Aim: To show that oxygen is necessary for the germination of seeds with equation
Answers
Explanation:
1 - Place a wet cotton wool in each flask with some soaked Pea seeds. .. In flask A hang a test tube of plain water. Observation: The seeds in flask A germinate because of presence of oxygen and seeds in flask B do not germinate because pyrogallic acid absorbs oxygen. Result: Oxygen is necessary for germination.
2 - Put some germinating seeds in a conical flask. With the help of a thread suspend a small tube containing KOH in the flask. Through the hole of the cork, pass a glass tube bent twice at right angles. One end of the tube is in the flask while the other end is in the beaker filled with water.Make the apparatus airtight. Note the level of water in the tube. Keep the apparatus for some time and note the position of water. It is observed that water rises in the tube. The rise in the level of water is due to a partial vacuum created in the flask because the gas produced during respiration is absorbed by KOH. This shows that germinating seeds produce CO2 during aerobic respiration as KOH can absorb CO2. This is aerobic respiration as KOH can absorb CO2 produced by seeds using air available.