Movement into & out of cells

Question 1

What is the role of water

Answer 1

• used as a reagent in digestion, hydrolysis
• dissolve metabolic wastes & excrete them out of the body
• transport medium in blood & vascular tissues of plants

Question 2

What is diffusion

Answer 2

Net movement of molecules from a region of higher concentration to a region of lower concentration down a concentration gradient

Question 3

Factors affecting diffusion

Answer 3

1) SA
2) Temperature
3) Concentration gradient
4) Distance

Question 4

What is osmosis

Answer 4

Net movement of water molecules from a region of higher water potential to a region of lower water potential through a partially permeable membrane

Question 5

Importance of turgidity

Answer 5

• keep stems upright
• keep leaves firm & flat so they can absorb
  sunlight

Question 6

What is active transport

Answer 6

Movement of molecules from a region of lower concentration to a region of higher concentration against a concentration gradient, by using metabolic energy