Cell Processes And Constituents

Question 1

What is Osmosis?

Answer 1

It is the movement of water from an area of weaker solution to an area of stronger solution through a semi permeable membrane. It is a special form of diffusion.

Question 2

What are weak solutions called? Also what are strong solutions called?

Answer 2

Weak solutions are called hypotonic, while strong solutions are called hypertonic.

Question 3

What is a hypotonic process?

Answer 3

It is a situation where cell of a living plant or animal is surrounded by solution of lower concentration, hence leading to inflow of water into the cell.

Question 4

What is a hypertonic process?

Answer 4

It is a situation where cell of a living plant or animal is surrounded by solution of stronger solution, which leads to outflow of water from the cell, hence causing shrinking.

Question 5

What is an isotonic situation?

Answer 5

This is when the concentration of solution inside the cell and the concentration of solution surrounding the cell are the same.

Question 6

Give 3 conditions for Osmosis to occur

Answer 6

• Presence of a weaker solution
• Presence of a stronger solution
• Presence of a semi/selective permeable membrane.

Question 7

What is Diffusion?

Answer 7

Diffusion is the process where molecules or ions of a substance( I.e gas or liquid) moves from an area of stronger concentration to an area of weaker concentration until is evenly distributed.

Question 8

4 Factors that affect the rate of diffusion

Answer 8

• State of matter
• Temperature
• Molecular size
• Differences in concentration

Question 9

Give 5 importances of diffusion

Answer 9

• It helps in CO2 movement from lung capillaries into the air sac.
• It helps in gaseous exchange between many cells.
• It helps in intake of oxygen and nutrients from mother to foetus through the placenta.
• Water vapour leaving the leaves during transpiration is by diffusion.
• Movement of oxygen into the leaves of a plant through the stomata during respiration is by diffusion.

Question 10

3 Differences Between Diffusion and Osmosis

Answer 10

• While diffusion occurs in both liquid and gases, Osmosis occurs in liquid only.
• While diffusion requires no semipermeable membrane, osmosis does.
• While diffusion occurs in both living and non living cells, osmosis occurs in only living cells.

Question 10

3 Differences Between Diffusion and Osmosis

Answer 10

• While diffusion occurs in both liquid and gases, Osmosis occurs in liquid only.
• While diffusion requires no semipermeable membrane, osmosis does.
• While diffusion occurs in both living and non living cells, osmosis occurs in only living cells.

Question 11

3 Differences Between Diffusion and Osmosis

Answer 11

• While diffusion occurs in both liquid and gases, Osmosis occurs in liquid only.
• While diffusion requires no semipermeable membrane, osmosis does.
• While diffusion occurs in both living and non living cells, osmosis occurs in only living cells.