Biology · Oct / Nov 2019 · Paper 11 · Question 28

Four students are studying a pond ecosystem on a bright sunny day. They see the underwater plants giving off bubbles. What is the explanation of this observation?

1. AThe bubbles are carbon dioxide produced during photosynthesis. The plants are getting their energy from the Sun.
2. BThe bubbles are carbon dioxide. The plants are getting their energy for photosynthesis from respiration.
3. CThe bubbles are oxygen produced during photosynthesis. The plants are getting their energy from the Sun.
4. DThe bubbles are oxygen. The plants are getting their energy for photosynthesis from the minerals absorbed through their roots.

As printed in the paper