3- movement in and out of cells

Question 1

diffusion

Answer 1

The net movement of particles from higher to lower

concentration area down a concentration gradient.

Question 2

source of energy for diffusion

Answer 2

kinetic energy of random movement of molecules and ions

Question 3

examples of diffusion in plants

Answer 3

-carbon dioxide gas from the air into the leaf during
photosynthesis.
- oxygen released from the leaf through the stomata.
- water vapor out of the leaf as transpiration.

Question 4

examples if diffusion in animals

Answer 4

• oxygen from lungs to blood.
• carbon dioxide from cells to blood.
• Products of digestion are absorbed from ileum of mammal

Question 5

factors affecting diffusion

Answer 5

temperature, concentration difference, diffusion distance, surface area

Question 6

osmosis

Answer 6

Diffusion of water molecules from high water potential
to low water potential area through partially permeable
membrane down concentration gradient

Question 7

example pf osmosis

Answer 7

movement of water in and out of cells

Question 8

isotonic conditions

Answer 8

water potentials are equal, no net movement

Question 9

hypotonic conditions

Answer 9

water potential outside cell is higher, so water enters the cell and it bursts or swells

Question 10

hypertonic conditions

Answer 10

water potentail inside cell is higher so water leaves the cell causing it to shrink and become flaccid

Question 11

active transport

Answer 11

Diffusion of water molecules from high water potential
to low water potential area through partially permeable
membrane.

Question 12

examples of active transport

Answer 12

1. root hair cells take in nutrients & minerals from soil.
2. glucose is actively transported from the lumen of the
   intestine into the villi cells.
3. glucose is actively transported from kidney tubules into the blood.