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CAIE IGCSE Biology 6.1.2 Word Equation for Photosynthesis

Practise writing carbon dioxide + water → glucose + oxygen in the correct direction and identifying light and chlorophyll as necessary conditions rather than reactants.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • write carbon dioxide plus water forming glucose plus oxygen in the correct direction
  • state that light and chlorophyll are required without placing either as a reactant
  • identify oxygen as the other product when glucose or C₆H₁₂O₆ is already shown

6.1.2—Word equation for photosynthesis question 1

[Maximum number: 1]

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 the name of the other raw material needed for photosynthesis.

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