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SingaporeBiology

Transport in Organisms

3 dot points across 3 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 human blood and explain the functions of red blood cells, white blood cells, platelets and plasma
A scaffolded answer to the N(A)-Level Biology outcome on human blood. The four main components, what red and white cells, platelets and plasma do, and how red blood cells are adapted to carry oxygen.
7 min answer →

How does the heart pump blood around the body, and why do we have a double circulation?

Describe the structure of the human heart and the circulatory system, and explain how blood is pumped around the body in a double circulation
A scaffolded answer to the N(A)-Level Biology outcome on the human circulatory system. The structure of the heart, the three types of blood vessel, and how a double circulation carries blood to the lungs and the body.
8 min answer →

How do plants move water and food around without a heart?

Describe how water and mineral salts are transported in the xylem and how food is transported in the phloem, and explain transpiration
A scaffolded answer to the N(A)-Level Biology outcome on transport in plants. The roles of xylem and phloem, the transpiration stream that pulls water up, and the factors that change how fast a plant loses water.
7 min answer →