pH Changes in Response to Photosynthesis & Respiration

What color does BTB turn at pH values below 6?

• Blue

• Green

• Yellow

• Red

What is the main purpose of using Bromothymol Blue in the experiment?

• To measure the sugar levels in the plant

• To observe the pH changes during photosynthesis and respiration

• To increase the rate of photosynthesis

• To decrease the water's acidity

What does the presence of a plant in the vials influence during the experiment?

• The size of the vials

• The temperature of the water

• The color of the BTB

• The light intensity

What trend was observed in the pH levels during the experiment when exposed to light?

• pH levels decreased

• pH levels remained constant

• No change was observed

• pH levels increased then leveled off

What was the final pH value of the plant vial in the light that was never opened?

• 7.00

• 6.35

• 7.59

• 6.63

What type of control was used?

• positive control

• negative control

• neutral control

When photosynthesis increases, CO2 should go ______ and pH should go ______.

• down, up

• up, down

• up, up

• down, down