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O Level Biology: Transport in Flowering Plants MCQs — Biology

19 multiple-choice questions on O Level Biology: Transport in Flowering Plants from Biology, each with the correct answer and, where available, a teacher's explanation. Read through them to revise the chapter, then practise the same questions one by one to test yourself.

1. A potometer actually measures the rate of

  1. translocation
  2. water uptake
  3. water loss only
  4. photosynthesis

Answer: B) water uptake

Explanation: It measures uptake, which is roughly equal to transpiration. O Level Biology · Topic 7 Transport in Flowering Plants · 7.2 Transpiration and translocation

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2. Mineral ions are usually absorbed by root hair cells by

  1. translocation
  2. transpiration
  3. osmosis
  4. active transport

Answer: D) active transport

Explanation: Ions are taken up against a gradient using energy. O Level Biology · Topic 7 Transport in Flowering Plants · 7.1 Uptake and transport of water and ions

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3. Translocation is the movement of

  1. sucrose and amino acids in the phloem
  2. water in the xylem
  3. ions into roots
  4. water vapour from leaves

Answer: A) sucrose and amino acids in the phloem

Explanation: Translocation happens in phloem. O Level Biology · Topic 7 Transport in Flowering Plants · 7.2 Transpiration and translocation

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4. A celery stalk is placed in coloured dye. Which tissue becomes stained?

  1. Epidermis
  2. Phloem
  3. Cortex only
  4. Xylem

Answer: D) Xylem

Explanation: Dye travels with water in the xylem. O Level Biology · Topic 7 Transport in Flowering Plants · 7.1 Uptake and transport of water and ions

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5. Transpiration is

  1. the making of glucose
  2. the uptake of water by roots
  3. the movement of sugar in phloem
  4. the loss of water vapour from leaves

Answer: D) the loss of water vapour from leaves

Explanation: Definition of transpiration. O Level Biology · Topic 7 Transport in Flowering Plants · 7.2 Transpiration and translocation

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6. Water enters root hair cells by

  1. transpiration
  2. active transport
  3. osmosis
  4. translocation

Answer: C) osmosis

Explanation: Water moves into the lower water potential by osmosis. O Level Biology · Topic 7 Transport in Flowering Plants · 7.1 Uptake and transport of water and ions

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7. Water moves up the xylem mainly by

  1. active transport
  2. transpiration pull and cohesion of water molecules
  3. osmosis in xylem vessels
  4. translocation

Answer: B) transpiration pull and cohesion of water molecules

Explanation: Evaporation pulls a continuous column of water upwards. O Level Biology · Topic 7 Transport in Flowering Plants · 7.2 Transpiration and translocation

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8. Which condition DECREASES the rate of transpiration?

  1. High wind speed
  2. High humidity
  3. High light intensity
  4. High temperature

Answer: B) High humidity

Explanation: Humid air reduces the water vapour gradient. O Level Biology · Topic 7 Transport in Flowering Plants · 7.2 Transpiration and translocation

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9. Root hair cells are adapted for absorbing water because they have

  1. thick walls
  2. many chloroplasts
  3. a waxy cuticle
  4. a large surface area

Answer: D) a large surface area

Explanation: The long hair gives a large surface area. O Level Biology · Topic 7 Transport in Flowering Plants · 7.1 Uptake and transport of water and ions

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10. Root hair cells do NOT contain

  1. a nucleus
  2. mitochondria
  3. chloroplasts
  4. a cell membrane

Answer: C) chloroplasts

Explanation: Roots are underground, so no chloroplasts. O Level Biology · Topic 7 Transport in Flowering Plants · 7.1 Uptake and transport of water and ions

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11. Which is the correct pathway of water through a plant?

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

Answer: A) root hair → cortex → xylem → mesophyll

Explanation: Water passes from root hair cells through the cortex to the xylem, then to the leaf. O Level Biology · Topic 7 Transport in Flowering Plants · 7.1 Uptake and transport of water and ions

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12. Which feature of xylem vessels prevents them collapsing?

  1. Walls thickened with lignin
  2. Living cytoplasm
  3. Cross walls
  4. Chloroplasts

Answer: A) Walls thickened with lignin

Explanation: Lignin strengthens the walls. O Level Biology · Topic 7 Transport in Flowering Plants · 7.2 Transpiration and translocation

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13. Which is a sink for sucrose?

  1. A developing fruit
  2. The xylem
  3. A mature leaf in sunlight
  4. The stomata

Answer: A) A developing fruit

Explanation: Sinks use or store sugar. O Level Biology · Topic 7 Transport in Flowering Plants · 7.2 Transpiration and translocation

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14. Xylem vessels have no cross walls so that

  1. sugar can move
  2. they can divide
  3. they can photosynthesise
  4. water can flow in a continuous column

Answer: D) water can flow in a continuous column

Explanation: Open tubes allow continuous flow. O Level Biology · Topic 7 Transport in Flowering Plants · 7.2 Transpiration and translocation

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15. In a dicot stem, the vascular bundles are arranged

  1. in the centre only
  2. in the epidermis
  3. scattered randomly
  4. in a ring near the outside

Answer: D) in a ring near the outside

Explanation: Stem vascular bundles form a ring. O Level Biology · Topic 7 Transport in Flowering Plants · 7.2 Transpiration and translocation

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16. Wind increases transpiration because it

  1. increases humidity
  2. cools the leaf
  3. removes water vapour from around the leaf
  4. closes the stomata

Answer: C) removes water vapour from around the leaf

Explanation: Moving air keeps the concentration gradient steep. O Level Biology · Topic 7 Transport in Flowering Plants · 7.2 Transpiration and translocation

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17. Why does a plant wilt on a hot, dry day?

  1. It makes too much starch
  2. It loses water faster than it takes it up
  3. Its stomata are always closed
  4. Phloem stops working

Answer: B) It loses water faster than it takes it up

Explanation: Water loss exceeds uptake, so cells become flaccid. O Level Biology · Topic 7 Transport in Flowering Plants · 7.2 Transpiration and translocation

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18. In a transverse section of a dicot root, the xylem is

  1. in the epidermis
  2. absent
  3. in the centre
  4. in a ring near the outside

Answer: C) in the centre

Explanation: Root xylem is central. O Level Biology · Topic 7 Transport in Flowering Plants · 7.2 Transpiration and translocation

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19. Water vapour leaves the leaf through the

  1. stomata
  2. cuticle
  3. xylem
  4. phloem

Answer: A) stomata

Explanation: Water vapour diffuses out through stomata. O Level Biology · Topic 7 Transport in Flowering Plants · 7.2 Transpiration and translocation

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