
The given diagram shows the human heart. Complete the following table to indicate the characteristics of blood flow in regions P, Q, R and S.

Characteristics of blood
Region
High pressure deoxygenated blood
Low-pressure oxygenated blood
High-pressure oxygenated blood
Low pressure deoxygenated blood

High pressure deoxygenated blood
Low-pressure oxygenated blood
Low pressure deoxygenated blood

Important Questions on Transportation in Plants and Animals


The adjacent diagrams show two cells found on the underside of a leaf. Joey did a study on the behaviour of stomata during the day and the night. She noticed that the size of stoma was larger during the day and smaller during the night.
1. What is the function of the stoma in leaves?
2. Why do you think the stoma was smaller during the night?
3. Based on Joey's study, what caused the stoma to change its size?

The following diagram shows the circulatory system of a human being.
The blood vessels above are labelled with letters. State which blood vessel(s) are rich in carbon dioxide.

