| List-I (Figure) | List-II (Relates to) |
|---|---|
| A. About 1% | 1. Average share of food eaten that reaches the next trophic level |
| B. About 10% | 2. Year of the UNEP agreement to freeze CFC production |
| C. 1987 | 3. Share of sunlight converted to food energy by green plants in a terrestrial ecosystem |
| D. Three or four | 4. Usual number of steps in a food chain |
Select the correct answer using the codes given below.
Consider the following statements about biological magnification:
1. The harmful chemicals reach their highest concentration in producers.
2. The chemicals build up because they are not degraded.
3. Pesticide residues can be present in wheat, rice, vegetables and fruits.
Which of the statements given above is/are correct?
Consider the following statements about food chains and food webs:
1. Herbivores are primary consumers and come immediately after producers in a food chain.
2. A food web forms because an organism usually eats more than one kind of food.
Which of the statements given above is/are correct?
Consider the following statements about the components of an ecosystem:
1. Temperature and rainfall are abiotic components of an ecosystem.
2. Minerals present in the soil are biotic components of an ecosystem.
3. An ecosystem includes the non-living parts of an area along with its interacting organisms.
Which of the statements given above is/are correct?
Match List-I with List-II:
| List-I (Substance) | List-II (Associated with) |
|---|---|
| A. CFCs | 1. Food preservative |
| B. Pesticides | 2. Ozone depletion |
| C. Sodium benzoate | 3. Non-biodegradable waste |
| D. Plastic | 4. Biological magnification |
Select the correct answer using the codes given below.
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