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Course / Category - 7th Foundation NTSE

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Biology / Life Process Nutrition / Parasites

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Parasites

Parasitic plants: A Parasitic plants is one that partially or completely depends on another plants (called host) for nutrition. Parasitic plants develop special roots, which penetrate into the tissues of the host plant. The prepared food is generally absorbed from the root examples: Cuscuta, dodder, and mistletoe. The parasite deprives its host of valuable nutrients. Its leaves are reduced to tiny brown scales. Since it has no chlorophyll, it obtains all of its food from the green plant it grows on. Its stems twines around the host, producing suckers, called haustoria, that invade the host and steal its food. Once the parasitic plant gets attached to the host plant, it loses its root system.

Some plants are total parasite while some are partial parasite. A total parasite fully depends on other plants for their nutrition. For eg. Cuscuta. Examples of total parasite:

Cuscuta (Dodder) : Portion of Parasite attatched to the stem of host. Calcuta is a vine like plant with yellowish stem. It twines around big trees, like banyan tree. Cuscuta gets nutrition from the tree on which it lives. The tree upon which it climbs and lives is called the host. Here, banyan is the host and cuscuta is the parasite. It is also known as Amarbel.

Orobanche ramosa : The young seedling of santalum grows independently upto one year of age. After this, few roots haustoria, which makes contact with roots of neighbouring trees.

Rafflesia: It is also a total parasite growing on the roots of host plant. It lacks chlorophyll and its stem is thread like penetrating the roots of host plant and sucks the food from there. Rafflesia bears the biggest flower in the world. A single flower measures about 50-100 cm and weighs nearly 10 kg. It has smells of rotten meat.

Partial parasite is a parasite that receives a part of its nutrients from host. Examples are :

Mistletoe is another parasite that steals water and minerals from the host tree. However, it also has green leaves. It produces its own food through photosynthesis, using water absorbed from the host tree.

Viscum: a common mistletoe plant bears green leaves. It synthesizes its own food, but receives water and minerals from host plant. It sucks the liquid from the stem of the host plant with the help of haustoria. Visum does not have normal roots.

Sandalwood : This is also an interesting parasite. It commonly grows in jungles of Karnataka, Tamilnadu and Kerala. These are rootless plants growing on roots of host plants.

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Parasites

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