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Unit 2: Biodiversity and Physiology of Body Systems

5 dot points across 5 inquiry questions. Click any dot point for a focused answer with worked past exam questions where available.

How are gas exchange surfaces adapted in different organisms?

The features of efficient gas exchange surfaces, and gas exchange in humans, fish, insects and plants.
A focused answer to WJEC A-Level Biology Unit 2, covering the features of an efficient gas exchange surface and the adaptations of the human lungs, fish gills, insect tracheal system and plant leaves.
11 min answer →

How do organisms obtain and process their food?

Modes of nutrition, the human digestive system and digestion of food, absorption, and adaptations for different diets.
A focused answer to WJEC A-Level Biology Unit 2, covering autotrophic and heterotrophic nutrition, the human gut and digestive enzymes, absorption at the ileum, and the dental and gut adaptations of herbivores and carnivores.
11 min answer →

How are substances transported around animals and plants?

The mammalian circulatory system and heart, oxygen transport by haemoglobin, and transport of water and assimilates in plants.
A focused answer to WJEC A-Level Biology Unit 2, covering the mammalian heart and circulatory system, the cardiac cycle, oxygen transport and the oxygen dissociation curve, and water and assimilate transport in plants.
11 min answer →

How do we classify living organisms and measure biodiversity?

The principles of classification and phylogeny, the three domains and five kingdoms, biodiversity, and how to measure species diversity.
A focused answer to WJEC A-Level Biology Unit 2, covering the hierarchy of classification, the binomial system, the three domains and five kingdoms, phylogeny, biodiversity and the index of diversity.
11 min answer →

How do pathogens cause disease, and how do we defend against them?

Pathogens and the global impact of infectious disease, the immune response, antibiotics and antibiotic resistance.
A focused answer to WJEC A-Level Biology Unit 2, covering pathogens and the global impact of infectious disease, the non-specific and specific immune responses, antibiotics, and the spread of antibiotic resistance.
11 min answer →