IGCSE Biology

15:02 Topic 1 Characteristics & Classification A car moves. It uses fuel, gives off waste gases, and responds when you turn the wheel. So is a car aliv… 13:41 Topic 2 Cell Structure Zoom in on a leaf, on your skin, on a drop of pond water — and you find the same thing everywhere: cells… 7:44 Topic 3 Movement Into and Out of Cells A cell is surrounded by a membrane, and it must keep trading with the world outside. Oxygen has to get i… 5:26 Topic 4 Biological Molecules Bread, meat, oil, your own muscles — all of them are built from just a handful of chemical elements. And… 5:54 Topic 5 Enzymes Every second, thousands of chemical reactions are running inside you. Left to themselves, almost all of … 7:36 Topic 6 Photosynthesis A plant cannot hunt and it cannot move. So it builds its own food out of almost nothing: a gas from the … 15:52 Topic 7 Human Nutrition The food on your plate is made of molecules far too big to enter your blood. So your body takes it apart… 5:54 Topic 8 Transport in Plants A tall tree lifts water a hundred metres into the air, every day, with no pump and no moving parts. It d… 8:21 Topic 9 Transport in Animals Your heart beats about a hundred thousand times a day, and it has never once stopped to rest. It is not … 6:05 Topic 10 Diseases and Immunity Right now, your body is being tested by microbes — on your skin, in the air you breathe, in the food you… 5:54 Topic 11 Gas Exchange in Humans Your lungs would cover half a tennis court if you spread them flat. They are not one big bag — they are … 5:00 Topic 12 Respiration Here is the single most common mix-up in IGCSE Biology. Respiration is not breathing. Breathing is movin… 4:50 Topic 13 Excretion in Humans Your kidneys filter your entire blood supply about thirty times a day. But here is the clever part: they… 18:13 Topic 14 Coordination and Response Touch something hot and your hand is already moving before you feel the pain. That is one of your two co… 4:37 Topic 15 Drugs and Antibiotics Ask a doctor for antibiotics when you have a cold and they will say no. Not because they are being diffi… 10:42 Topic 16 Reproduction There are only two ways to make a new organism, and they trade off against each other. One is fast, need… 8:11 Topic 17 Inheritance Two brown-eyed parents can have a blue-eyed child. That is not a mistake, and it is not a surprise once … 7:35 Topic 18 Variation and selection In the year eighteen hundred, almost every peppered moth in England was pale. Fifty years later, in the … 8:11 Topic 19 Organisms and their Environment An African savanna. A coral reef. They look nothing alike, but they run on the same rule. Every living t… 7:43 Topic 20 Human influences on ecosystems A farmer spreads fertiliser on a field. Ordinary, useful work. Two kilometres away there is a river, ful… 7:59 Topic 21 Biotechnology and genetic modification Steel tanks, warm and gently stirred. Inside tanks like these, billions of living microbes are working f…