Science form 2 power point


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Science form 2 power point

  1. 1. SCIENCE Form 2
  2. 2. SKINSkin holds everything together. It also: protects our bodies helps keep our bodies at just the right temperature allows us to have the sense of touchDont Miss Your Epidermis The skin is made up of three layers, each with itsown important parts. The layer on theoutside is called the epidermis (say: eh-pih-dur-mis). The epidermis is the part of your skin you can see.
  3. 3. PHOTOSYNTHESIS Green plants are producers. This means that they can survive without animals! They can make lots of organic chemicals from a few simple inorganic chemicals. They need simple things like carbon dioxide and water and can make complex things like sugar, starch, fat, and proteins. Plants get their nutrients from the environment. Carbondioxide comes from the air (unless they are aquatic plants,in which case they get it from the water surrounding them). They get water from the soil. They also need otherinorganic nutrients like nitrate, sulphate and phosphate. Afew plants cannot get nitrate out of the soil so they have to eat animals to get the nitrogen which they must have for growth.
  4. 4. FOOD PYRAMIDSymbols, such as a pyramid, illustrate howthe pieces of a healthy diet fit together. Thebase of the pyramid is typically made up of foods that should be the bulk of yourhealthy diet. In contrast, foods you shouldeat in smaller amounts or less frequently are shown in the smaller sections of thepyramid. The same principle applies to thedinner plate — half of the plate consists of fruits and vegetables, which should be the bulk of your diet.
  5. 5. SKELETONS Hydrostatic Skeletons: - consists of fluid held under pressure in a closed body compartment- main type of skeleton in most Cnidarians, Flatworms, Nematodes and Annelids - can control their form and movement by changing the shape of the fluid filledcompartments with muscles in the body wall - offer no protection of support for large land animals
  6. 6. GRAVITATIONAL FORCE What is the Gravitational Force?This is NOT a force of CONTACT.Any object on the Earth or at least close to Earth, will experience a gravitational force. For example, when one shoots a basketball, theforce of gravity acts to pull the ball back to the floor.
  7. 7. AIR PRESSURE Air pressure is the force exerted onyou by the weight of tiny particles of air (air molecules). Although airmolecules are invisible, they still have weight and take up space. Since theres a lot of "empty" space between air molecules, air can becompressed to fit in a smaller volume.