Question

(b) 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.


(i) Name the
gas
that evolved in bright light .
(ii) What is the process in which this gas has evolved?
(iii) Name a plant that can be used in the process.
(iv) Why did the bubbles stop when there was still some light falling on the plant?
(v) Gas is still being produced. Give one reason why gas bubbles are not evolved in darkness.​

Answer 1

Answer:

(i)oxygen

(ii) photosynthesis  

(iii) The bubbles stopped because there wasn't sufficient light for photosynthesis to take place.

(iv)Plant cells respire in the light and the dark, releasing carbon dioxide. In the light, photosynthesis can also happen, and carbon dioxide is absorbed from the air. If the light is bright enough, the rate of absorption becomes greater than the rate of release.

Answer 2

Explanation:

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