Exploring Plant Pigments and Photosynthesis Techniques

Mr. Anderson introduces an AP Biology lab on plant pigments and photosynthesis. The video covers the basics of photosynthesis, including the light reaction and Calvin cycle. It explains a chromatography lab using spinach to separate plant pigments and measure their RF values. The video also describes an experiment to measure photosynthetic rate using leaf chads and discusses factors affecting photosynthesis. An alternative method using DPIP and a spectrometer is also presented.

What are the two main parts of photosynthesis?

• Light reaction and Calvin cycle

• Electron transport chain and fermentation

• Light reaction and dark reaction

• Glycolysis and Krebs cycle

Tags

NGSS.HS-LS1-5

What is the primary pigment involved in photosynthesis?

• Carotene

• Chlorophyll a

• Xanthophyll

• Chlorophyll b

Tags

NGSS.HS-LS1-5

What is the purpose of chromatography in the lab?

• To measure the rate of photosynthesis

• To determine the temperature effect on photosynthesis

• To separate plant pigments

• To calculate the amount of carbon dioxide

What is the RF value in chromatography?

• The ratio of the solvent to the pigment

• The distance the pigment moves divided by the distance the solvent moves

• The speed at which the solvent evaporates

• The amount of light absorbed by the pigment

What is used to provide carbon dioxide in the leaf chad experiment?

• Baking soda

• Vinegar

• Salt

• Sugar

What happens to the leaf chads when they absorb light energy?

• They float to the top

• They sink to the bottom

• They dissolve in water

• They change color

Tags

NGSS.HS-LS1-5

Which colors of light result in a higher photosynthetic rate?

• Orange and purple

• Red and blue

• White and black

• Green and yellow

Tags

NGSS.HS-LS1-5

How is the photosynthetic rate measured in the leaf chad experiment?

• By observing the color change

• By weighing the chads

• By measuring the time it takes for the chads to float

• By counting the number of bubbles

What role does DPIP play in the alternative photosynthesis lab?

• It measures temperature changes

• It acts as a substitute for NADP+

• It provides carbon dioxide

• It absorbs light energy

Tags

NGSS.HS-LS1-5

How can the rate of photosynthesis be measured using DPIP?

• By weighing the chloroplasts

• By measuring the temperature

• By counting the number of bubbles

• By observing the color change from blue to clear