← Biology syllabus

SingaporeBiology

Transport in Humans and Plants

4 dot points across 4 inquiry questions. Click any dot point for a focused answer with worked past exam questions where available.

What is blood made of, and what does each part do?

Describe the components of blood and explain the functions of red cells, white cells, platelets and plasma
A focused answer to the O-Level Biology outcome on blood. The four components (red cells, white cells, platelets and plasma), how red cells are adapted to carry oxygen, and how blood transports, defends and clots.
8 min answer →

How is the heart built to pump blood, and how are the three blood vessels suited to their jobs?

Describe the structure of the heart and relate arteries, veins and capillaries to their functions
A focused answer to the O-Level Biology outcome on the heart and blood vessels. The chambers and valves of the heart, why the left ventricle is thicker, and how arteries, veins and capillaries are each adapted.
8 min answer →

How does blood travel around the human body, and why does it pass through the heart twice?

Describe the double circulatory system in humans and the path of blood around the body
A focused answer to the O-Level Biology outcome on the human circulation. The double circulatory system, the pulmonary and systemic circuits, the path of blood, and why a double circulation is an advantage.
8 min answer →

How do plants move water and food between their roots, stems and leaves?

Describe transport in plants by xylem and phloem and explain transpiration
A focused answer to the O-Level Biology outcome on plant transport. The roles of xylem and phloem, the transpiration stream that pulls water up, and the factors that affect the rate of transpiration.
8 min answer →