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CAIE IGCSE Biology 6.1.5 Subsequent use & storage

Practise explaining how products of photosynthesis are used for respiration, transport, storage and building plant tissues.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • state that glucose can be converted to starch for storage, sucrose for transport and cellulose for cell walls
  • explain why starch is stored as an energy reserve for times when a plant cannot photosynthesise
  • link glucose to respiration and sugars in nectar to attracting pollinators

6.1.5—Subsequent use and storage 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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