A portion of pond weed was kept in pond water as in the diagram . Bubbles evolved at the cut end of the stem.In dim light and dark no bubbles evolve:(a) Name the gas which is evolved.(b) how can you confirm the presence of gas.(c) why at some time we find no bubble forming even though the plant is still in bright light?(d) what can you expect to happen if NaHCO3 is added to the water?
Answers
Answer:
Explanation:A pond weed was placed in a test tube containing pond
water and was exposed to bright sunlight. Bubbles
evolved at the cut end of the stem as shown in the figure.
In dim light and in darkness, no bubbles evolved.
Bubbles
Bright light
Pond weed
Pond water
(a) Name the gas that evolved in bright light.
(b) What is the process in which this gas has evolved?
(c) Why did the bubbles stop when there was still some
light falling on the plant?
(d) Gas is still being produced. Give one reason why gas
bubbles are not evolved in the darkness.
Hope it helps
Answer:
(a) Oxygen
(b) through Photosynthesis
(c) sufficient amount of light is not there to occur photosynthesis
(d) to occur photosynthesis we need light and the H20 break from PS2 reaction centre and O₂ is released since there is no light so there will be no breaking of H2O and Oxygen will not be release.
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