This topic explores the definition of health and the distinction between communicable and non-communicable diseases, including the role of pathogens. It covers human and plant defence mechanisms, the development of medicines, and the impact of lifestyle factors on non-communicable diseases.
Topic 6 – Plant structures and their functions explores how plants are adapted to obtain resources, transport them, and respond to their environment. You'll study the structure of leaves, roots, and stems, and how these organs work together to support photosynthesis, gas exchange, and water transport. This topic also covers the mechanisms of transpiration and translocation, as well as plant hormones and their role in growth responses. Understanding these processes is essential for explaining how plants survive and thrive in diverse habitats.
This topic builds on your knowledge of cells and photosynthesis from earlier in the course. It connects to ecology (how plants interact with their environment) and to practical skills like using a potometer to measure transpiration rates. Mastering this content will help you answer questions about adaptations, transport systems, and plant responses – all of which are common in exams. It also provides a foundation for A-level Biology, where you'll explore these processes in greater depth.
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