Plants, unlike animals, can make their own food. They do this using a process called photosynthesis.
The word and symbol equations for photosynthesis are:
Be careful not to confuse this photosynthesis equation with respiration which is the reverse of this.
Photosynthesis requires energy in the form of light to drive the chemical reaction. Photosynthesis is an endothermic reaction.
Photosynthesis is a process with two main stages:
Plant leaves are the main photosynthetic organ, but many other parts of the plant exposed to light will develop chlorophyll and photosynthesise.
Oxygen is formed as the waste product. Some is used for the plant's respiration, and the rest is released which makes it available for respiration to animals and many microorganisms. During the day, provided the rate of photosynthesis is sufficiently high, plant leaves, and water plants, give out oxygen.
Some of the glucose produced by photosynthesis is used for respiration.
Glucose is the starting point for the biosynthesis of materials that plants need to live.
The glucose not used for respiration is used in the following ways: