Key term
OCR GCSE Biology A J247
Cell Level Systems
Topic overviewMicroscopy, and sub-cellular structuresDNA structure: polymer, double helix and nucleotidesProtein synthesis and the triplet codeEnzyme action, and investigating enzymesCellular respiration as an exothermic processAerobic and anaerobic respiration comparedSynthesis and breakdown of carbohydrates, proteins and lipidsPhotosynthesis: producers and the processPhotosynthesis as endothermic, and investigating itLimiting factors in photosynthesis
Community Level Systems
Genes, Inheritance and Selection
Topic overviewGenetic terms, and the genomeGenome, environment and mutationsHow genetic variants influence phenotypeAsexual and sexual reproduction comparedHaploid, diploid and meiosisSingle gene inheritance and Punnett squaresSex determination, multiple genes and Mendel's workVariation within a population, and classificationNatural selection and evolutionEvidence for evolution, and the work of Darwin and Wallace
Global Challenges
Topic overviewField investigations, and human impact on ecosystemsMaintaining biodiversity, and evidence for environmental changeFood security, agricultural and biotechnological solutionsSelective breeding and genetic engineeringHealth, disease, and types of diseaseInteractions between diseases, and how they spreadReducing the spread of disease, and named examplesPhysical and chemical plant defencesDetecting plant disease; white blood cells and plateletsNon-specific defences and the immune systemMonoclonal antibodies and their usesVaccines, medicines and aseptic techniqueDeveloping new medicines, and non-communicable diseaseTreating cardiovascular disease, and lifestyle factorsCancer, and the use of stem cells in medicineGene technology in medicine, and the human genome
Organism Level Systems
Topic overviewThe nervous system and coordinated responsesThe reflex arcThe eye and its common defectsThe structure and function of the brainInvestigating and treating the brainHormonal coordination, thyroxine and adrenalineHormones in reproduction and the menstrual cycleContraception and treating infertilityPlant hormones and their commercial usesHomeostasis, and the skin in temperature controlInsulin and glucagon in blood sugar controlType 1 and type 2 diabetesOsmotic changes in body fluids, and the kidneysThe kidney tubule and the effect of ADHResponding to temperature and osmotic challenges
Scaling Up
Topic overviewDiffusion, osmosis and active transportMitosis, the cell cycle and cell differentiationStem cells in animals and meristems in plantsSurface area to volume ratio and exchange surfacesThe circulatory system, the heart and blood vesselsRed blood cells and plasmaRoot hair cells, transpiration and translocationXylem and phloemFactors affecting water uptake, and the potometer
Cell Level Systems
Photosynthesis as endothermic, and investigating it
- 3 things to know
- Paper 3
Overview
Endothermic reactions and where the energy in photosynthesis ends up, how it compares with respiration, measuring the rate in pondweed with a lamp, and testing a leaf for starch to show light is needed.
What you need to know
Answer each one before you reveal it.
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Key term
Where does the energy taken in during photosynthesis end up?
Key term
How do photosynthesis and respiration differ in the way they handle energy?
Questions from this subtopic
Each one with the model answer underneath.
- 1
What is an endothermic reaction?
Model answer
A reaction that takes in energy from its surroundings.
- 2
Why is photosynthesis described as endothermic?
Model answer
It takes in light energy from the surroundings in order to take place.
- 3
Where does the energy taken in during photosynthesis end up?
Model answer
Stored in the chemical bonds of the glucose that is made.
- 4
How do photosynthesis and respiration differ in the way they handle energy?
Model answer
Photosynthesis takes energy in from the surroundings, while respiration releases energy to them.
- 5
What happens to photosynthesis in complete darkness, and why?
Model answer
It stops, because there is no light energy for the reaction to take in.
- 6
Why does a plant kept in the dark still respire?
Model answer
Respiration goes on continuously in all living cells and does not need light.
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