Biology
How would you demonstrate that green plants release oxygen when exposed to light?
Answer
- Place some water plants (Elodea or Hydrilla) in a beaker containing pond water and cover them by a short-stemmed funnel.
- Invert a test-tube full of water over the stem of the funnel. (Ensure that the level of water in the beaker is above the level of stem of the inverted funnel).
- Place the apparatus in the sun for a few hours. Bubbles of the gas will collect in the test-tube.
- Test the gas in the test-tube. A glowing splinter bursts into flame which shows the presence of oxygen.
Related Questions
Distinguish between the following pairs on the basis of words indicated in the brackets ( )
Grass and Grasshopper (mode of nutrition)
Distinguish between the following pairs on the basis of words indicated in the brackets ( )
Stoma and Stroma (structure)
Describe the main chemical changes which occur during photosynthesis in
- Light reaction
- Dark reaction
Given below is a schematic diagram to illustrate some aspects of photosynthesis.
(a) Fill up the gaps, in blank spaces (1-4), by writing the names of the correct items.
(b) What phenomenon do the thick arrows A and B indicate?
