an innovative approach

Table 4.1 Cont’d
Lesson
4. Light
dependent
(light)
phase
Periods
(min)
1.5
(75)
Learning outcomes Concepts
Students would be
able to…
1. Identify the
products of the
light phase.
2. Explain roles of
light, pigment,
water and
electron
transport system
in the light
phase.
3. Distinguish
between the
cyclic ETS and
the non-cyclic
ETS.
4. Tell the
importance of
changing
development of
the light phase.
1. Light dependent reactions occur in thylakoid
membrane when light energy excites specialized
chlorophyll from the ground electronic state to an
excited electronic state.
2. Primary photochemical event is the transfer of an
electron from the excited state of chlorophyll in
the reaction centre to an acceptor molecule.
3. The oxidized reaction centre of the chlorophyll,
that had donated an electron, is reduced by a
secondary donor, which in turn is reduced by a
tertiary donor.
4. The water (H2O) is oxidized by light (photolysis)
to oxygen. The oxidation of water as the primary
source of electrons. Protons also are released in
the lumen by PS-II.
5. The primary electron and proton are transferred
from chlorophyll of the PS-II to chlorophyll of
the PS-I that had donated the electron. This is
called non-cyclic electron transfer.
6. The electron in PS-I is transferred through
electron protein carriers, and return to PS-I again.
This is called cyclic electron transfer.
7. Then, ATP is released into the stroma by proton
(H + ) moving from the lumen to stroma.
8. In plant, water (H2O) is the ultimate electron
donor, and NADP + is the ultimate electron
acceptor.Moving electrons, electron flow, to
synthesize ATP is called Z scheme.
9. PS-II oxidizes water, while PS-I reduces NADP+.
Learning
Activities
1. Questioning
2. Cooperative
learning
3. Story telling
using
pamphlet
4. Group
discussion
5. Concept
mapping
Materials Assessment
1. The
pamphlet:
Van Neil,
Arnon and
Hill
2. The concept
mapping
118
1. Use the pamphlet:
Van Neil, Arnon
and Hill to probe
the students’ ideas
about the light
phase.
2. Use concept
mapping to
evaluate the
students’
conceptions about
the light phase.
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