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(a)Differentiate between:

   (i)Nucleus and nucleoid

   (ii)Plant cell and animal cell

(b)What is osmosis?

Asked by Topperlearning User 18th March 2016, 9:51 AM
Answered by 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 Expert 18th March 2016, 11:51 AM
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