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Answer:
1). Winnowing is an agricultural method developed by ancient cultures for separating grain from chaff. It can also be used to remove pests from stored grain. Winnowing usually follows threshing in grain preparation.
2). Polycot is obtained by mixing polyester and cotton. Polycot is popular polyester used in textile manufacturing units. Polyesters are formed as a result of condensation of dicarboxylic acids and diols.
3). When an acid reacts with metal, a salt and hydrogen are produced: acid + metal → salt + hydrogen An example: nitric acid + calcium → calcium nitrate + hydrogen The salt that is produced depends upon which acid and which metal react.
4). The substances which burn in air are called combustible. Oxygen (in air) is essential for combustion. During the process of combustion, heat and light are given out. Ignition temperature is the lowest temperature at which a combustible substance catches fire.
5)The nuclear pore is a protein-lined channel in the nuclear envelope that
regulates the transportation of molecules between the nucleus and the cytoplasm. In eukaryotic cells, the nucleus is separated from the cytoplasm and surrounded by a nuclear envelope.
SHORT WAY -
winnowing
polyester
hydrogen
combustion
cytoplasm
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