Photosynthesis and Gas Evolution

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.

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.

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

• Beaker

• Funnel

• Test tube

• Thermometer

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.

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

• 30 minutes

• 1 hour

• 2 hours

• 4 hours

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

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.

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

• Oxygen

• Nitrogen

• Carbon dioxide

• Hydrogen

What is the main conclusion about gas evolution during photosynthesis in the presence of sunlight?

• Plants emit carbon dioxide.

• Plants emit oxygen.

• Plants emit nitrogen.

• Plants emit hydrogen.

What gas is emitted by plants during photosynthesis in the absence of light?

• Hydrogen

• Nitrogen

• Carbon dioxide

• Oxygen

When does photosynthesis typically occur in the absence of light?

• In the afternoon

• In the morning

• At night

• During the day