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Identify Substances Needed for Photosynthesis

In this worksheet, students will consider in more depth the process of food production, for example the conditions and materials needed in photosynthesis, as well as the scientific equation.

'Identify Substances Needed for Photosynthesis' worksheet

Key stage:  KS 3

Year:  Year 7 Science worksheets

Curriculum topic:   Biology: Material Cycles and Energy

Curriculum subtopic:   Photosynthesis

Popular topics:   Biology old worksheets

Difficulty level:  

Worksheet Overview



Plants produce their own food by a process called photosynthesis


The green colour we see in leaves is due to a pigment called chlorophyll. The chlorophyll is found inside the chloroplast which is an organelle in the plant cell (see if you can spot the chloroplast in the image below). 


Image of a plant cell


Chlorophyll combines water and a gas (carbon dioxide) using light to make sugar (glucose) and oxygen. We can represent this as a word equation: 


water + carbon dioxide + (light) → glucose + oxygen


Image of a plant


The cells in the leaves are responsible for sugar production. This is why the leaves are normally broad, so they can capture enough sunlight to power photosynthesis. The sugar made in the leaves can be transported around the plant through the stem where it can be used for different processes like respiration. Water and minerals are also transported through the stem from the roots to the leaves.


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