CAIE A-Level Biology A2 12.2.12 Rice Adaptations to Flooding Questions
Explain rice adaptations to flooding using evidence from each question and mark scheme.
- Syllabus
- 2028–2030
- Course
- Biology 9700
- Level
- A2
Exam points
- Explain rice adaptations to flooding.
CAIE A-Level Biology A2 12.2.12 Rice Adaptations to Flooding Questions question 1
[Maximum number: 3]
The cereal crop rice, Oryza sativa, grows in fields that are flooded with water. The roots of the rice plants are submerged in water that contains very little oxygen.
Describe and explain how rice plants are adapted to grow in flooded fields.
any three from:
1 aerenchyma provides oxygen for aerobic respiration ;
2 high concentration of ethanol dehydrogenase / high tolerance for ethanol, allows (higher rate of), ethanol fermentation / anaerobic respiration ;
3 fast growth / grow tall, so leaves, out of water / exposed to air ;
4 AVP ;
e.g. ridges in submerged leaves to trap air
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