FREE BioInteractive Measuring Photosynthesis Questions and Answers

Question 1

Which gas is primarily measured to determine the rate of photosynthesis?

Accepted Answer

Carbon dioxide (CO₂)

Answer

Carbon dioxide (CO₂) is a key reactant in photosynthesis, being absorbed from the atmosphere and fixed into organic compounds during the Calvin Cycle. Therefore, measuring the rate of CO₂ uptake by a plant is a direct and common method used to determine its photosynthetic activity and efficiency.

Question 2

What device is commonly used to measure CO₂ uptake during photosynthesis?

Accepted Answer

Infrared Gas Analyzer (IRGA)

Answer

An Infrared Gas Analyzer (IRGA) is a specialized scientific instrument commonly used to measure the concentration of gases like CO₂ and water vapor. In photosynthesis research, IRGAs are crucial for precisely quantifying the rate of CO₂ uptake or release by plants, thereby determining photosynthetic or respiratory rates.

Question 3

What is chlorophyll fluorescence used to assess in photosynthesis?

Accepted Answer

Photosystem II activity

Answer

Chlorophyll fluorescence is a non-invasive technique used to assess the efficiency and activity of Photosystem II (PSII) in photosynthesis. By measuring the re-emitted light from chlorophyll, scientists can gain insights into how effectively light energy is being captured and utilized in the initial stages of photosynthesis, indicating plant stress or health.

Question 4

In an aquatic plant experiment, what does observing oxygen bubbles indicate?

Accepted Answer

Rate of photosynthesis

Answer

Oxygen gas is a significant byproduct of the light-dependent reactions of photosynthesis, released when water molecules are split. Therefore, observing and quantifying the production of oxygen bubbles from an aquatic plant under illuminated conditions directly indicates the rate at which photosynthesis is occurring.

Question 5

Which parameter represents the total CO₂ fixed during photosynthesis without accounting for respiration?

Accepted Answer

Gross photosynthetic rate

Answer

Gross photosynthetic rate represents the total amount of carbon dioxide fixed by photosynthesis, without subtracting the CO₂ released through cellular respiration. It reflects the plant's maximum potential for carbon assimilation before accounting for its own metabolic energy needs.

BioInteractive - Photosynthesis BioInteractive Test Practice Test

BioInteractive - Photosynthesis BioInteractive Test Practice Test

FREE BioInteractive Measuring Photosynthesis Questions and Answers