Question

Dead and decayed residue of plants and animals is called.

• A. Clay
• B. Silt
• C. Humus
• D. Sand

Answer 1

The correct option is C

Humus

The correct answer is C.

Explanation of Correct option:

1. Organic matter present in the soil is called humus.
2. Humus is formed when there is an action of micro-organisms on dead plants and animals.

Explanation of Incorrect option:

Option A:

1. Clay is a fine-grained natural soil, that has very smaller and tightly packed particles.
2. It is formed by chemical weathering.

Option B:

1. Silt is made up of rock and mineral particles that are larger than clay.
2. It is formed when there is a physically weathered of larger rocks takes place.

Option D:

1. Sand particles are large and have very less micro-organisms.
2. It is formed when rocks break down from weathering

Final answer:

Dead and decayed residue of plants and animals is called humus.