Igcse Model Questions Vol1 2022 Biology Question 5

Practice essay / theory question 5 from the 2022 Igcse Model Questions Vol1 Biology examination. This question covers Transport in plants, Transpiration, Water potential .

Igcse Model Questions Vol1 2022 Biology Essay / Theory

Topics: Transport in plants Transpiration Water potential

Question 5 IGCSE_MODEL_QUESTIONS_VOL1 • 2022 • BIOLOGY • essay

A flowering plant is growing in a greenhouse where the temperature is 30 °C and the relative humidity is 40 %. The plant has broad leaves with a waxy cuticle and numerous stomata on the underside of the leaf. The soil water potential is –0.3 MPa and the atmospheric water potential is –1.5 MPa. Answer the following:

Question Parts

( a )

Explain, using the concept of water potential, how water moves from the soil to the leaf mesophyll cells.

( b )

Discuss two structural adaptations of the leaf that help to minimise water loss under the given conditions.

( c )

Predict how a sudden increase in temperature to 35 °C, while humidity remains at 40 %, would affect the rate of transpiration and explain the physiological consequence for the plant.

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About This Question

This is Igcse Model Questions Vol1 2022 Biology Question 5. It is one of the essay questions from the 2022 Igcse Model Questions Vol1 Biology examination.

The question covers Transport in plants, Transpiration, Water potential .

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