Green Plants make food during the
process of Photosynthesis
= Light and Synthesis
= Making Something) or using sunlight.
Photosynthesis takes place in green
Plants feed themselves by using
the light to convert carbon dioxide
and water into food and oxygen.
Catching light is therefore a very
important part of the plants growing
Plants are built to go through
a life cycle. There are four
main parts to a plant that complete
the four life processes:
- the flower is necessary
for the Reproduction.
This is where seeds are
produced. Seeds will grow
into new plants when they are
in the ground. The flowers
have color and smell to help attract
insects. They make pollen (male
sex cells) which join to the eggs
(female sex cells). The pollen
is carried by flying insects as
they travel from flower to flower
despositing of the pollen collected
on them. Part of the flower then
dies and what is left becomes
the new fruit which contains the
seeds. Seeds are scattered by
the wind, by different animals
and be being flicked out of their
pods. Scattered seeds often
cover a wide area. If a seed falls
slowly it has a better chance
of being carried further by the
- the leaves help plants to grow,
they take in water, sunlight and
carbon dioxide to make food for
the plant. There are little
veins inside the leaves that carry
the water and minerals to the
stem of the plant. Leaves
are necessary for Nutrition
(feeding). The green chlorophyll
(is already in green leaves) in
the leaves absorbs the sunlight
to change carbon dioxide gas and
water into food. This part of
the life process is called photosynthesis.
- the stem is necessary to Hold
the plant upright towards the
sunlight. The stem supports the
plant and carries water, mimerals
and food between the roots, the
leaves and the flowers. The stem
has tiny tubes in it which take
water and nutrients up the plant
to the leaves and flowers.
It grows towards the sunlight.
- the roots are necessary to help
plants to grow, they take in water
and minerals from the soil.
Roots are needed for Anchoring
the plant. The roots anchor
the plant in the ground so it
doesn’t blow away. The roots
have root hairs
(smaller roots) to spread out
through the soil to soak up and
absorb water and minerals from
the soil. The roots are therefore
needed for nutrition (feeding).
Some water is lost through the
pores in the plants leaves.
With the right conditions of water,
light, oxygen (air), minerals and
temperature a plant can grow and
The Life Cycle of a
- Getting Pollen
to land on the sticky Stigma
is called Pollination. Pollen
is carried from the Stamens to
the female stigma. Pollination
occurs when pollen from the Stamens
becomes attached to the Stigma.
Pollen is carried by the wind
and by insects. Some plants
are self pollinating while other
plants are cross pollinating.
- Once pollination has occured,
the pollen grain (male sex cell)
and the egg (female sex cell)
join together to become seeds.
The pollen grain travels down
tube of the Stigma to the ovary
where the eggs are. The
seeds develop when the male sex
cells (pollen) fuse or join together
with the female sex cells and
become seeds - this is called
is the joining of teh Pollen and
the Egg to become a seed.
- The fertilised egg becomes a
seed. As the flower (petals)
dies it leaves behind a fruit
with seeds. The ovary contains
seeds and becomes fruit.
Some fruits produced are soft
and juicy while others are dry
and tough. It is now time
for the seeds to get on with the
important business of growing
into new plants.
Dispersal - the seeds
need to spread out and be scattered
so that they can grow with less
competion from each other and
from the parent plant to help
stop the overcrowding. Different
seeds are dispersed in different
ways. Seeds can travel by
the wind as the fruits are light
and feathery so get blown.
Juicy or sticky fruits can be
carried on animal fur, and some
fruit skin (pod) dries up and
splits open so the seeds shoot
out by explosion.
- the seeds start to grow when
they reach a suitable place. The
seeds need three conditions to
germinate properly; water, oxygen
and warmth (WOW). Germination
is the when the baby plant (seed)
starts to grow, teh seed cracks
and a tiny root grows downwards
into the soil. The seed grows
and sprouts its main root from
the nutrients it is collecting
in the soil. A tiny shoot
grows up towards the light an
then it develops green leaves
so it can start making its own
food through photosynthesis.
do not need light to germinate
(to start to grow) because a seed
has its own store of food.
This store of food helps it to
grow until its leaves are developed).
- the plant grows and develops
a flower. Flowers may look different
but they have similar parts and
each part has a very important
job to do in the life cycle of
a flower. Insects are attracted
to the flowers by their bright
colored petals and their scent.
The insects are looking for nectar
and get covered in pollen and
carry it to the female stigma.
Chlorophyll photosynthesis produces
oxygen present in the Earth's atmosphere.
Photosynthesis is a chemical reaction
that happens in algae and plants.
Photosynthesis is of great importance
for our planet Earth and all its inhabitants
because of its production of sugars,
oxygen and foods.
Plants make food during the process
of photosynthesis and all animals
depend on plants for their food.
Some plants live in water and some
plants live in the desert.