Science
Which of the following is not a role of decomposers in the ecosystem?
options
- Natural replenishment of soil.
- Enrichment of oxygen in atmosphere.
- Waste decomposition.
- Break-down of dead remains.
Answer
Enrichment of oxygen in atmosphere.
Reason — Decomposers such as bacteria and fungi play a vital role in maintaining the balance of the ecosystem as they break down dead plants and animals into simpler substances, a process called decomposition.
This helps in the recycling of nutrients, leading to the natural replenishment of soil with minerals and organic matter and decomposers also help in waste decomposition, keeping the environment clean.
However, they do not enrich the atmosphere with oxygen. In fact, during decomposition, decomposers use up oxygen for respiration and release carbon dioxide instead.
Hence, enrichment of oxygen in the atmosphere is not a role of decomposers.
Related Questions
Choose the correct option for the colour of rays for A and B.
Colour of Ray A Colour of Ray B A. Blue Red B. Green Yellow C. Red Violet D. Violet Indigo options
- A
- B
- C
- D
Identify the incorrect statement
‘The energy available to the producers is maximum’ because:
options
- It is the first trophic level which absorbs 1% of light energy directly from the source.
- It utilizes the most of the chemical energy for its own respiration, growth, reproduction, movement etc.
- It utilizes 10% of light energy and transfers the rest to the next trophic level.
- It transfers only 10% of light energy to the next trophic level
Assertion (A) : On adding dil. HCl to a test tube containing a substance ‘X’, a colourless gas is produced which gives a pop sound when a burning match stick is brought near it.
Reason (R) : In this reaction metal ‘X’ is displaced by Hydrogen.
options
- Both A and R are true, and R is the correct explanation of A.
- Both A and R are true, and R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Assertion (A) : Generally, the number of chromosomes in a cell and in a germ cell is not the same in species.
Reason (R) : When two germ cells combine, they restore the normal number of chromosomes in a species.
options
- Both A and R are true, and R is the correct explanation of A.
- Both A and R are true, and R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.