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Download 5.4 Rhododendrons competition - science
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Transcript
Animals compete for; •Water •Territory •Mates •Food Plants compete for; •Water •LIGHT COMPETITION AMONGST ORGANISMS •MINERALS ANIMALS WHICH ANIMALS COMPETE WITH THEIR OWN/ OTHER SPECIES? COMPETITION AMONGST animals SOME COMPETE WITH THEIR OWN SPECIES FOR FOOD/MATES. When animals eat a variety of food then they have a better chance of surviving as they are more adaptable. Take the koala. It only eats eucalyptus leaves! So if they go there is no food! Silk worms They only live in eucalypt trees so when they are cut down! There is a disease that wipes out communities! This is the case with silk worms and panda’s. Panda bears Take the peacock. The spectacular display of a male peacock attracts the attention of the female. Whilst MANY other male animals will fight to compete for a mate, the peacock will not fight risking harm. They will display their plume. Overcrowding (competition for space – water, minerals) can lead to overall reduction in growth when compared to plants not overcrowded Plants compete for; •Water •LIGHT •MINERALS Coping with competition Some plants flower, set/release seeds and die back very early before the rest of the trees grow their leaves back. Why? bluebells anemones snowdrops dandelion seeds can float on wind currents. Others produce fruit light enough to float. Eg sycamore. Why? Coconut seeds can float for weeks/months. They travel far from the parent plant. Others tempt animals to eat them or attach to them as they run pass. Why? Competition in plants B1b 5.5 Why are rhododendrons a problem? Successful plants; •Get their roots into the soil first to get the most available water and minerals •Open their leaves faster to photosynthesise with all available light Rhododendrons have reached BeddGelert! This beautiful Welsh valley is popular with climbers, walkers and families out for a day in the countryside. (BeddGelert also has Snowdonia’s best ice cream shop!). Rhododendrons are not native plants in the UK but they are particularly well adapted to harvest light for photosynthesis. This makes them very successful - and that’s the problem. Click here to play video By clearing the rhododendrons, the seedlings of the woodland trees get a chance to grow and the natural beauty of the valley can be conserved for generations to come. Mark each of these true or false. Click on answers to see how many you got right. 1 2 3 4 5 Rhododendrons are adapted to cope with low light conditions - down to about 4% of a normal sunny day! Rhododendrons are cut down because sheep eat them and the leaves are poisonous. Conservationists never destroy part of the living environment. Photosynthesis produces oxygen. Rhododendrons can smother fully grown trees. 1 2 3 4 5 Rhododendrons are adapted to cope with low light conditions down to about 4% of a normal sunny day! TRUE, this is what makes the rhododendron such a good competitor Rhododendrons are cut down because sheep eat them and the leaves are poisonous. FALSE, the leaves are not particularly poisonous (though the BeddGelert ice cream tastes better!) and sheep don’t really eat them! Conservationists never destroy part of the living environment. FALSE, conservationists often cut back one species to promote a wider range of species overall. Photosynthesis produces oxygen. TRUE, it uses up carbon dioxide and water to make sugar and oxygen. Rhododendrons can smother fully grown trees. FALSE, rhododendrons do damage to growing seedlings by blocking the light they need to grow. Fully grown trees have leaves that are borne above the rhododendron canopy. Use page 91 of your text and answer question c in your workbook