(a) Name and draw a cell which does not have a well defined nuclear region. Label any four parts.
(b) Mention two ways by which a photosynthesising cell belonging to this group differs from a cell of your body.

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Solution

(a) Cells that do not possess a well defined nucleus are called prokaryotc cells. A typical prokaryotic cell can be represented as follows:

(b) The difference between a photosynthetic prokaryotic cell and a human cell are as follows:

Photosynthetic prokaryotic cell Human

1. Photosynthetic pigments are enclosed in membranous structures. 1. Photosynthetic pigments are not present.

2. Cell is present across the cell membrane. 2. Cell wall is absent.

3. Nucleoid is present instead of nucleus. 3. A well defined nucleus is present.

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The diagram below represents a stage during cell division. Study the same and then answer the questions that follow :
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Photosynthetic prokaryotic cell	Human
1. Photosynthetic pigments are enclosed in membranous structures.	1. Photosynthetic pigments are not present.
2. Cell is present across the cell membrane.	2. Cell wall is absent.
3. Nucleoid is present instead of nucleus.	3. A well defined nucleus is present.

(a) Name and draw a cell which does not have a well defined nuclear region. Label any four parts. (b) Mention two ways by which a photosynthesising cell belonging to this group differs from a cell of your body.

(a) Name and draw a cell which does not have a well defined nuclear region. Label any four parts.
(b) Mention two ways by which a photosynthesising cell belonging to this group differs from a cell of your body.