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An infectious disease transmissible as from person to person by direct contact with an affected individual or the individual's discharges or by indirect means as by a vector compare contagious disease. For example cholera, malaria, chicken pox.
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A symbol which has a fixed numerical value is called a constant.
For example:
2, 5, 0, -3, -7, 2/7, 7/9 etc., are constants.
Number of days in a week represents a constant.
In the expression 5x + 7, the constant term is 7.
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It normally takes about three or four months for a crop to mature. The cutting and gathering of the matured food crop is called harvesting. In large fields,wheat and paddy crops are cut by a motorised machine called harvester. The crops like wheat or rice are cut close to the ground by hand using a cutting tool called sickle.This is called manual harvesting.
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Paramecia are single-celled protists that are naturally found in aquatic habitats. They are typically oblong or slipper-shaped and are covered with short hairy structures called cilia. Certain paramecia are also easily cultured in labs and serve as useful model organisms. Paramecia cells are characteristically elongated.
- Pellicle - a membrane covering that protects the paramecium like skin
- Cilia - hair like appendages that help the paramecium move food into the oral groove
- Oral Groove - collects and directs food into the cell mouth
- Cell Mouth - opening for food
- **** Pore - disposes of waste
- Contractile Vacuole - contracts and forces extra water out of the cell
- Radiating Canals - paths to the contractile vacuole
- Cytoplasm - intercellular fluid needed to contain vital cell parts
- Trichocyst - used for defense
- Gullet - forms food vacuoles
- Food Vacuole - storage pocket for food
- Macronucleus - larger nucleus which performs normal cell functions
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