Transport Systems
GCE Biology

(a) State four components of blood and give one function of each. (8 marks) (b) Describe how oxygen is transported from the lungs to the body tissues in mammals. (5 marks) (c) State two differences be…

(a) (i) What is transpiration? (2 marks) (ii) State three factors that affect the rate of transpiration in plants. (3 marks) (b) Describe the pathway taken by water from the soil to the leaf mesop…

The opening and closing of stomata is directly controlled by the

A student measured the diameter of a cross-section of a plant stem and found that the xylem vessels occupied a total cross-sectional area of $12 \ mm^2$ out of a total stem area of $80 \ mm^2$. What p…

In the human circulatory system, which chamber of the heart generates the highest blood pressure?

During a practical exercise, a student placed a piece of fresh yam in a concentrated salt solution and observed that it became flaccid after 30 minutes. Which of the following best explains this obser…

In an experiment, a radioactive tracer introduced into the leaves of a well-watered plant was detected moving downward through the stem toward the roots. This movement is best explained by

Which of the following correctly describes the role of companion cells in phloem transport?

Which of the following blood vessels carries oxygenated blood from the lungs to the heart?