Oxygen Production Shows Rate of Photosynthesis - PRACTICAL

Question 1

What plant is used to measure the effect of light intensity on the rate of photosynthesis?

Answer 1

Canadian pondweed

Canadian pondweed is known for its ability to produce oxygen during photosynthesis, making it a suitable subject for such experiments.

Question 2

What is the relationship between the rate of oxygen production and the rate of photosynthesis?

Answer 2

The faster the rate of oxygen production, the faster the rate of photosynthesis

This relationship is key in experiments measuring photosynthetic activity.

Question 3

What is the first step in the experiment involving Canadian pondweed?

Answer 3

Place a source of white light at a specific distance from the pondweed

The distance affects the light intensity received by the plant.

Question 4

What happens to the oxygen produced by the pondweed during the experiment?

Answer 4

It collects in the capillary tube

The collection of bubbles allows for quantification of oxygen production.

Question 5

How is the volume of O2 produced measured in the experiment?

Answer 5

By measuring the length of the gas bubble in the capillary tube

The length of the bubble is proportional to the volume of oxygen produced.

Question 6

What variables should be controlled during the experiment?

Answer 6

Temperature and time the pondweed is left to photosynthesise

Controlling variables ensures accurate and reliable results.

Question 7

What is done after measuring the oxygen produced at a specific distance from the light source?

Answer 7

Repeat the experiment twice with the light source at the same distance

This repetition helps confirm the consistency of the results.

Question 8

What should be done to measure the effect of different distances of the light source?

Answer 8

Repeat the whole experiment with the light source at different distances from the pondweed

This allows for comparison of photosynthesis rates at varying light intensities.

Question 9

How can the experiment be altered to measure the effect of temperature on photosynthesis?

Answer 9

Put the test tube of pondweed into a water bath at a set temperature

This method allows researchers to analyze how temperature affects photosynthetic rates.

Question 10

What substance can be dissolved in water to measure the effect of CO2 on photosynthesis?

Answer 10

Sodium hydrogencarbonate

This compound releases CO2 when dissolved, providing a source of carbon for photosynthesis.

Question 11

Fill in the blank: The length of the gas bubble is measured using a _______.

Answer 11

ruler

A ruler allows for precise measurement of the gas bubble’s length, correlating to oxygen volume.