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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