a) Differentiate
(a) (i)
Nucleus | Nucleoid |
A nucleus is a membrane-bound structure in which eukaryotes assemble their genetic materials. | Nucleoid is a particular area in which prokaryotes assemble their genetic materials. |
A nucleus is well organised and is large. | Nucleoid is poorly organised and is small. |
A nucleus is engirdled by a double layer membrane known as nuclear membrane which separates the nucleus from other organelles. | Nucleoid lacks a protective membrane. |
A nucleus comprises several chromosomes. | Nucleoid usually contains only one chromosome. |
(ii)
Plant Cell | Animal Cell |
Cell shape is Square or rectangular in shape | Cell shape is Irregular or round in shape |
Cell wall is present | Cell wall is absent |
Nucleus is present and lies on one side of the cell | Nucleus is present and lies in center of the cell |
This has few large or a single, centrally positioned vacuole | Vacuole are usually small and numerous |
(b) Osmosis is the movement of water molecules from a region of higher water concentration to a region of lower water concentration across a semipermeable membrane
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