The grass Oryza sativa is grown as a food crop to produce rice. Rice plants are adapted to grow with their roots submerged in water. Describe and explain two other adaptations of rice plants to growing in flooded fields. . . . . . .

Biology

IGCSE&ALevel

CAIE

Exam No：9700_s25_qp_44 Year：2025 Question No：7(b)

Answer:

Knowledge points:

14.2.1 explain that stomata respond to changes in environmental conditions by opening and closing and that regulation of stomatal aperture balances the need for carbon dioxide uptake by diffusion with the need to minimise water loss by transpiration

14.2.2 explain that stomata have daily rhythms of opening and closing

14.2.3 describe the structure and function of guard cells and explain the mechanism by which they open and close stomata

14.2.4 describe the role of abscisic acid in the closure of stomata during times of water stress, including the role of calcium ions as a second messenger

The grass Oryza sativa is grown as a food crop to produce rice. Rice plants are adapted to grow with their roots submerged in water. Describe and explain two other adaptations of rice plants to growing in flooded fields. . . . . . .

Answer:

Knowledge points:

Solution:

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