Active transport

Question 1

Active transport

Answer 1

The movement of molecules and ions in and out of the cell membrane using energy from respiration against the concentration gradient.

Question 2

Uses of active transport

Answer 2

1. Absorption of minerals and ions from soil in plants.
2. Absorption of amino acids, salts and glucose in villi in plants.
3. Reabsorption of wanted substance in kidney transported in bloodstream.

Question 3

Factors affecting active transport: Mitochondria

Answer 3

The larger the number of mitochondria, the more energy produced, increasing the rate of active transport.

Question 4

Factors affecting active transport: Oxygen concentration

Answer 4

The higher the oxygen concentration, the faster the respiration, increasing the energy produced, increasing the rate of active transport.

Question 5

Factors affecting active transport: Surface area to volume ratio

Answer 5

The greater the SA to volume ratio, the greater the number of carriers in the membrane, the faster the rate of active transport.

Question 6

Factors affecting active transport: Temperature

Answer 6

The higher the temperature, the faster the respiratory enzymes move, increasing collisions, increasing rate of active transport.