Understanding Food Chains and Webs: Producers, Consumers, and Decomposers, Slides of Biology

Download Understanding Food Chains and Webs: Producers, Consumers, and Decomposers and more Slides Biology in PDF only on Docsity! eines Alnitat is the normal home living things Docsity.com + + = --- --- ------- ----- ---- FILL IN THE MISSING WORDS Docsity.com An example of a food web can be seen on the next slide. Docsity.com ENERGY LOSS IN FOOD CHAINS AND WEBS 1. The more steps we have in a food chain ,the the less energy is used for growth.Most of the energy is used for movement and to keep things warm. 2. The further up a food chain we go,the less animals there are. 3. Food webs are all the chains in a habitat put together. 4. Food webs allow us to study environmental changes. Docsity.com 1. Some food webs can change for short periods e.g. when there is a shortage of rain ,a river bed may dry up but the plant and animal life will survive. 2. When conditions are changed permanently, some animals can be lost forever.They are said to be extinct. 3. Animals adapt to their environments, e.g. worms like dark damp conditions.Try to think of other examples. 4. Food webs can be changed in several ways. Docsity.com 1. Compost heaps are used by gardeners to fertilize the soil. 2. They use waste products from both home and garden to do this. 3, The organic waste contains HUMUS which helps to hold water. 4. A food web exists inside the compost consisting of decomposers, producers and consumers. Docsity.com DECOMPOSERS, PRODUCERS AND CONSUMERS 1. Decomposers break down recyclable materials. 2. Producers trap the sun`s energy and turn it into food. 3. Consumers feed on producers or other consumers. producers consumers consumers decomposers Docsity.com The next slide shows the procedure for making compost. Docsity.com Humidity :- Mosses are simple plants which do not have the ability to absorb water.They are found in damp places. Docsity.com Light intensity :- this is the amount of light in the environment. It is measured with a light meter similar to that used with a camera. Docsity.com Ph :- This is a measure of the acidity of the soil.It is measured with Ph paper.Acid turns pH paper red .The soil in high rainfall areas tends to be acidic.Plants like rhododendrons and azaleas grow in this type of soil. Docsity.com Wind flow rate :- this tells about how fast the wind is flowing in a particular area.It is measured with a wind speed gauge.Some trees become windswept and indeed in windy conditions,some trees will not grow at all. Docsity.com Within each habitat , we find populations of different living things. A population is the number of a particular species in a certain area. For example we may have a local magpie population. Climate affects populations , for example the Osprey shown below migrate to Africa in the winter to return to breed in the spring. Docsity.com POPULATION CHANGE FACTORS AFFECTING CHANGE • 1. Predators during the 1970`s huge numbers of ladybirds appeared. • 2. This was because of a large greenfly population increase. • 3. This made more food available for the ladybirds which grew in number. Docsity.com FACTORS AFFECTING POPULATION CHANGE • Migration • Birds flying south Africa can cause a seasonal change in population. Docsity.com FACTORS AFFECTING POPULATION CHANGE • Climate change. • Changes in weather can cause change in population. • Dinosaurs may have disappeared due to this type of change. Docsity.com FACTORS AFFECTING CHANGE • Floods and Famine. • Both of these can change where people and animals will change their places of life. • Katrina Docsity.com