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CAIE IGCSE Biology 6.1.5 Subsequent Use and Storage Questions

Practise explaining how carbohydrates from photosynthesis are stored as starch, transported as sucrose, used for respiration and cell walls, and found in nectar that attracts pollinators.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • Trace glucose into starch for storage, sucrose for transport and cellulose for cell walls.
  • Explain starch’s role as an energy reserve.
  • Link glucose use to respiration.
  • Explain how sugars in nectar attract pollinators.

CAIE IGCSE Biology 6.1.5 Subsequent Use and Storage Questions question 1

[Maximum number: 3]

Scientists investigated the effect of cuticle thickness on water loss from the leaves of the balsam fir tree, Abies balsamea.

The leaves were divided into three groups:

A - thick cuticle

B - medium cuticle

C - thin cuticle Samples of leaves from each group were weighed. The leaves were placed on a tray in dry air at 20∘C20^{\circ} \mathrm{C}. The samples of leaves were reweighed, at intervals, over 15 hours. The scientists calculated the mass of each sample of leaves as a percentage of the initial mass. mass of the leaves as a percentage of the initial mass

Fig. 5.1 shows the results.

Fig. 5.1 shows the results.

Water is one of the raw materials needed for the production of sugars in photosynthesis.

State three ways a plant uses the sugars produced in photosynthesis.

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