Photosynthesis and cellular respiration are important biological processes. Photosynthesis occurs in chloroplasts and uses carbon dioxide, water, and sunlight to produce glucose and oxygen. Cellular respiration takes place in mitochondria and breaks down glucose to produce energy in the form of ATP while releasing carbon dioxide and water. These two processes are essential as photosynthesis produces oxygen and food for organisms while cellular respiration releases energy that can power life.

1. SCIENCE 9
TOPIC 8:
Photosynthesis and
Respiration

2.  Photosynthesis definition states that the process
exclusively takes place in the chloroplasts through
photosynthetic pigments such as chlorophyll a,
chlorophyll b, carotene and xanthophyll.
 All green plants and a few other autotrophic
synthesize
organisms utilize photosynthesis to
nutrients by using carbon dioxide, water and
sunlight. The by-product of the photosynthesis
process is oxygen.
What isphotosynthesis?

4.  The word “photosynthesis” is derived from the
Greek words phōs (pronounced: “fos”)
and σύνθεσις(pronounced: “synthesis“)
 Phōs means “light”
“combining together.”
and σύνθεσις means,
This means “combining
together with the help of light.”
What IsPhotosynthesis in
Biology?

5. A visual representation of the
photosynthesis reaction

6.  Plants capture light energy and use that
energy to make glucose.
 Sunlight provides the energy needed by
chlorophyll to change molecules of carbon
dioxide and water into glucose.
 Oxygen is also released in this reaction.
What happens during
photosynthesis?

7. (glucose, energy), we must get
 We cannot make our own food
our
from plants. Plants are the first step in
the food chain.
 The oxygen
photosynthesis
living things.
released during
is necessary for all
Why isthis important to us?

8.  Which organelle in the cell does photosynthesis?
Chloroplast – creates products for energy
 What conversion of energy takes place?
Light energy (sunlight) to chemical
(glucose)
 What organisms do photosynthesis?
energy
Autotrophs (auto means self anything that
makes its own food)

9.  The release of chemical energy for use by
cells.
 Once the energy that was in sunlight is
transform the chemical energy
photosynthesis, an organism has
into
changed into chemical energy by
to
a
form that can be used by the organism.
What iscellular respiration?

11.  The breakdown of glucose molecules
to release energy.
 Takes place in all living things
 It is a step by step process
Describe Cellular Respiration

12. Chemical equation for Cellular
Respiration

13.  Where in the cell does respiration take place?
Mitochondria
 How do chloroplast and mitochondria
compare?
They both make energy
 What is the energy source that is created?
Glucose is converted into ATP