Activity 10.5 Let us explore (Page 145) Fig. 10.4 Activity showing the release of oxygen during photosynthesis Class 7

Activity 10.5 Let us explore (Page 145) Class 7

Activity 10.5 Let us explore (Page 145) Class 7

Fig. 10.4: Activity showing the release of oxygen during photosynthesis

(i) What difference do you observe in the two set-ups?

Answer:

In set-up A (kept in sunlight), we observe bubbles on the inverted test tube. While in set-up B (kept in the dark), no bubbles are seen.

(ii) Do you observe air bubbles emerging in the inverted test tube in set-up A?

Answer:

Yes, air bubbles are seen rising and collecting in the inverted test tube in set-up A.

(iii) The gas produced in this set-up caused bubbles to emerge and get accumulated in the inverted test tube. Which gas is this?

Answer:

The gas produced is oxygen, which is released during photosynthesis.

Observation: When a test tube is taken off the set-up and a lit matchstick is inserted into the tube, it produces an intense flame.

Conclusion: It confirms that during the process of photosynthesis oxygen gas is released.