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प्रश्न
List two important roles play in the environment by decomposers.
What is the role of decomposers in the ecosystem?
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उत्तर १
Role of decomposers:-
They recycle matter by breaking down the organic remains and waste products of plants and animals. These recycled matter are washed up and enter the soil from where plants absorb the nutrients again.
It also converts the waste matter back to unstable form.
उत्तर २
Various role played by decomposers in the ecosystem are:
- They clean the environment.
- They decompose biodegradable substances into useful substances.
- They release nutrients into soil by decomposing dead and decaying matter, thus making the soil fertile.
- They maintain the nutrient pool by returning back the nutrients in the pool.
उत्तर ३
Decomposers are microorganisms that act on dead and decaying bodies of producers and consumers and break them into simple inorganic compounds. They absorb some of the substances and release the rest into the environment to be recycled and to be used in future by producers. Thus, decomposers have a key role in the cycling of material in the biosphere and provide the raw materials to the producers. So in this way they make the soil fertile.
संबंधित प्रश्न
What is the difference between the food habits of organisms belonging to the first and the third trophic levels? Give one example each of the organisms belonging to these two trophic levels.
The sea water contains water beetles, tadpole, fish and weeds.
Which organisms in the food chain are herbivore, and carnivores?
Name the process in which a harmful chemical enters the food chain and gets concentrated at each trophic level.
If 5 joules of energy is available at producer level (plants), then how much energy will be transferred to the lion in the following food chain?
Plants → Goat → Lion
Fill in the following blank with suitable word :
Lettuce → ............. → Fox
What is ten per cent law? Explain with an example.
Which common pesticide has accumulated in human body in considerable amounts?
Explain why, the flow of energy in the ecosystem is said to be unidirectional.
Explain why, a food chain usually cannot have more than three or four steps.
What provides the energy which then flows through a food chain?
(a) glucose
(b) oxygen
(c) respiration
(d) sunlight
An aquatic food chain comprises of the organisms like tadpoles, weeds, fish and water beetles. The organism which gets the minimum energy through this food chain is :
(a) water beetles
(b) tadpoles
(c) weeds
(d) fish
| Human body is made up of five important components, of which water is the main component. Food, as well as potable water, are essential for every human being. The food is obtained from plants through agriculture. Pesticides are being used extensively for a high yield in the fields. These pesticides are absorbed by the plants from the soil along with water and minerals and from the water bodies these pesticides are taken up by the aquatic animals and plants. As these chemicals are not biodegradables, they get accumulated progressively at each trophic level. The maximum concentration of these chemicals gets accumulated in our bodies and greatly affects the health of our mind and body. |
- Why is the maximum concentration of pesticides found in human beings? (1)
- Give one method which could be applied to reduce our intake of pesticides through food to some extent. (1)
- Various steps in a food chain represent: (1)
- Food web
- Trophic level
- Ecosystem
- Biomagnification
- With regard to various food chains operating in an ecosystem, man is a: (1)
- Consumer
- Producer
- Producer and consumer
- Producer and decomposer
Arrange the following in a correct sequence and form a food chain
Human → Insect → Algae → Fish
If 100 J energy is available at the producer level in a food chain then the energy available to the secondary consumer will be ______.
Animals that eat both plants and animals are called as Carnivores.
Define – Heterotrophs.
Which group of organisms are not constituents of a food chain?
- Grass, lion, rabbit, wolf
- Plankton, man, fish, grasshopper
- Wolf, grass, snake, tiger
- Frog, snake, eagle, grass, grasshopper
Which statement is correct with respect to the food chain?
If a harmful chemical enters a food chain comprising peacocks, plants, rats and snakes, which of these organisms is likely to have the highest concentration of the chemical in its body? Justify your answer. Name the process involved and define it.
