Guys,
This is in a nutshell what you have to know about the examination.
[For practical assessment we are doing paper 6]
Biology
be able to describe the pathway taken by water as it passes through a plant as
liquid water into root hairs, across the root into xylem vessels and across the
leaf; as water vapour through stomata.
understand that transpiration reduces pressure at the top of xylem vessels and
so causes water
to move up the xylem.
be able to discuss the effect of temperature, humidity and wind strength on
the rate of transpiration.
know that substances that the plant makes in its leaves, especially sugar, are
transported in phloem tubes.
know that phloem tubes are found near the outer surface of a stem and
understand that damage to the outer surface of a stem or tree trunk may
destroy phloem vessels and kill the plant.
know that systemic pesticides are transported in phloem and explain the
advantages of the use of systemic pesticides over contact pesticide.
Useful Links
Comes......
Chemistry
Fuels and combustion
−
know what is meant by the term fossil fuel.
be able to give examples and uses of solid, liquid and gaseous fuels.
understand that a hydrocarbon is a compound containing hydrogen and carbon
only.
appreciate that hydrocarbon fuels are derived from crude oil (petroleum).
understand burning in terms of the fire triangle (fuel, oxygen, heat) and that
the products of the complete combustion of hydrocarbon fuels are carbon dioxide
and water.
know the balanced equation for the complete combustion of methane.
understand that incomplete combustion of carbon-containing fuels produces
carbon monoxide
and carbon (as black smoke).
understand that bond breaking absorbs energy and that bond making releases it.
understand that in exothermic reactions more energy is released when new
bonds form than is absorbed to break bonds in the reactants.
Useful Links
http://www.bbc.co.uk/schools/gcsebitesize/chemistry/usefulproductsoil/