Gce Model Questions Vol1 2022 Biology Question 5

Practice essay / theory question 5 from the 2022 Gce Model Questions Vol1 Biology examination. This question covers Human circulatory system, Plant transport .

Gce Model Questions Vol1 2022 Biology Essay / Theory

Topics: Human circulatory system Plant transport

Question 5 GCE_MODEL_QUESTIONS_VOL1 • 2022 • BIOLOGY • essay

The human circulatory system and the vascular tissues of plants are specialised for the transport of substances essential for life.

Question Parts

( a )

Describe the structural adaptations of the heart and blood vessels that facilitate efficient transport of blood throughout the body.

( b )

Explain how the mechanisms of transport in the xylem differ from those in the phloem, giving at least two distinct differences.

( c )

A resting adult has an oxygen consumption (VO₂) of 250 ml min⁻¹. The arterial oxygen content is 0.20 ml O₂ ml⁻¹ blood and the venous oxygen content is 0.15 ml O₂ ml⁻¹ blood. Calculate the cardiac output required to meet this oxygen demand. Show all steps and comment on how the value would change if the subject performed moderate exercise increasing VO₂ to 750 ml min⁻¹.

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About This Question

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

The question covers Human circulatory system, Plant transport .

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