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Diffusion is the movement of molecules from a region of higher concentration to a region of lower concentration. The rate of diffusion is influenced by several factors: Temperature. Surface area. Concentration gradient. Diffusion distance. You can investigate how temperature affects diffusion using beetroot.
A good experimental design must have at least two attributes: (1) Replication at the appropriate biological scale; (2) Factors of interest be free from confounding so their influence can be disentangled from each other and other factors.
The exchange of materials between organisms and their surroundings, and across membranes within and between the cells of an organism are key to all the processes biologists recognise as being part of life.
20 sie 2022 · An experiment is a special type of scientific investigation that is performed under controlled conditions. Like all investigations, an experiment generates evidence to test a hypothesis. But unlike …
The Mass Flow Hypothesis was the model initially used to explain the movement of assimilates in the phloem tissue. The mass flow hypothesis was modelled by Ernst Münch in 1930. His simple model consisted of:
Revision notes on 8.2.2 Practical: Investigating Respiration for the Edexcel GCSE Biology syllabus, written by the Biology experts at Save My Exams.
It is a collection of experiments that demonstrate a wide range of biological concepts and processes. Experiments are placed within real-life contexts, and have links to carefully selected further reading. Each experiment also includes information and guidance for technicians.
