ACTIVITY 81: A PRODUCER’S SOURCE OF ENERGY

Challenge How do scientist’s study the role of light in photosynthesis?

Important Vocabulary:Photosynthesis

ProducerElodea

GETTING STARTED: TALKING DRAWING #1

How do producers, such as phytoplankton and plants, produce food?

READ INTRODUCTION ON PAGE E-50.

What evidence must have been required to discover the process of photosynthesis?

Evidence for water?

Evidence for Light?

Evidence for sugar being produced?

Evidence for use of Carbon dioxide and production of Oxygen?

These ideas were difficult for scientists too!! They had to

investigate the uptake of CO2 and production of Oxygen

Is light necessary for photosynthesis?

What evidence do you have for your ideas?

How do you think you could collect evidence to support or disprove these ideas?

PHOTOSYNTHESIS – WORD EQUATION *COPY INTO YOUR JOURNAL*

• sunlight

Carbon + Water Food + Oxygen Dioxide

CO2 + H2O (yield) O2

What actually is the food?sunlight

6 CO2 + 6 H2O C6 H12 O6 + 6O2

GLUCOSE

(FOOD!)

WHAT IS BTB? – RECORD IN YOUR NOTEBOOK!

BTB stands for bromothymol Blue.

BTB is a carbon dioxide indicator

Initial BTB color

Final BTB color

Color change show presence of what gas?

Person exhaled into BTB solution

DATA TABLE 1: Results with BTB

AFTER YOUR HYPOTHESIS

Look at vialsL= LightC= Control D= Dark

Predictions:

L= Will photosynthesize and the water will turn blueC = Will remain the sameD= Will remain the same (No photosynthesis)

SHOULD LOOK LIKE…WHICH IS WHICH?

RECORDING OBSERVATIONS- PART B

Exposed to Light In the Dark (Aluminum)

Initial

Final

ANALYSIS QUESTIONS

Discuss #s 1, 2 and 4 with your tables and record the answers in your journal.