Light Intensity And PhotosynthesisDocument Transcript
Lesson title: Light Intensity and Photosynthesis
Class: 11a2 Date:23rd Nov Period: 3 No. Pupils: 16 Boys: 3 Girls:13
Lesson Objectives (WALT):
Light energy is absorbed by chlorophyll in green plants and used to convert carbon
dioxide and water to oxygen and glucose
Time Activity Content / Notes (key points, questions to ask, assessment of learning, safety)
Before Have all the equipment where needed.
11.14 Starter 6 Recall the factors which affect photosynthesis. If we want to vary light and
mins see the effect what needs to be in good supply and how will we do this?
11.20 Main Outline the practical with discussion on variables, errors, validity etc.
activity 1 Students to draw own results table which is then marked in class. Students
1.5 lessons need to add sodium bicarbonate to provide a ready supply of co2 to make
sure this does not limit the rate.
It’s also a good idea to get the students to practice setting up the experiment
so they know exactly what to do next lesson.
Lesson 2 – collect data and draw graph. Suggest move lamp back from 0 to
about 70cm and count bubbles produced for a minute every 10cm with three
Plenary Discuss results and what this shows- due the graphs looked like they would
Risk Assessment Homework Vocabulary (key words)
Links with previous lessons
Builds on ideas about limiting factors
• Photosynthesis is summarised by the equation: carbon dioxide + water (+ light energy) =
glucose + oxygen
− light energy is absorbed by a green substance called chlorophyll which is found in chloroplasts
in some plant cells this energy is used by converting carbon dioxide and waterinto sugar (glucose)
− oxygen is released as a by-product.
Elodea, Sodium bicarbonate, Spatulas, Paper clips, Boiling tubes, 250ml glass beakers
Meter rules, Stopwatches, lamps, Graph paper