IGCSE Biology Paper-3: Specimen Questions with Answers 241 - 242 of 358

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Question 241

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Explain digestion of Cellulose in ruminants.

Explanation

  • Digestion of cellulose takes place in caecum of rabbit with the help of enzyme cellulase produced by symbiotic microorganism. Cellulose digestion does not occur in human.
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  • Digestion of cellulose is also found in termites (white ants) . In which symbiotic flagellate Triconympha found in their intestine that secretes enzyme β-glucosidase which hydrolyze the cellulose to sugars which are used by both symbionts.

Question 242

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The lower surface of most leaves has many pores.

The pores allow gases to move into and out of a leaf for photosynthesis.

State the name of the gas that is produced by photosynthesis.

Explanation

Oxygen

Oxygen is released during the process of photosynthesis. Photosynthesis is the process in which green plants produce glucose. It involves the conversion of carbon dioxide gas, water, and minerals the plants take in from their surroundings into sugar and gaseous oxygen. Photosynthesis involves the intake of carbon dioxide and the release of oxygen. The release of oxygen is due to photolysis of water.

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