Question

On the basis of number of cells, living organisms are classified as unicellular and multicellular.
(i) Name two unicellular organisms.
(ii) What is meant by division of labour in multicellular organisms?
(iii) Name one prokaryotic and one eukaryotic unicellular organism.
(iv) 'Every multicellular organism has come from a single cell. Justify this statement.
(v) Write one common feature between an Amoeba and white blood cells of humans.​

Answer 1

Explanation:

1. bacteria, fungi
2. All the cells perform specific functions. All the cells specialised for performing similar functions are grouped together as tissues in the body.Similarly, different functions are carried out by different groups of cells in an organism and this is known as the division of labour in multicellular organisms.
3. Yeasts and algae are examples of unicellular eukaryotes.Bacteria and archaea are examples of unicellular prokaryotes.
4. Yes it is true that every multicellular organism arises from a single cell. Cells divide to produce cells of their own kind. For example, after an ovum has been fertilized, the resulting one-celled organism becomes known as a zygote.
5. The only common feature between amoeba and the white blood cells in humans is that both are unicellular. Explanation: This implies that both consist of only one cell. Other than that amoeba is a whole organism in itself while white blood cells are part of the human body.

Answer 2

Explanation:

1. bacteria, fungi

2. All the cells perform specific functions. All the cells specialised for performing similar functions are grouped together as tissues in the body.Similarly, different functions are carried out by different groups of cells in an organism and this is known as the division of labour in multicellular organisms.

3. Yeasts and algae are examples of unicellular eukaryotes. Bacteria and archaea are examples of unicellular prokaryotes.

4. Yes it is true that every multicellular organism arises from a single cell. Cells divide to produce cells of their own kind. For example, after an ovum has been fertilized, the resulting one-celled organism becomes known as a zygote.

5. The only common feature between amoeba and the white blood cells in humans is that both are unicellular. Explanation: This implies that both consist of only one cell. Other than that amoeba is a whole organism in itself while white blood cells are part of the human body.