This document discusses photosynthesis in plants. It describes that photosynthesis occurs in chloroplasts in plant leaves. The chloroplast contains thylakoids that are stacked to form grana. Photosynthesis has two parts - the light reaction which occurs in the grana and converts light energy to chemical energy in ATP, and the dark reaction which occurs in the chloroplast stroma and uses the energy from the light reaction to combine carbon from CO2 with hydrogen from water to form glucose. The overall equation for photosynthesis is provided.

1. KERALA UNIVERSITY
COLLEGE OF TEACHER
EDUCATION,
NEDUMANGAD,
2013-2014.
SARATH.S
Reg. No.
13983026
Natural Science

2. WELCOME

7. Most plants, most algae and
cyanobacteria perform photosynthesis
and such organisms are called
photoautotrophs.

8. Raw materials for photosynthesis
CO2 - Enter the leaves through pores called
stomata.
Water - It is delivered to the leaves from the
roots through a vascular system.
Chlorophyll - It is seen in the chloroplast.

9.  Chloroplasts are the green plastids.
 They occur in all green parts of plants
mainly in the mesophyll cells of leaves.
 They are surrounded by a double
membrane system.

10.  Inside the chloroplast is the
stroma, a protein rich gel like
material.
 Running through the stroma is a
series of membranes called
thylakoids.
 At certain regions the thylakoid
membranes are stacked one above
the another forming grana.

11. The process of photosynthesis can
be divided into two parts.
1. Light reactions
2. Dark reactions

13.  It is takes place in the grana of the
chloroplast.
 This occurs only in the presence of light.
 In this phase, light energy is converted to
chemical energy contained in ATP molecule.
 In this phase water is broken down into
hydrogen and oxygen utilizing light energy.

14.  It is takes place in the stroma of the
chloroplast.
 In this phase do not require light.
 The hydrogen atoms that are released
by the break down of water molecules
during the light reaction combines with
the carbon atoms from CO2 molecules for
the synthesis of glucose.

15. The overall process of photosynthesis
can be represented by the formula.
6 CO2 + 12 H2O light energy
Chlorophyll
C6 H12 O6 + 6H2O + 6O2