Question

The successive decomposition of dead material and modified organic matter results in the formation of a more complex organic matter, which is called:
1. Humus
2. Moth
3. Algae
4. Marsh

Answer 1

Correct Answer - Option 1 : Humus

The correct answer is Humus.

The successive decomposition of dead material and modified organic matter results in the formation of a more complex organic matter, which is called humus. 

• Humus derived from microbial decomposition of plant and animal substances.
• Humus ranges in colour from brown to black.
• It consists of about 60 percent carbon, 6 percent nitrogen, and smaller amounts of phosphorus and sulfur.
• As humus decomposes, its components are changed into forms usable by plants. 

• Moth, any of about 160,000 species of overwhelmingly nocturnal flying insects that, along with the butterflies and skippers, constitute the order Lepidoptera.
• Algae is a member of a group of predominantly aquatic photosynthetic organisms of the kingdom Protista. Algae have many types of life cycles, and they range in size from microscopic Micromonas species to giant kelps that reach 60 meters in length.
• A marsh is a wetland that is dominated by herbaceous rather than woody plant species. Marshes can often be found at the edges of lakes and streams, where they form a transition between the aquatic and terrestrial ecosystems.