List 2 ways in whichAnswer in brief / detail (Any three)
1) Explain Nitrogen cycle with diagram.
2) What are plastics? Give their types with examples and explain the properties of plastics briefly.
3) What is irrigation? Name the traditional & modern methods and explain the 2 modern methods.
4) What are synthetic fibres ? and explain about any 3 synthetic fibres in short. (write about what they
are made up of, their properties and their uses) plastics affect animals.
Answers
1) Nitrogen Cycle is a biogeochemical process through which nitrogen is converted into many forms, consecutively passing from the atmosphere to the soil to organism and back into the atmosphere. It involves several processes such as nitrogen fixation, nitrification, denitrification, decay and putrefaction.
Answer:
1.. The nitrogen cycle is the biogeochemical cycle by which nitrogen is converted into multiple chemical forms as it circulates among atmosphere, terrestrial, and marine ecosystems. ... Important processes in the nitrogen cycle include fixation, ammonification, nitrification, and denitrification.
2.. Plastic Composition
The composition, structure, and properties of plastics
Properties and applications of commercially important plastics
acrylonitrile-butadiene-styrene (ABS) 15–55 0.9–3.0
polyvinyl chloride, unplasticized (PVC) 40–50 2.1–3.4
polymethyl methacrylate (PMMA) 50–75 2.2–3.2
polytetrafluoroethylene (PTFE) 20–35 0.5
3. sprinkler irrigation method, water is taken from source to the fields through pipes, whereas in surface irrigation methods only 30-45 per cent water reaches the crops. Such loss of water is avoided in sprinkler irrigation method.
4..Synthetic fibres are made only from polymers found in natural gas and the by-products of petroleum. Synthetic fibres are man-made fibres, most of them are prepared from raw material petroleum called petrochemicals. All fabrics are obtained from fibres, while fibres are obtained from artificial or man-made sources.