Question

Multicellular organisms have division of labour. Explain.

Answer 1

Hint: In the human respiratory system helps in breathing, digestive system helps in digesting food, circulatory system helps in the circulation of blood, etc.

Complete Answer:
- All living beings are made up of cells. In unicellular organisms, all essential tasks are done by a single cell. For example, in amoeba a single cell carries out breathing, ingestion of food and respiratory gases, respiration and excretion.
- While, there are millions of cells in multicellular organisms. Most of these cells are specially built to execute a few activities.Cells specialized in one role are frequently clustered together in the body.
- This implies that a certain function is done by a cluster of cells at a specific location in the body. This cluster of cells, called tissues, is organized and designed to have the highest possible quality of work. Blood, phloem, and muscle are also forms of tissue. The tissue is created by a group of cells that are identical in shape and operate together to perform a specific task.
- There are millions of cells of multicellular organisms. Most of these cells are specially built to execute a few tasks. Each special function is done by a separate group of cells. Although these cells perform only a single role, they do this quite effectively.
- In humans, muscle cells contract and relax to induce movement, nerve cells carry signals, blood flows to deliver oxygen, food, hormones and waste materials, and so on. In plants, the vascular tissues bring food and water from one part of the plant to the other. Thus, multicellular species demonstrate a division of labour.

Note: The use of tissue in multicellular organisms is intended to provide structural and mechanical strength. They have an intrinsic beneficial condition for the proper processing of cells. Thus, the division of labour comes from a multicellular body.