Complete B7 revision notes-higher tier

All you need to know for ocr biology P7 with information and questions with answers :) hope it helps and good luck wiith your revision x

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Ocr Biology ­ unit B7
OCR Biology ­ unit B7
The equation for photosynthesis is...
o Carbon dioxide + Water Glucose + Oxygen
o 6CO2 + 6H2O C6H12O6+ 6O2
Chlorophyll is the pigment which makes the leaves green
Chlorophyll picks up the sunlight
Plants make glucose both for respiration and for growth and repair
However, there is not always sun but the plants always need to respire. Therefore
they have to store some of the glucose they make.
The composition points occur when the amount of CO2 produced is equal to the
amount released.
The glucose is stored a starch. This is because starch is insoluble whereas glucose is
soluble. This means starch stays where it's put as it is not affected by osmosis
There are lots 3 factors which affect respiration. These are...
o Sunlight
o Temperature
o Amount of Carbon Dioxide
There are several ways of measuring how fast photosynthesis happens. You could...
o Measure the amount of glucose in the plant, but that's slow and boring
o Measure the amount of oxygen given off by a water plant such as pondweed
Now try the following questions.... (answers at the end of the document)
1. What is the name of the process which produces glucose in a plant?
2. What is the word equation for photosynthesis?
3. How does the plant store the products of photosynthesis?
4. Why can starch be used to store glucose?
5. Why doesn't photosynthesis happen all the time?
6. What is a plant compensation point?
7. Name the three limiting factors of photosynthesis
8. What is the job of chlorophyll?
9. Does respiration happed 24 hours a day?
10. What is the molecular formula for glucose?
Some organisms rely on other organisms to live, get food or for shelter. This is called
There are three different relationships organisms can have. These are...

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Ocr Biology ­ unit B7
o Mutualism where both organisms benefit e.g. sea anemone on the shell of a
o Commensalism where one organism benefits and the other is not affected
e.g. moss on a tree
o Parasitism where one organism gains at the expense of another organism e.g.
a tapeworm
Each organism adapts in a different way to benefit the most from their host
Now try the following questions... (Answers at the bottom of the document)
1.…read more

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Ocr Biology ­ unit B7
Now try the following questions... (Answers at the bottom of the document)
1. What are the symptoms of sickle cell anaemia?
2. Why is the sickle cell allele more common in some parts of the world?
3. Why do people with sickle cell anaemia have a resistance to malaria?
4. How is malaria transmitted?
5. Two people have a child. Both have one sickle cell allele.…read more

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Ocr Biology ­ unit B7
Ligaments connect bone to bone
Sprains occur when you overstretch a ligament, usually at the ankle or knee. They are
normally treated with RICE treatment (Rest Ice Compression Elevation)
Dislocations happen when a bone slips out of the joint, usually in the knee or
shoulder. It has to be put back in place.
Physiotherapists help create rehabilitation programs to aid recovery.
The physiotherapist must know the patients...…read more

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Ocr Biology ­ unit B7
o A
o B
o AB
o O
The three alleles are...
o IA
o IB
o IO
IA and IB are co-dominant.…read more

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Ocr Biology ­ unit B7
2. Parasitism
3. Food, shelter and other things they need to live
Sickle cell anaemia and malaria
1. Tiredness, painful, stiff joints and shortness of breath
2. Because People with the allele have a natural resistance to malaria so they are more
likely to survive and pass the gene onto their children
3. The malaria parasite can't get into the sickle shaped red blood cells
4. By mosquito
5. 25%/0.25/ 1 4
1. For aerobic respiration
2. Aerobic
3.…read more


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