Photosynthesis and Gas Evolution

Photosynthesis and Gas Evolution

Assessment

Interactive Video

Biology

7th - 8th Grade

Hard

Created by

Patricia Brown

FREE Resource

The video demonstrates an experiment to verify the gas released during photosynthesis using a Hydrilla plant. Two setups are prepared, one in sunlight and the other in darkness. After two hours, the gas collected is tested with a burning matchstick. The setup in sunlight shows oxygen production, while the one in darkness shows carbon dioxide. The experiment concludes that plants emit oxygen during photosynthesis in light and carbon dioxide in the absence of light.

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the primary objective of the Hydrilla experiment?

To determine if the gas released during photosynthesis is oxygen.

To measure the growth rate of Hydrilla plants.

To observe the color change in Hydrilla leaves.

To test the effect of fertilizers on Hydrilla.

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is NOT a material required for the Hydrilla experiment?

Beaker

Funnel

Test tube

Thermometer

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the first step in setting up the Hydrilla experiment?

Place the Hydrilla plant in a funnel.

Tag the setups as A and B.

Fill the beaker with water.

Invert a test tube over the funnel.

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How long should the setups be left undisturbed during the experiment?

30 minutes

1 hour

2 hours

4 hours

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is observed in the test tube of setup A placed in sunlight?

No gas formation

Water level decreases

Water level rises

Gas formation at the top

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What happens to the burning matchstick in the test tube of setup A?

It keeps burning.

It breaks into pieces.

It extinguishes immediately.

It changes color.

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which gas is primarily responsible for the matchstick continuing to burn in setup A?

Oxygen

Nitrogen

Carbon dioxide

Hydrogen

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