ADH and osmoregulation
A slide show and test on the role of ADH in osmoregulation
Link to website with good AS and A2 resources
A nice introduction to the carbon cycle
00.00 Carbon in the ecosystem
This section begins by introducing the element carbon as a finite resource. Carbon is present in the atmosphere, living things and soil.
00.38 Uptake of CO2 from the atmosphere
Radioactive carbon dioxide is used to measure and trace the uptake of CO2. The equation for photosynthesis is given with 14C.
02.23 The return of CO2 to the atmosphere
Carbon passes into animals in food, and is returned to the air through respiration. The change in CO2 level in air is shown with bicarbonate indicator, demonstrating that living things give off this gas.
Nutrients including carbon return to the soil during the breakdown of dead remains by decay organisms. Carbon is also returned to the air when fossil fuels are burned.
Includes lungs and circulation
Designed for A level revision with learning objectives from an out of date syllabus
Circulatory System Overview
An overview of the circulatory system, blood and blood vessels
Core Practical Potato Chips
The classic potato chips experiment. Add cubes of potato, of very similar dry mass and size, to glucose solutions of different concentration. Leave for some time, remove and dry. Measure the change in mass.
Heart structure and function
Test on the parts of the heart and reviews the cardiac cycle
Human Evolution (made easy)
An excellent introduction to human evolution
Short animated clip for mitosis
An overview of photosynthesis for A level
Plant growth under coloured lights
Photographs of experiments (designed by students) to look at the effect of light colour on the angle of plant growth. Data from these experiments.
Practical Enzyme rate vs substrate concentration
A visual demonstration of the impact of substrate concentration on enzyme activity. Rates are demonstrated using different concentrations of hydrogen peroxide added to yeast and soap.
Practical pH and enzyme activity
Using yeast kept in different pH buffers, another very visual demonstration of the effect of pH on enzyme activity.
Practical Temperature and enzyme activity
Again, another visual demonstration of the effect of temperature (using a number of water baths) on enzyme activity
Revision Reproductive cells
Short revision clip. Reproductive cells
Revision Sex chromosomes
Short revision clip. Sex Chromosomes
Theory of Evolution (made easy)
Excellent introduction to Darwin's theory of evolution
Transport and support in plants
An overview of the main transport and support structures in plants
Xylem and Phloem
The structure and function of the xylem and phloem