Question

Hydrilla experiment (oxygen Is produced during photosynthesis in the presence of light)

Answer 1

INTRODUCTION:The end products of photosynthesis are Oxygen(O2),water and starch.So one of the end products is oxygen ,which is proved by this experiment.

AIM:To prove oxygen is evovled during photosynthesis in the presence of sunlight.

APPARATUS:Beaker,water,test tube,hydrilla plant twigs,funnel and sunlight

PRECAUTION:-Setup should be kept in sunlight
-The level of water in the beaker should be over the level of stem of the inverted funnel
-While removing testtube ,place your thumb near mouth of testtube to prevent escape of gas(oxygen) evolved and remove gently.

PROCEDURE:1)Place hydrilla plant twigs in a short stemmed funnel and keep it in a beaker containing water.
2)Invert a test tube full of water over the stem of the funnel
3)Place the apparatus in the sun for at least 2-3 hours.
4)After sometime observe the apparatus

OBSERVATION:1)Gas bubbles i,e.,oxygen is produced at the end of test tube and remove the test tube gently.
2)Test the gas in the testtube by inserting a glowing incense stick which would burst into flames.
3)This shows the presence of oxygen.

RESULT:By this experiment, we proved that oxygen is produced during photosynthesis in the presence of sunlight.
 

Answer 2

Answer:

Details of the experiment are given in the explanation.

Explanation:

Introduction:-

Green plants create their carbohydrate food through photosynthesis, a physiological process. Photosynthesis takes place in the chloroplasts of green plants' mesophyll tissue. Green plants use energy from the sun, CO2 from the atmosphere, water, and minerals from the soil to prepare their carbohydrate diet and, in turn, produce oxygen during the photosynthesis process.

Aim:-

To prove that green plants produce oxygen during photosynthesis.

Requirements:-

• Hydrilla twigs,
• Beaker,
• a glass funnel,
• a Test tube,
• a beehive arrangement,
• pond water, and
• a glowing splinter.

Procedure:-

1. Fill a beaker 3/4 of the way with pond water.
2. Insert some freshly cut Hydrilla twigs into the nozzle of a glass funnel from below the stem.
3. Invert the funnel and place it in the bottom of the beaker. Between the funnel's base and the bottom of the beaker, a beehive arrangement is used.
4. A test tube is now filled with pond water and inverted over the funnel's stem.
5. When putting this together, keep in mind that the water level in the beaker should be higher than the stem of the inverted funnel.
6. For a while, the entire arrangement is kept on a level surface under direct sunshine.

Result:-

Air bubbles begin to move from the cut end of the Hydrilla twigs and accumulate at the test tube's top end. After some time, we see that the downward displacement of water has accumulated some gas at the top of the inverted test tube. The test tube is swiftly withdrawn from the stem of the funnel and the mouth is closed with the thumb to determine the type of the gas collected. By removing the thumb from the test tube's mouth, a glowing splinter is now introduced into the test tube. The glowing splinter burst into flame right away, showing that the gas in the test tube contains oxygen.

#SPJ2