Triple

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Author:
ghoran
ID:
151140
Filename:
Triple
Updated:
2012-04-30 13:08:25
Tags:
wrongly answered questions from past papers
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GJH
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  1. how is crude oil seperated into different fractions
    • the crude oil is heated to vapourise the mixture
    • the oil then cools and condenses at its boiling point
    • different fractions have different boiling points , so condense at different temperatures so can be collected seperately
  2. Joshua trees live in deserts . Joshua trees have two types of root . they have a system of shallow roots spread out over a large area and they have roots about 1 m in diameter , shaped like bulbs deep in the soil explain the advantage of a Joshua tree having
    shallow roots spread out over a large area
    it will be able to get watwe from a large area after rain
  3. Joshua trees live in deserts . Joshua trees have two types of root . they have a system of shallow roots spread out over a large area and they have roots about 1 m in diameter , shaped like bulbs deep in the soil explain the advantage of a Joshua tree having
    large , bulb like roots deep in the soil
    it will stabalize the plant in thr ground
  4. creosote bushes also live in deserts the leaves of creosote bushes are covered with a layer of wax and fold together during the day
    explain how the leaves of the creosote bush help it to survive in deserts
    they reduce water loss , the wax will refelect heat and the folding reduces the surface area
  5. name two hormones used in IVF
    • FSH
    • LH
  6. describe IVF
    FSH and LH are given to the woman before egg collection to stimulate egg production ggs are collected from the womens ovaries and fertilised in a lab using the males sperm . These are the grown into embryos, once the embryo's are tiny balls of cells , one or two of them are then inserted into the womens uterus to improve the chance of pregnancy
  7. what are the pros and cons of IVF
    • pros = fertility treatment can give an infertile couple a child
    • Cons = some women have a strong reaction to the hormones (abdominal pain , vomiting , dehydration)
    • Cons = there have been som reports of an increase risk of cancer due to the hormone treatment
    • Cons = multiple births can happen if more than one embryo grows into a baby - these are risky for the mother and baby (there's a higher risk of miscarrage , stillbirth)
  8. give one advantage in any research project , of having a large sample size rather than a small sample size
    there is enough data to indicate relationships
  9. explain how teh spectrum shift of the dark line supports that theory that the universe bgan from a small initial point
    • the light has been shifted to the red end of the spectrum
    • the wavelength increases
    • suggesting that galaxies are moving away from each other
    • suggesting the universe is expanding outwards from a single point
  10. why does a liwuid cool down when it evapourates
    • there are attractive forces between molecules
    • only the fastest molecules have enough energy to break away from the other molecules
    • the molecules escape from the surface of the liquid
    • the average speed of the molecules decreases
    • the lower the average speed of the molecules the lower the energy and the lower the temperature of the liquid

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