Diffusion is the spreading out of particles from an area of low concentration to an area of high concentration.
B.
Diffusion is the movement of water molecules through a semi permanent membrane.
C.
Diffusion is the movement of substrate molecules against a concentration gradient.
D.
Diffusion is the spreading out of particles from an area of high concentration to an area of lower concentration.
2.
2. Which one of the following substances cannot diffusion through cell membranes.
A.
Starch
B.
Glucose
C.
Oxygen
D.
Amino acids
3.
3. The rate of diffusion can be increased by?
A.
Decreasing the size of the concentration gradient.
B.
Increasing the size of the substrate molecules.
C.
Increasing the size of the concentration gradient.
D.
Adding a semi permeable membrane.
4.
4. How are epithelial cells in the small intestine specialised to increase the rate of diffusion?
A.
They are especially permeable which allows diffusion to happen easily.
B.
The are very large cells which allows diffusion to happen easily.
C.
They are slightly warmer than other cells which increases the rate of diffusion as particles move more quickly.
D.
They have a folded cell membrane which increases the surface area.
5.
5. What is osmosis?
A.
Osmosis is the movement of water molecules across a partially permeable membrane from a region of high water concentration to a region of lower water concentration.
B.
Osmosis is the Diffusion is the spreading out of particles from an area of high concentration to an area of lower concentration.
C.
Osmosis is the movement of water molecules across a partially permeable membrane from a region of lower water concentration to a region of higher water concentration.
D.
Osmosis is the spreading out of particles from an area of low concentration to an area of higher concentration.
6.
6. What is active transport?
A.
Active transport is the movement of particles down a concentration gradient using energy from respiration.
B.
Active transport is when ions from saturated solution actively move through a semi permeable membrane.
C.
Active transport is the movement of particles against a concentration gradient using energy from respiration.
D.
Active transport is how the roots of plants take in water from water logged soil.
7.
7. A mouse is represented by a cube measuring 1cm x 1cm x 1cm. What is the surface area to volume ratio?
A.
Surface area of 1cm2 and a volume of 3cm3
B.
Surface area of 6cm2 and a volume of 1cm3
C.
Surface area of 2cm2 and a volume of 3cm3
D.
Surface area of 1cm2 and a volume of 1cm3
8.
8. How are capillaries adapted to for diffusion?
A.
They have a folded membrane to allow increased rates of diffusion.
B.
They are connected to lower pressure veins which means the blood moves slower to allow maximum diffusion.
C.
They are connected to high pressure arteries which force blood through them quickly to allow maximum diffusion.
D.
They have cell walls which are one cell thick to allow easy diffusion.
9.
9. How are alveoli in the lungs adapted for diffusion?
A.
They have an small surface area, moist thin walls and a good bloody supply.
B.
They have moist, thin walls with a good blood supply and an enormous surface area.
C.
They have moist and thick walls with a good blood supply and an enormous surface area.
D.
They have dry, thin walls with a good blood supply and an enormous surface area.
10.
10. Fish gills are made of thin plates called gill filaments. These contain tiny structures which increase surface area. These structures are called?
