CBSE Class 9 Answered
(a)Differentiate between:
(i)Nucleus and nucleoid
(ii)Plant cell and animal cell
(b)What is osmosis?
Asked by Topperlearning User | 18 Mar, 2016, 09:51: AM
Expert Answer
(a)
(i) Nucleus has nuclear membrane, chromatin network and more than one chromosome whereas nucleoid has no nuclear membrane and only one circular chromosome is present.
(ii)
|
Plant cell |
Animal cell |
|
|
1 |
Plant cells have an outer, rigid cell wall. |
Animal cells lack cell wall. |
|
2 |
Plastids are present in plant cell. |
Plastids are absent in animal cell. |
|
3 |
Large, central and permanent vacuole is present. |
Animal cells have small and many vacuoles which may be temporary. |
|
4 |
Plant cell is generally larger than animal cell. |
Animal cell is smaller in size. |
(b)Osmosis is the movement of water molecules from a region of higher water concentration to region of lower water concentration across a semi permeable membrane.
Answered by | 18 Mar, 2016, 11:51: AM
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