Question

Class IX
Biology
Worksheet-2
The fundamental unit of life
Q.1. Who presented the ;'cell theory and what are the main postulates of
Q.2. What happens if we keep an animal cell in a
a. Hypotonic solution
b. Hypertonic solution
C. Isotonic solution
Q.3. Differentiate between
a. Diffusion and osmosis
b. Prokaryotic cell and Eukaryotic cell
Q.4. Explain how the structure of the following cells is related to their functions
a neuron​

Answer 1

Q1.Schleiden and Schwann

Postulates:

1.all living organisms are composed of cells and

products of cells.

2.all cells arise from pre-existing cells.

Q2.a)cell becomes turgid or cell swells

b)cell shrinks

c)no change occurs

Q3.a)Diffusion:

The net movement of molecules from a region of their higher concentration to a region of their lower concentration along a concentration gradient until an equilibrium is attained.

a)Osmosis:

It is a special type of diffusion.It represents the movement of solvent molecules or water through a selectively permeable membrane from the place of it's higher concentration to the place of it's lower concentration.

b)see in attachment

Q4.Neuron:see in attachment

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