water tray??? (~ 3 minutes)
Cover your tray or will dry out at window
Observations (see): color, new features, growth
Measurements: (mm, cm) stem leaf root

AIM: How does photosynthesis occur?
OBJ: Given notes, 3 experiments and activity sheet SWBAT explain the process of photosynthesis in plants with 70% accuracy.
DN: Seed Journal (~ 3 minutes);
HW check- Photosynthesis & Light Booklet.
College Style Lab Review Results:
Elodea CO2 Test, Guess Which Gas, Light & Starch
HW: Complete Photosynthesis in Plants Lab (due Monday).
Work on Plant Activity Sheet, Plant Exam Oct 16.

For Elodea CO
2
Test:
Bromothymol Blue: Yellow indicates CO
2 present
For Guess Which Gas?
Baking Soda + Water = CO
2
GAS
Liquids – more dense, sinks; Gas – less dense, rises
For Light & Starch (letter E) Test:
Note: iodine ─ dark leaf – starch (LIGHT) iodine ─ light leaf – NO starch (COVERED)

Title : Photosynthesis in Plants
Problem : How does photosynthesis occur?
Hypothesis : ???
Materials : ?????
Procedure : Explain 3 experiments, namely
1. Elodea CO
2
Test (4 test tubes)
2. Guess Which Gas? (beaker, funnel, test tube)
3. Light & Starch Test (plant, letter “E”)
Results :
1. What did you learn/discover?
(Hint: used Bromothymol Blue for what? Blue color, Yellow color)
(Hint: used Iodine for what? Dark color, Light color)
2. Answer all lab questions.
Abstract Form : complete

Elodea CO2 Test:
Guess Which Gas:
Light & Starch “E”:

(steps taken):
Elodea CO2 Test:
Guess Which Gas:
Light & Starch “E”:

(learn/discover):
Elodea CO
2
Test:
Guess Which Gas:
Light & Starch “E”:
Answer All Lab Questions.

2

2

RESULTS :
Dark part of leaf = light present, starch produced
Light part of leaf (covered) = No light, no starch
CONCLUSION :
Light required for photosynthesis
Light required to produce starch (food)

State three science concepts that you learned based on this lab:
WRONG STATEMENTS
1. I learned about mass and how to calculate mass.
2. I learned about volume and how to find volume.
3. I learned about density and how to calculate density.
CORRECT STATEMENTS:
1. I learned that mass is the amount of matter (atoms) in a substance and it is measured using a balance (unit: grams).
2. I learned that volume is the space an object occupies and for cubic/ rectangular solids we use a ruler where V = LxWxH; for irregular objects (cork, pebble) we use a graduated cylinder
(water displacement method) to find volume.
3. I learned that density is the amount of mass divided by the amount of volume; it represents the internal atomic arrangement of atoms in a substance