Question

What materials are required to prove that oxygen is produced during photosynthesis in the presence of light ? What procedure we need to follow to perform the above experiment ?​

Answer 1

Explanation:

AIM: To prove that oxygen is produced during photosynthesis in the presence of sun light

APPARATUS: Beaker, water, testtube hydrilla , short stemmed funnel, match stick

EQUATION: 6CO2 + 12H2O gives rises through sunlight and chlorophyll to C6H12O6,(GLUCOSE)+6H2O+6O2

PROCEDURE:

• Make two identical sets
• Take a glass Beaker with water
• Place hydrilla plant bits in a short stemmed funnel and keep this funnel inverted position into beaker with water
• Carefully , invert a test tube with full of water over the stem of the funnel
• Place one apparatus in the sun and other in the dark for atleast 2-3 hours.

OBSERVATION: We observe in place of water air fills in the setup kept in the sun. No gas is filled in the set up kept in dark

TEST FOR GAS: Test the gas by inserting a glowing match stick or incense stick which would burst into flames.This shows the presence of oxygen

INFERENCE:. This indicates that green plants in release oxygen when exposed to sunlight

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Answer 2

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${\bold{\underline{\underline{Aim \: :}}}}$

To prove that oxygen is produced during photosynthesis by Hydrilla funnel experiment

${\bold{\underline{\underline{Apparatus\: :}}}}$

• Beaker with water
• Test tube
• Funnel
• Hydrilla plant
• Glowing splinter

${\bold{\underline{\underline{Procedure \: :}}}}$

• Arrange the apparatus as shown in the provided attachment
• Place Hydrilla in a short stemmed funnel and keep in a beaker.
• Pour water in the beaker.
• Invert a test tube full of water over the stem of the funnel.
• Remember that level of water in the beaker is above the level of the stem of the inverted funnel.
• Place the whole apparatus in the sunlight for 8 to 9 hours.
• The bubbles are collected at the end of the test tube pushing the water into the beaker.
• After sufficient gas is collected, test tube is taken out of the beaker carefully by closing it with thumb.

${\bold{\underline{\underline{Observation \: :}}}}$

Test the gas in the test tube by inserting a glowing incense stick which would burst into flames.

${\bold{\underline{\underline{Result\: :}}}}$

This shows that oxygen is produced during photosynthesis.

${\bold{\underline{\underline{Precautions\: :}}}}$

• Funnel should be smaller than the beaker
• Care should be taken while removing test tune from the stem of funnel.

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