Ijmb Model Questions Vol1 2018 Biology Question 5

Practice essay / theory question 5 from the 2018 Ijmb Model Questions Vol1 Biology examination. This question covers Plant transport, Xylem and phloem structure, Human blood transport, Hemoglobin function, Physiological adaptation to exercise .

Ijmb Model Questions Vol1 2018 Biology Essay / Theory
Topics: Plant transport Xylem and phloem structure Human blood transport Hemoglobin function Physiological adaptation to exercise
Question 5 IJMB_MODEL_QUESTIONS_VOL1 • 2018 • BIOLOGY • essay

Consider the processes of transport of water and minerals in a flowering plant and the transport of nutrients and gases in the human circulatory system.

Question Parts

( a )
Explain the cohesion‑tension mechanism that drives the upward movement of water in the xylem and list two environmental factors that can impede this movement.
( b )
Compare the structural differences between xylem vessels and phloem sieve tubes with respect to cell‑wall composition and the presence of a living protoplast.
( c )
Describe how oxygen is transported from the alveoli to peripheral tissues in the human circulatory system, emphasizing the role of haemoglobin and the partial pressure gradient.
( d )
Discuss two physiological adaptations of the circulatory system that occur during increased physical activity.

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About This Question

This is Ijmb Model Questions Vol1 2018 Biology Question 5. It is one of the essay questions from the 2018 Ijmb Model Questions Vol1 Biology examination.

The question covers Plant transport, Xylem and phloem structure, Human blood transport, Hemoglobin function, Physiological adaptation to exercise .

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