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DATE: 20/6/2019
TIME: 10:05 a.m. 11:20 a.m.
FORM: 4th Form
DURATION:160 minutes
SUBJECT: CCSLC Integrated Science
AGE RANGE: 13-15 years
TOPIC: Photosynthesis
Generalization: the process by which green plants and some other organisms use sunlight to
synthesize foods from carbon dioxide and water.
Concepts: light reaction, chloroplast, chlorophyll, starch and iodine solution.
PRIOR KNOWLEDGE: Photosynthesis is third form.
Define photosynthesis
State all the reactants ,conditions and products of the photosynthesis reaction.
Work cooperatively to determine the rate of photosynthesis in the leaf samples given.
Demonstration, and Lecture recitation , Educational game and Experimentation
 Iodine
 Beaker
 Alcohol
 A Leaf
 Multi media
 Hdmi cable
 Laptop
Students will be seated quickly and will be shown a slide show presentation depicting
photosynthesis. Then the students will be asked what are we learning today.
Instruct students to get into groups of four to complete the learning activities.
Instruct the students to identify the item placed on their tables. The expected response
is that it is a leaf.
Ask the students to think about and then state in their respective groups what is the
use of the leaf in terms of keeping the plant alive. The expected response is that the
plant uses the leaf to make energy and food from the sun.
Ask the students to create a definition for photosynthesis individually. The expected
response is that photosynthesis in the process by which green plants make food using
the sunlight.
Show the students the chemical equation for photosynthesis. Focus on the reactants
and the products.
Ask the students to think individually about where the carbon dioxide and water
comes from. The expected responses are that carbon dioxide from the air and the
water came from the rain.
Explain to the students that glucose is stored in the leaf in the form of starch for when
ever the plant needs it.
Inquire of the students that testing for the presence of starch is directly related to what
? The expected response is that it measures the rate of photosynthesis.
Ask the students to sit quietly in their suits and watch the video on how to measure
photosynthesis by testing for the presence of starch.
Instruct the students to complete the lab in groups and record all the observations by
following the instructions on the lab template.
Ask the students to predict the pattern of starch distribution in the variegated leaf and
the leaves of non green pigmentation. The expected responses are that starch would be
located in the green portion of the leaf only in the variegated leaf and in the leaf of
non green pigmentation the starch would be distributed equally within the leaf but
there is a lower concentration of starch.
Instruct students play a game of zonks in which questions are answered and students
win points by answering it correctly.
Instruct the students to complete the lab write up for homework to be graded.
Zonk game used to orally assess the students.
Lab write up to be graded.
Students will be questioned will by a teacher.
Define photosynthesis
State the reactants and products of photosynthesis
Describe was process is used to test the rate of photosynthesis.
Explain the results of starch test in variegated leaves and non green leaves.
Ask the students to read the following passage from the text book.
Slideshow to be shown to student at the set induction.
Video showing the importance of washing your hands.