Page 20 - 02 Cells Biology Notes

Try this

Figure above shows root hair cells.

1. Explain how the presence of root hair cells on roots enables the
efficient absorption of water and minerals. [2 marks]
2. Root hair cells can absorb mineral ions by diffusion and active
transport.

a) Define the term active transport [2 marks]
b) Explain why respiration rates may increase in root hair cells during the
uptake of mineral ions [1 mark]

Answers

1. - Large number of root hair cells give a large surface area to the root.
- Mitochondria are present to provide energy for active transport.
2. a) active transport is absorption of a substance into a cell or across a
membrane
- against (up) a concentration gradient.
- using energy
b) active transport requires energy