Hey guys welcome back to another video and
today we’re gonna talk about photosynthesis.
Photosynthesis is the process by which plants
make food.
It is a process that uses sunlight to turn
carbon dioxide into sugar that the cell can
use as energy.
As well as plants, many kinds of algae and
bacteria use it to get food.
I’ll explain more about photosynthesis now.
The carbon dioxide enters the leaf through
the stomata (the lungs of a plant) by diffusion
from the atmosphere.
Photosynthesis occurs in the chloroplast which
is found in leaf cells that contains chlorophyll,
a green pigment that absorbs light energy.
In leaves, The cells have lots of chloroplasts
to capture more light.
This way, the plant can do more photosynthesis.
Oxygen is a waste product of plants but oxygen
is the most important element for us to survive.
Photosynthesis has two main sets of reactions.
Light-dependent reactions need light to do
work and light-independent reactions do not
need light to do work.
An example for a light-dependent-reaction
is light energy from the sun is used to split
the water molecules (a big cluster of atoms).
The sunlight hits chloroplasts in the plant,
causing an enzyme to break apart the water.
Water, when broken, makes oxygen, hydrogen,
and electrons.
Now I’ll give you an example for a light-independent-reaction.
An example for light-independent-reaction
is sugars are built up using carbon dioxide
and the products of the light-dependent reactions.
So, the light-independent reaction
cannot happen without the light-dependent
reactions.
Carbon dioxide diffuses into the plant along
with products of the light-dependent reaction
in the chloroplast, glucose is made and finally
transported around the plant by translocation
(a way to transport molecules).
So let me summarise what we spoke about.
First we learnt what is photosynthesis
Then we learnt that plants have 2 reactions
in photosynthesis which are:
Light-dependent and light-independent reactions.
That’s all I know about photosynthesis so yeah, bye guys!
an outro screen.mp4
