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With the aid of examples, explain parasitism

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Parasitism in Plants
An example of a parasitic plant is the Dodder (Cuscuta sp.); often found twined round the sterns of clover plants or grasses, which it damages severely: The dodder plant consists of a long slender yellow or pinkish stem, with the leaves reduced to tiny scales, and roots being absent except for a short time after germination. At intervals along the twining stem small root like structures, called haustoria, link the Podder to its host and penetrate to the host's vascular bundles. In this way the parasite obtains Organic nutrients, water and mineral salts directly from the host. The Dodder is not fussy about its host. Any herbaceous plant can be infected. Woody plants are usually too hard for the haustoria to penetrate. If plants are densely packed, dodder will spread rapidly to adjacent plants. It can cause a great deal of damage to wheat or lucerne fields.

Parasitism in Animals
The bilharzia, Schistosoma haematobium, is a parasite flatworm and an example of a Successful parasite. It completes its life cycle in two hosts. The male and female adults live in the blood of humans while larval forms live in 'the bodies of a type of snail, Bulinus africanus. The adult poses suckers with which they attach themselves to the waifs of blood vessels. Their bodies are covered with thick cuticles.
When mature, adults meet in the blood of man. The male and female become 'associated' in fiat the slightly broader male rolls its body into a tube in which the long, thin female lives. When the female is ready to lay eggs she frees herself and moves into small bipod vessels in the wall of the bladder. There she lays eggs.
When the egg comes into contact with the water, its shell breaks and a ciliated larva, called a miracidium, is released. If it comes in contact with a host it works itself into the body of the snail by means of hydrolysis. Sporocysts are produced by the miracidium, Cercariae are produced after several generations of sporocysts. The cercariae make their way into the water arid make contact with a human. There it comes into the blood stream and live their. Within six to twelve weeks the larvae develop into adults and the cycle is reported once more.

francis1897 answered the question on February 27, 2023 at 13:26

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With the aid of examples, explain parasitism

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