5314617
Descrição
FlashCards por Anisha Rai, atualizado more than 1 year ago
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Criado por Anisha Rai
quase 8 anos atrás
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| Questão | Responda |
| What do organisms require to survive and reproduce? | Materials from their surrounding and from the other living organisms there |
| What do plants compete for? | Light Space Water and nutrients from the soil |
| What do animals compete for? | Food Mates Territory |
| Why do organisms have adaptations? | They are features that enable them to survive in the conditions in which they normally live |
| What are extremophiles? | Organisms that live in environments that are very extreme, containing high levels of salt, high temperatures or high pressures |
| What are parasites adapted for? | Living on or inside their hosts |
| Where do fleas live? What are their adaptations? | Amongst the hair of mammals Sharp mouth parts to enable them to suck blood Body is flattened so that the flea is not easily dislodged Hard body that is not damaged when the mammal scratches Long hind legs that enable it to jump from host to host |
| Where do tapeworms live? What are their adaptations? | Inside the intestines of mammals and many other groups of animals Suckers and hooks to fix themselves to the wall of the intestine Body consists of flattened segments whose main function is to produce large numbers of eggs No gut; their flattened shape provides a large surface are for the absorption of soluble food from the host gut A thick outer cuticle protects it from the host's digestive enzymes |
| What are malaria parasites? | Single-celled organisms that cause malaria in humans The organisms has different forms Each form is specialised for living in a different place in the host |
| What are gametocytes? | They infect mosquitoes and reproduce sexually. When the mosquito has sucked blood containing gametocytes, these pass into the salivary glands of the mosquito, where they develop into a new form, the sporozoite |
| What are sporozoites? | They pass on to humans when the mosquito bites, injecting its saliva into blood vessels. The sporozoites travel with the blood to the liver and enter the liver cells. In the liver some of the sporozoites divide and become thousands of merozoites |
| What are merezoites? | They are released from the liver into the blood, where they enter the red blood cells. Some of these turn into schizonts (Some merozoites in the blood cells enter a sexual phase of reproduction and produce female gametocytes, which can be transferred to the mosquito when it bites) |
| What are schizonts? | They burst the red blood cells, releasing more merozoites. This release coincides with the fever attacks seen when a person has malaria |
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