Edexcel IGCSE Biology 復(fù)習(xí)筆記 2.10.5 Co-ordination Systems in Humans The Human Nervous System & Endocrine System There are?two different control systems?in humans that work together to ...
Edexcel IGCSE Biology 復(fù)習(xí)筆記 2.10.4 The Role of Auxin in Phototropism The Role of Auxin in Phototropism Plants produce?plant growth regulators?(similar to hormones in animals) called?auxin...
Hooke's Law When a force?F?is added to the bottom of a vertical metal wire of length?L, the wire?stretches A material obeys Hooke’s Law if: The extension of the material is directly proporti...
Edexcel IGCSE Biology 復(fù)習(xí)筆記 2.10.3 Response to Stimuli: Plants Response to Stimuli: Plants Plants need to be able to grow in response to certain?stimuli For example, plants need to be abl...
What are logarithms? A logarithm is the inverse of an exponent This is in the formula booklet Your GDC will be able to use this function to solve equations involving exponents Try to get used to ‘r...
What are partial fractions? Partial fractions allow us to simplify rational expressions into the sum of two or more fractions with constant numerators and linear denominators This allows for integr...
What are the laws of indices? Laws of indices (or index laws) allow you to simplify and manipulate expressions involving exponents An exponent is a power that a number (called the base) is raised t...
Standard form?(sometimes called?scientific notation?or?standard index form) gives us a way of writing very big and very small numbers using powers of 10. Standard Form Why use standard form? Some n...
Density Density is the?mass per unit volume?of an object Objects made from low-density materials typically have a lower mass For example, a balloon is less dense than a small bar of lead des...
