Checklist for B7

A list for the OCR B7 exam

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B7.1 Living organisms are interdependent.
1. understand that all organisms are ultimately dependent on energy from
the Sun;
2. recall that plants absorb a small percentage of this energy for the
process of photosynthesis;
3. recall that this energy is stored in the chemicals which make up the
plants' cells;
4. distinguish between autotrophs and heterotrophs in an ecosystem;
5. explain how energy is transferred between organisms in an ecosystem:
a. when organisms are eaten;
b. when dead organisms and waste materials are fed on by decay
6. draw and interpret pyramids of number and biomass to illustrate feeding
relationships in a food chain;
7. explain the advantages of using each type of pyramid;
8. explain how energy passes out of a food chain at each stage via heat,
waste products and uneaten parts, limiting the length of food chains;
9. calculate from given data the percentage efficiency of energy transfer at
different stages of a food chain;
10. recall that soil is composed of:
a. biomass (living organisms and decaying material);
b. inorganic material;
c. air;
d. water (with dissolved mineral ions);
11. calculate percentage water and biomass in soil samples (IaS1.4, 1.5,

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B7.2 Photosynthesis.
1. recall the equation for photosynthesis:
light energy
carbon dioxide + water Æ glucose + oxygen
2. recall the main stages of photosynthesis:
a. light energy absorbed by the green chemical chlorophyll;
b. energy used to rearrange the atoms of carbon dioxide and water to
produce glucose (a sugar);
c. oxygen produced as a waste product;
3. recall that this glucose may be:
a. converted into chemicals needed for growth of plant cells, for
example, cellulose, protein, chlorophyll;
b.…read more

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IaS1.1, 1.2, 1.3);
11. understand that most scientists agree that human activity is causing an
increased level of atmospheric carbon dioxide.
B7.3 Heterotrophic nutrition
1. recognise examples of symbiosis and commensalism;
2. recall parasitism as a close association between two organisms of
different species which is beneficial to one (the parasite) and harmful to
the other (the host);
3. recall two parasites and explain how specific features enable them to be
4. understand the importance of parasites:
a.…read more

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DNA chromosome;
d. DNA plasmid;
2. recall that bacteria and fungi can be grown on a large scale
(fermentation) to include:
a. production of antibiotics;
b. production of single-cell protein;
c. enzymes for food manufacture, for example, rennin;
3. recall the main steps in genetic modification as:
a. isolating and replicating the required gene;
b. transferring the gene into a new cell;
c. use of a vector (virus or plasmid);
4. recall that genetic modification includes:
a.…read more

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Æ carbon dioxide + water (+ energy released)
4. understand that energy released during respiration is used to
synthesise a chemical called ATP;
5. understand that ATP can be referred to as the "energy currency" of
living things;
6. recall that muscle tissue contracts when provided with energy (ATP) from
7. recall that during exercise, respiration in muscle cells increases to
provide additional energy for movement;
8.…read more

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­ transporting oxygen;
b. white blood cells ­ fighting infection;
c. platelets ­ blood clotting at injury sites;
2. recall that the ABO blood type system describes:
a. antigens on the surface of red blood cells;
b. antibodies in blood plasma;
3. understand that, for blood transfusions, the donor and recipient must be
matched to avoid clotting;
4. interpret compatibility data for the ABO system;
5. recall that ABO blood type is determined by a single gene with three
alleles, A, B and O;
6.…read more

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