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SingaporeBiology

Nutrition 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.

How are digested food molecules taken into the body and put to use?

Describe how the small intestine is adapted for absorption and explain assimilation
A focused answer to the O-Level Biology outcome on absorption and assimilation. How the small intestine is adapted with villi, what each digested product is used for, and the difference between absorption and assimilation.
8 min answer →

How is the leaf built to carry out photosynthesis efficiently?

Relate the structure of a leaf to its function in photosynthesis and gas exchange
A focused answer to the O-Level Biology outcome on leaf structure. The tissues of a leaf from the upper epidermis to the lower epidermis, the role of the stomata and guard cells, and how each feature suits photosynthesis.
8 min answer →

How do green plants make their own food from light?

State the word equation for photosynthesis and explain the conditions needed and the limiting factors
A focused answer to the O-Level Biology outcome on photosynthesis. The word equation, the raw materials and conditions, the role of chlorophyll, and how light, carbon dioxide and temperature act as limiting factors.
8 min answer →

How does the human body break down food into molecules it can use?

Describe the human digestive system and the role of mechanical and chemical digestion
A focused answer to the O-Level Biology outcome on human digestion. The path of food through the gut, the difference between mechanical and chemical digestion, and the main digestive enzymes and what they break down.
8 min answer →