JAMB 2022 Biology · Question 22

The movement of sugars from the leaf to other parts of plant is?

Options

  1. A.guttation
  2. B.transpiration
  3. C.transportation
  4. D.translocation

Answer: D. translocation

Explanation written with AI and checked against the answer key

Step 1: Analyze the question The question asks for the term used for the movement of sugars (made in the leaves by photosynthesis) to other parts of the plant, such as roots, fruits, and growing tips.

Step 2: Explain the concept Plants make sugars (mainly sucrose) in the leaves during photosynthesis. These sugars must reach parts that cannot make their own food. This movement of organic food substances happens through the phloem and is called translocation.

Step 3: Check each option

  • A. Guttation: The loss of liquid water (not sugar) as droplets from the leaf edges, usually at night or early morning, through hydathodes. ❌
  • B. Transpiration: The loss of water vapour from the leaves through the stomata. ❌
  • C. Transportation: A general word for moving things. It is not the specific biological term for the movement of sugars in plants. ❌
  • D. Translocation: The movement of manufactured food (sucrose and amino acids) through the phloem from the source (leaves) to the sinks (roots, fruits, stems, storage organs). ✅

Step 4: Answer The correct option is D. translocation.

💡 Exam tip: Remember the pairs:

  • Xylem → water and minerals → upward (transpiration pull)
  • Phloem → sugars and food → up and down (translocation)

Link the "t" in translocation with "transfer of food". Also note that transpiration has to do with water loss, and guttation with liquid water droplets.

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