Describe a simple experiment of show aerobic respiration.

Explanation

Experiment to demonstrate the production of `CO_2` in aerobic respiration.:
1. Take small quantity of any seed (groundnut or bean seeds) and allow them ot germinate by imbibing them . While they are germinarting place them in a conical flask.
2. A small tube containing 4 ml of freshly prepared.
3. Potassium hydroxide (KOH) solution is hung into the conicla flask with the help of a thread and tighly close the one holed cork (Figure).
4. Take a bent glass tube, the shorter end of which is inserted into the conical flask through th hole in the cork, while the longer end is dipped in a breaker containing water.
5. Observe the position of initial water level in bent glass tube.
6. This experimental setup is kept for two hours and the seeds are allowed to germinate.
7. After 2 hours, the level of water rises in the glass tube. it is because, the `CO_2` evolved during aerobic respiration by germinating seeds will be absorbed by KOH solution and the level of water will rise in the glass tube.
`CO_2+2KOHto K_2CO_3+H_2O`

8. In the case of groundnut or bean seeds. the rise of water is relatively lesser because these seeds use fat and proteins as respiratory substrate and release a very small amount of `CO_2`.
9. But in the case of wheat grains, the rise in in water level is greater because they use carbohydrate as respiratory substrate.
10. When carbohydrates are used as substrate, equal amounts of `CO_2 and O_2` are evolved and consumed.