Question

Micro-organisms act upon the dead plants to produce (i) sand (ii) mushrooms (iii) humus (iv) wood

• A. sand
• B. mushrooms
• C. humus
• D. wood

Answer 1

The correct option is C

humus

The correct option D.

Explanation of the correct option:

Option D:

1. To create humus, microorganisms decompose dead plants.
2. A variety of dead plants and animals are broken down by several microbes, including algae and amoeba, to produce a range of compounds, including humus.
3. Things can be broken down naturally so they don't affect the environment. They can later use the humus or other materials they produce for a variety of things.
4. Microorganisms work with the decomposing plants to create humus, a thick, dark substance.
5. The microorganisms, which include bacteria and fungi, are known as decomposers because they turn the dead plants and animals into humus.
6. Due to the abundance of valuable minerals and nutrients, it contains, humus is a crucial part of the soil.
7. Humus is divided into mor, mull, or moder forms based on the extent of its integration into the mineral soil, the sorts of organisms participating in its breakdown, and the plants from which it is formed.

Explanations of the incorrect options:

Option A:

1. Micro-organisms do not produce sand on decomposition.

Option B:

1. Mushrooms are classified as fungi, which are the ecosystem's main decomposers.
2. The decomposition and recycling of organic matter throughout the environment depend on decomposers. The reason is that they can convert decaying organic stuff into nutrients that can be absorbed.

Option C:

1. Wood decay plays a significant role in nature's carbon cycle.
2. Fungi, insects, and marine borers that use the wood for food, shelter, or both induce decomposition.
3. Lignin in wood acts as a physical barrier to prevent cellulose and hemicelluloses from being broken down by enzymes.

Final answer: Micro-organisms act upon the dead plants to produce humus.