Investigating Environmental Factors That Cause Animal Movement Environmental factors can be abiotic or biotic Abiotic?factors are the?non-living?parts of an environment For example: temperat...
Reflex Arcs There are?three main types?of neurone:?sensory, relay and motor Sensory?neurones carry impulses from?receptors?to the Central Nervous System (CNS?- the brain or spinal cord) Rela...
Edexcel IGCSE Biology 復(fù)習(xí)筆記 2.4.1 Diffusion Diffusion Theory Diffusion is the?movement of molecules?from a region of its?higher?concentration?to a region of its?lower?concentration Molecu...
Edexcel IGCSE Biology 復(fù)習(xí)筆記 2.3.5 Practical: Enzymes & pH Practical: Enzymes & pH Amylase?is an enzyme that digests?starch?(a polysaccharide of glucose)?into maltose?(a disacchari...
Taxis & Kinesis An organism must?find favourable living conditions in order to survive For complex organisms like monkeys and wolves, this seems like an easy process They possess eyes, e...
Edexcel IGCSE Biology 復(fù)習(xí)筆記 2.3.4 Practical: Enzymes & Temperature Practical: Enzymes & Temperature Amylase is an enzyme that digests?starch?(a polysaccharide of glucose)?into mal...
Edexcel IGCSE Biology 復(fù)習(xí)筆記 2.3.3 Enzymes Enzymes as Biological Catalysts Enzymes Enzymes are proteins that act as?biological catalysts?to?speed up?the rate of a chemical reaction?without being ...
Indoleacetic Acid (IAA) Indoleacetic acid (IAA) is a?specific growth factor?found in plants IAA is synthesised in the growing tips of roots and shoots (ie. in the meristems, where cells are ...
Edexcel IGCSE Biology 復(fù)習(xí)筆記 2.3.2 Practical: Food Tests Practical: Food Tests Preparing a sample Before you can carry out any of the food tests described below, you may need to prepare a ...
