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Science B1 Revision (From Specimen & Past Papers)
Fichas del conjunto (19)
- 1What does FSH, LH and Oestrogen do?FSH made in the pituitary gland. This causes the egg to mature.
Oestrogen made in the ovaries. This inhibits the production of FSH and stimulates LH.
LH made in the pituitary gland. Releases the mature egg. - 2Why do apples that have been planted, taste different to their originals?(Remember certain plants use sexual, and some asexual.) This is due to pollination.
Seeds produced by sexual repro.
Mixture of genes because of this. - 3How can plants be cloned?Using Cuttings/Tissue Culture
- 4What are the affects of Malnutrition?Weight Loss
Irregular Period
Reduced resistance to infection
Tiredness/weakness
Deficiency Diseases - 5Why have the lion-fish increased in their new environment?There are no/few predators
Predictors/Prey do not recognise lion fish.
Less Competition - 6What does it mean if you are malnourished?You don't have a balanced diet.
- 7When the plant tipped on its side, the auxin in the plan is "..." which is why it bends upward.Redistributed
- 8The unbalanced amount of auxin in the plant causes the stem to...Grow Upwards
- 9Explain one way in which goosegrass is adapted to live alongside hedges.long stems
therefore the plant is a better
competitor for light or therefore
the plant grows higher than other
plants to gain light
or
wide spread roots (1)
therefore the plant is a better
competitor for water or therefore
the plant is able to collect water
from a larger area (1) - 10Why are viruses so hard to treat?Because they live inside cells.
- 11A vaccine contains a ... form of the virus.Inactive
(dead or weekend may also be accepted.) - 12What do you do when analysing data trends? For Example: Use the data in the graph support the view that there is no link between MMR vaccination and autism.1. Compare the 2
2. Give Statistics (Figures)
3. Brief Conclusion - 13What ways do different species loose their energy from?1. Respiration releases energy/ Energy from respiration is transferred by heating the surroundings.
2. Some energy lost in animals / named animals waste materials
3. Some energy used in maintenance / repair.
4. Some energy used for movement
5.Energy lost as heat to surroundings
6. Some organisms die - 14Why is it good to keep animals disease free?1.It is good for the economy (farming industry.)
2. Healthy animals use less energy than unhealthy ones. - 15Why sometimes is it better for data to be displayed as a Bar Chart than a Line Graph? (Reference to Q1. There is inefficient data for a line graph.
- 16What happens in a reflex reaction. (Using a Hot Pan)1. Someone touches the hot pan (The Stimulus.)
2. The receptor cells in the skin pick the signal up.
3. A electrical impulse is sent down the sensory neuron and into the central nervous system.
4. The impulse then has to cross a synapse, it does this by turning into a chemical and diffusing across it.
5. The impulse then crosses another synapse to the reflex neuron.
6. The signal then travels to the effector muscle, which contracts and causes the hand to lift up immediately, before the brain even doing anything. - 17The fusion of the body cell from the male sheep and the egg from the female sheep is an example of asexual reproduction. Explain why1. There was no mixing of genes /
genetic material
2. Because the nucleus was
removed from the egg cell before
fusion - 18Why was Darwin's Theory not widely accepted?1. There was strong religious belief at the time, and this went against the fact that God created the world.
2. There was not sufficient evidence at that time. - 19Explain Natural Selection1. Organisms within species may
show variation.
2. Because mutation(s) occur in
individuals
3. This results in the individuals with
characteristics most suited to the
environment being more likely to
survive / to breed.
4. As a consequence the genes that
have enabled these individuals to
survive are passed on to the next generation.
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- Science Fichas sobre Science B1 Revision (From Specimen & Past Papers), creado por Tom Gill el 29/05/2013.
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- Tom Gill
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