Natural Sciences: photosynthesis

1. 

Photosynthesis
Presented by Sithembile Bhengu

2.  It is the process by which autotrophic organisms use
light energy to make sugar and oxygen gas from
carbon dioxide and water.
 Basically, it is a process where plants make their own
food
 Photo means light
 Synthesize means to make
What is photosynthesis?

3. Plants or producers
Who uses photosynthesis?

4.  Photosynthesis occurs in chloroplasts, organelles
in certain plants which are inside the cells of the
stem and leaves of green plants
 All green plants have chloroplast so they can
photosynthesize
 The leaves have the most chloroplasts
 The green color of the plants comes from
chlorophyll which is the pigment in the
chloroplasts
 Chlorophyll also absorb light energy
Where do photosynthesis takes
place?

5. Where do photosynthesis takes place?

6. Plants need the following resources in
order to complete photosynthesis:
1. Sun:
 chlorophyll in leaves absorb sunlight
energy
RESOURCES REQUIRED INORDER TO
PHOTOSYNTHESIZE

7. 2. Water:
plant roots absorb water from the soil
RESOURCES REQUIRED INORDER TO
PHOTOSYNTHESIZE

8. 3. Carbon dioxide:
plants absorb carbon dioxide from the
air, gases are absorbed and released
through the plant’s leaves.
RESOURCES REQUIRED INORDER TO
PHOTOSYNTHESIZE

9.  Plants use radiant energy from the Sun in a
series of chemical reactions to change carbon
dioxide from the air and water from the soil
into glucose. The process releases oxygen.
 Therefore the products of photosynthesis are:
Glucose (a sugar or a simplest form of food)
Oxygen ( which is released as a waste
product
PRODUCTS OF PHOTOSYNTHESIS

10. Process of photosynthesis can also be
presented in of form of an equation:
EQUATION FOR PHOTOSYNTHESIS

11.  The glucose that a plant produces during
photosynthesis is the food for the plant.
 The plant can use this glucose directly, and release
the energy during its own respiration or it can store
the glucose or convert it into other chemical
compounds.
 Glucose is soluble in water meaning it can dissolve in
water, which helps the plant to transport glucose to
other parts of the plant that requires it
What happens to glucose after
photosynthesis?

12.  The glucose that a plant produces during
photosynthesis is the food for the plant.
 The plant can use this glucose directly, and release
the energy during its own respiration or it can store
the glucose or convert it into other chemical
compounds.
 Glucose is soluble in water meaning it can dissolve in
water, which helps the plant to transport glucose to
other parts of the plant that requires it
What happens to glucose after
photosynthesis?

13.  in order for plants to store large amounts of glucose they
need to convert it into compounds which
are insoluble (cannot dissolve in water).
 Therefore the plant converts glucose into starch, which is
insoluble in water.
 plants also convert glucose into cellulose. Cellulose is used
to support and strengthen plants
 Glucose is also converted into other chemical compounds
that enable processes in the plant such as reproduction and
growth.
 Glucose tastes sweet but starch does not taste sweet at all.
 Glucose will dissolve in water while starch will not dissolve in
water.

14. Aluba, J. (2015). Photosynthesis. Available from:
https://www.slideshare.net/alubajessabeth/photoynthesis-
48226463?qid=84056eed-8c61-44d-&bdbs-2ea3a649843c&v=&b=&from-
search=46 .
Cecile, C. (2015). Photosynthesis. Avalable from:
https://www.slideshare.net/christa-belle/photosynthesis-
43829124?qid=ec0a5543-32bd-4baa-88a-d766d73a8cc9&v=&b=&from-
search=7.
Ganyaza, Z. (2014). Presentation photosythesis. Available from:
https://www.slideshre.net/ntsingizi724/presentation-photosynthesis
Pointer, K. (2011). Photosynthesis. Available from:
https://www.slideshare.net/coachpointer/photosynthesis-
7346091?qid=ec0a5543-32bd-4baa--88a9-d7398cc9&v=&b=&from-
search=26.
Vidallo, E. (2015). Photosynthesis. Available from:
https://www.slideshare.net/conan-emanz/photosynthesis-
51038295?qid=ec0a5543-32bd-4baa-88a9-d76673a8cc9&v=&b=&from-
search-13 .
Reference list

15. Thank you for attention !