1. Briefly explain the various levels of organization of a pond ecosystem.
2. How are the biotic elements of an ecosystem linked to one another?
3. Without the complex interaction between the biotic elements and
atmosphere, life would not have been existed on the earth-Justify the
statement.
4. Any increase or decrease in the population of any one species in an
ecosystem has an effect on the population of other species-Explain with
example,
5. In what way do you think an oil spill in a water body will have an effect on
the biotic elements living in that ecosystem?
6. Sun is the source of energy for all living beings. Justify.
7. Why is the existence of decomposers essential in nature?
8. Arrange the following elements in order of their level of organisation:
Ecosystem, biosphere, community, population
9. With the help of a graphic organiser, depict the different types of biotic
elements; give one characteristic feature and example of each element.
10. Which one of the following is not a part of the biotic community and why?
Water, algae, fish, bacteria
11. How, according to you, do water and soil play an important part in an
ecosystem?
12. With the help of an example, describe how plants interact with the
physical environment around them.
Answers
2..Biotic components include plants, animals, decomposers. Nonliving components include air, water, land. A food chain is a chain in an ecosystem where there is transfer of food and energy from one organism to another in a sequence. Thus, the correct answer is 'Food chain.
5.Spilled oil can harm living things because its chemical constituents are poisonous. ... Oil can also smother some small species of fish or invertebrates and coat feathers and fur, reducing birds' and mammals' ability to maintain their body temperatures.
6.Sun is the ultimate energy source for all living organisms." ✴This is because plants need sunlight to make food through photosynthesis. This food is consumed by the animals and human-beings. Carnivores indirectly depend on plants for their food.
7. The existence of decomposers is essential in a biosphere because they breakdown complex organic substances into simple inorganic substance than can be absorbed by the plants.
10.All of these are a part of some ecosystem. Water is an abiotic component while algae, bacteria and fish constitute biotic components.
Explanation:
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