Question: Explain the role of decomposers. Give two examples for decomposers. [3 MARKS]Options:
: Role: 1 Mark
Each Example: 1 Mark
The micro-organisms which convert dead plants and animals to humus are known as decomposers.They play an important role in the decomposition of dead remains of the plants and animals and converting them to humus which adds nutrients to the soil.
Bacteria and fungi are the two examples of decomposers.
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More Questions on This Topic :
: Each correct match: 1 Mark
The correct match would be(a) (iii); (b) (v); (c) (iv); (d) (i); (e) (ii)
a) Decomposers are usually microorganisms that feed on dead and decaying matter.
b) Canopy is usually made of branches of tall trees.
c) Porcupine is a wild animal.
d) Humus consists of dead plants and animal tissues.
e) Forest serves as a habitat for wildlife.
: Each factor : 1 Mark
Factors which areresponsible for the destruction of forests are:
(i) Construction of roads
(ii) Construction of buildings andIndustrial development
(iii) Increasing demand of wood
Question 3. Observe the following food chain. Is it correct? If not, write the correct food chain. Explain. [3 MARKS]
: Identification: 1 Mark
Correct food chain and explanation: 2 Marks
The food chain is incorrect.
The correct food chain will be:Grains→Rats→Snakes→Eagle.
Rats feed on grains, while ratsare consumed by snakeswhich in turn are eatenby eagles.
Question 4. Animals dwelling in the forests play an important role in its growth and regeneration. Justify. [2 MARKS]
: Each point: 0.5 Mark
Animals dwelling in the forests are instrumental in the forest's growth and regeneration. For example:
(i) Herbivorous animals clear the land by eating grass for the new growth of vegetation.
(ii) Animals help in seed dispersal and pollination.
(iii) Dead and decaying bodies of animals get converted to humus after decomposition, which increases the fertility of the soil of the forest.
(iv) Dung of animals provide nutrients to various types of seedlings to grow.
Question 5. Is there really a need for so much diversity in plants and animals in the forest? Justify. [2 MARKS]
: Stating yes or no: 1 Mark
Reasoning out: 1 Mark
Yes, there is a need for diversity of animals and plants in a forest.
This is so because each of them contributes uniquely towards the maintenance of the ecosystem of the forest. Plans and animals help forests in their regeneration and growth. For example, Herbivores are needed to eat green plants and they become food for the carnivores. Carnivores are needed to eat herbivores and in turn, check their population. Decomposers are needed to maintain the supply of nutrients to the soil for the growth of plants.
: Each point: 1 Mark
1) Forests are the dominant terrestrial ecosystem of Earth, and are distributed across the globe 2) Forests account for 75% of thegross primary productivityof the Earth'sbiosphere, and contain 80% of the Earth's plant biomass.
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