Biology 4BI1/1B May Jun 2021

Edexcel IGCSE Biology (4BI1) Jun 2021

معلم موافق رایگان بودن است.

1. Respiration and Gas Exchange: Measuring oxygen uptake in yeast, role of mitochondria in energy production, impact of different sugar concentrations on respiration rate, and calculation of respiration efficiency.

2. Circulatory System and Heart Function: Identification of major blood vessels, function of the semi-lunar valves, oxygenated vs. deoxygenated blood flow, and the impact of birth defects on heart function.

3. Photosynthesis and Experimental Biology: Investigating the effect of light on starch production, testing for starch presence in leaves, effect of carbon dioxide concentration on photosynthesis rate, and limiting factors in plant growth.

4. Microbiology and Genetic Modification: Use of genetically modified yeast for biofuel production, comparison of ethanol yield between GM and non-GM yeast, role of restriction enzymes, and benefits of recombinant DNA technology.

5. Ecology and Energy Transfer: Pyramid of biomass for pond ecosystems, inefficiency of energy transfer between trophic levels, egestion and heat loss in food chains, and calculations of energy efficiency.

6. Genetics and Inheritance: Family pedigree analysis, dominant vs. recessive allele inheritance, probability of inheriting a genetic condition, impact of sex-linked traits, and hormonal changes in puberty.