Practicing Success

Target Exam

CUET

Subject

Biology

Chapter

Ecosystem

Question:

Read the given passage and answer the questions that follow:-

The earthworm is often referred to as the farmer's 'friend' due to its beneficial role in the breakdown of complex organic matter and soil aeration. Similarly, decomposers play a crucial role in converting complex organic matter into inorganic substances like carbon dioxide, water, and nutrients through the process of decomposition. Detritus, consisting of dead plant remains (leaves, bark, flowers) and animal waste, serves as the raw material for decomposition. Decomposition involves several important steps: fragmentation, leaching, catabolism, humification, and mineralization.

Read the given statements and choose the correct option.
Statement 1:- The humus is further degraded by some microbes and release of inorganic nutrients occur by the process known as mineralisation.
Statement 2:-Dead plant remains such as leaves, bark, flowers and dead remains of animals, including fecal matter, constitute detritus.

Options:

Both the statements are correct.

Only statement 1 is correct.

Both the statements are incorrect.

Only statement 2 is correct.

Correct Answer:

Both the statements are correct.

Explanation:

The correct answer is Option (1) -Both the statements are correct.

Dead plant remains such as leaves, bark, flowers and dead remains of animals, including fecal matter, constitute detritus. Humification leads to accumulation of a dark coloured amorphous substance called humus that is highly resistant to microbial action and undergoes decomposition at an extremely slow rate. Being colloidal in nature it serves as a reservoir of nutrients. The humus is further degraded by some microbes and release of inorganic nutrients occur by the process known as mineralisation.