ent var
During photosynthesis, green plants use energy from the sun
to convert simple chemicals to glucose.
ant gro
able
A word equation for this process is given below:
water + gas A + glucose + gas B
Name gas B and explain how this gas is used by a plant and
why it is needed.
eedback

Green plants capture energy and convert it into chemical energy by the process known as photosynthesis. During photosynthesis, carbon dioxide and water are transformed into simple carbohydrates and oxygen is liberated into the atmosphere.

light

6CO2 + 12H2O ----------------> C6H12O6 + 6O2

chlorophyll

Water is also used as a source of hydrogen required for reduction of carbon dioxide to form carbohydrate.

Water is oxidised in presence of light and chlorophyll. Hydrogen is removed from water and oxygen is released as follows:

light

4‎H20 ---------------> 2‎H20 + 4H+ + 4e− + O2

chlorophyll

or,

2‎H2O ----------------> 4H+ + 4e− + O2

Hence the source for oxygen gas is water and it is released when water splits in the presence of sunlight into oxygen and hydrogen ions.

So, the correct answer is 'Water, released when sunlight splits it into oxygen and hydrogen ions'.

ent var During photosynthesis, green plants use energy from the sun to convert simple chemicals to glucose. ant gro able A word equation for this process is given below: water + gas A + glucose + gas B Name gas B and explain how this gas is used by a plant and why it is needed. eedback

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ent var
During photosynthesis, green plants use energy from the sun
to convert simple chemicals to glucose.
ant gro
able
A word equation for this process is given below:
water + gas A + glucose + gas B
Name gas B and explain how this gas is used by a plant and
why it is needed.
eedback