6.1 Making
carbohydrates
using light energy
By: 9a Avidirmaa
Table of contents
01
02
Plant
nutrition
How a plant
uses
carbohydrates
Plant nutrition
Plants can make their own food by
photosynthesis. This process happens in
the chlorophyll.
Sunlight
and
chlorophyll
Carbon dioxide + water
glucose + oxygen
6CO2 + 6H2 O → C6 H12 O6 + 6O2
How a plant uses carbohydrates
Plants use glucose that they have produced for many purposes.
• Releasing useful energy
• Storing, to use later
• Making sucrose, for transport
• Making cellulose, to build
new cell walls
• Making nectar, to attract
pollinators
• Making amino acids, to make
proteins
• Making other substances, e.g
chlorophyll
Storing, to use later
•
•
•
•
They store the glucose in form
of starch.
they are insoluble in water.
They don’t disturb chemical
reaction in a plant.
They don’t affect the
concentration of solutions
inside the cell
Releasing useful energy
•
•
Provide energy for necessary
activities.
E.g moving mineral ions into
the root hairs.
Making cellulose
•
•
To grow the plant new cells shall
form, and they all need cell wall
which is made by cellulose.
Cellulose is made by linking
glucose
Making other substances
•
•
•
Glucose also involved in making
chlorophyll.
They also need Mg ions and NO3
ions.
If there is a less chlorophyll, plant
cant process photosynthesis.
Making sucrose
•
•
•
They change glucose into sucrose
which is a sugar made of glucose and
fructose linked together.
The sucrose is delivered from one
part of a plant to another by phloem
tubes.
It can change back into glucose.
Making nectar
•
•
They make a use of other
animals/insects to carry their pollen
grain to another flower to reproduce.
They produce nectar which is made
of glucose to attract pollinators.
Making amino acids
•
•
•
Plants use glucose to ,make amino
acids which can be used to make
proteins.
Glucose→ carbon, hydrogen,
oxygen
Soil→ nitrogen
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