O Level Biology: Transport in plants, questions with answers

A student investigates the movement of coloured water up a plant stem. The coloured water moves 12 mm up the stem in five minutes. What is the rate of movement of the water?

1. 12 mm / minute
2. 60 mm / minute
3. 60 mm / hour
4. 144 mm / hour

Which pathway is taken by water and mineral ions through a plant?

1. root hair cells → mesophyll cells → xylem → cortex cells
2. root hair cells → cortex cells → phloem → mesophyll cells
3. root hair cells → mesophyll cells → phloem → cortex cells
4. root hair cells → cortex cells → xylem → mesophyll cells

Which statement is always correct for both diffusion and osmosis?

1. They depend on energy from cells.
2. They involve the movement of particles down a concentration gradient.
3. They involve the movement of water molecules.
4. They take place only in liquids.

Four plant shoots were set up with petroleum jelly on leaf surfaces (upper, lower, both, or none) and a layer of oil to stop evaporation. Which row shows the results (percentage loss in mass after 24 hours) for plant 1 (lower), 2 (upper), 3 (both), 4 (none)?

1. 15 / 5 / 12 / 3
2. 5 / 12 / 3 / 15
3. 3 / 5 / 13 / 15
4. 3 / 15 / 5 / 12

Which statements about root hairs are correct? 1 The cell membrane can allow movement of water and ions into the cell. 2 The cell vacuole extends into the root hair. 3 They are formed as an extension of the outer layer of root cells.

1. 1, 2 and 3
2. 1 and 2 only
3. 1 and 3 only
4. 2 and 3 only

Which feature of a root hair cell helps it take up ions from water in the soil?

1. The cell has a partially permeable cell wall.
2. The cell is able to provide a source of energy.
3. The cell vacuole has a high ion concentration.
4. The cell vacuole has a low water potential.