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Biology Form 2 Topical Questions and Answers on Gaseous Exchange in Plants and Animals

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Biology topical questions and answers.
Class: Form 2
Topic 2: Gaseous exchange in plants and animals.

BIOLOGY TOPICAL QUESTIONS AND ANSWERS.
CLASS: FORM 2
TOPIC 2: GASEOUS EXCHANGE IN PLANTS AND ANIMALS.
1. Explain what happens when diaphragm muscles contract during breathing in mammals.
Diaphragm flattens, this increases the volume of thoracic / chest cavity, hence decreasing the pressure in the chest.
2. State one way in which floating leaves of aquatic plants are adapted to gaseous exchange.
They have aerenchyma cells for buoyancy.
3. State three sites of gaseous exchange in mesophytes.
Stomata ;
lenticel ;
Cuticular surface;..............................................

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