Oxygen and carbon dioxide diffuse between blood in capillaries and air in alveoli. Descriptive models are used to explain phenomena. Be able to describe the function of stem cells in embryonic and adult animals and meristems in plants 5.
Be able to describe genetic engineering as a process which involves modifying the genome of an organism to introduce desirable characteristics.
Photosynthesis, importance explained, limiting factors affecting rate Revision Notes 2. Be able to recall that most phenotypic features are the result of multiple genes rather than single gene inheritance. Revision summary Chapter B4.
From your Key Stage 3 Science, learners will be familiar with the reactants and products of photosynthesis, and the need for light in the process.
How can we treat disease? HT only Light intensity is inversely proportional to the square of the distance from the light source the inverse square law ; this helps us explain why the rate of photosynthesis changes in the way that it does with distance from a point light source.
Be able to explain how water and mineral ions are taken up by plants, relating the structure of the root hair cells to their function 5. For example, the spread of antibiotic resistance in bacteria can be explained by mutation, advantage and natural selection.
The human body — staying alive this page Revision summary Chapter B5. Such interactions can result in ecosystems being damaged or destroyed, populations dying out, and species becoming extinct when conditions change more quickly than they can adapt.
A different version of a gene is a genetic variant. A change in the size of a population will affect other populations in the same community.
Some of the glucose is used as the fuel for cellular respiration, some is converted into starch and then stored, and the rest is combined with elements absorbed from the environment to make carbohydrates, lipids and proteins biomass for growth.
These small molecules are used to make larger organic molecules, such as long-chain carbohydrates, lipids and proteins. Be able to describe how to carry out a field investigation into the distribution and abundance of organisms in an ecosystem and explain how to determine their numbers in a given area 3.
Be able to explain the use of vaccines in the prevention of disease, including the use of safe forms of pathogens and the need to vaccinate a large proportion of the population Chapter Topic B2.
Gene technology could help us provide for the needs of society, by improving healthcare and producing enough food for the growing population.
Clinical testing uses healthy human volunteers to test for safety, and humans with the disease to test for safety and effectiveness. The transfer of biomass between organisms is one way in which the populations in a community are interdependent, and can be modelled using a food web IaS3.
Be able to explain the terms chromosome, gene, allele, variant, genotype and phenotype. IaS4 How do science and technology impact society? Ear Skin Tongue A company makes fishing lines. You will expand your knowledge of the interdependencies between organisms within ecosystems in Topic B3.
However, most characteristics depend on the instructions in multiple genes and other parts of the genome. A zygote divides by mitosis to form an embryo.
The larger molecules are used to build new structures e. These include the skin and mucus, stomach acid, saliva, tears, and bacteria in the gut. Practical work - investigating mitosis using a microscope to look at stained cells from onion root tip 2. Be able to explain the terms gamete, homozygous, heterozygous, dominant and recessive.Get access too all of the OCR GCSE Science past papers and mark schemes including the specimen papers for the new OCR GCSE Science course.
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