9C Class Blog

 

  The mass of an object is the amount of matter it is made of. Mass is measured in kilograms. Density is a property of material. It tells us how concentrated its mass.

  Reproduction means producing new living organisms. Animals and plants reproduce to make new individuals of the same species. There are two types of reproduction: asexual and sexual reproduction. View complete notes on the topic "Reproduction" from the PDF file below.

  The blood, pumped by the heart, travels all around the body in blood vessels. It leaves the heart in arteries and returns in veins. Valves, present in the heart and veins, ensure a one-way flow for the blood. As blood enters an organ, the arteries divide into smaller arterioles, which supply capillaries. In these vessels the blood moves much more slowly, allowing the exchange of materials such as oxygen and glucose, carbon dioxide, and other wastes. Blood leaving an organ is collected in venules, which transfer it on to larger veins. View complete notes on the topic "Transport in animals" from the PDF file below.

The CELL is the smallest unit of life that can carry on all the processes of life. Cells contain a variety of internal structures called organelles. An organelle is a cell component that performs specific functions for the cell. All living cells arise from pre-existing cells by division. View complete notes on the topic "Organisation of the organism" from the below PDF file.