today is my science exam so if anyone can give me extra questions chapters 1 the cell- its structure and functions 2 sources of energy 3 synthetic fibres and plastics please help me
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Answers
Explanation:
Classification systems are used by scientists to help us understand the natural world. When objects are classified, they are simply put into a group with other similar objects. The classification systems used in biology are based on the similarities and differences in organisms.
Answer:
Question 1.
Name a natural fibre.
Answer:
Cotton
Question 2.
Name the basic component of animal fibres.
Answer:
Protein
Question 3.
Name some artificial fibres.
Answer:
Nylon, terylene, PET, acrylic, teflon, etc.
Question 4.
Which fibre is known as artificial silk?
Answer:
Rayon
Question 5.
In which country was rayon first time synthesised?
Answer:
England
Question 6.
Name the first fully synthetic fibre.
Answer:
Nylon
Question 7.
Name the largest producer unit of rayon in the world.
Answer:
Grasim India
Question 8.
Name a common variety of polyester.
Answer:
Terylene
Question 9.
What is ester?
Answer:
Ester is sweet-smelling compound.
Question 10.
Name some objects made of plastics.
Answer:
Containers, buckets, bottles, chairs, baskets, etc.
Question 11.
What is polythene?
Answer:
Polythene is a polymer of ethene.
Question 12.
Give some examples of thermoplastics.
Answer:
Polythene and polyvinyl chloride.
Question 13.
Give some examples of thermosetting plastics.
Answer:
Bakelite and melamine.
Question 14.
What is the full form of PVC?
Answer:
Polyvinyl Chloride
Question 15.
What is 4R’s?
Answer:
4R’s stands for Redue, Reuse, Recycle and Recover.
Question 16.
Whether cotton cloth a biodegradable or non-biodegradable?
Answer:
Biodegradable
Question 17.
Name the form of polyester which is replacing materials like glass and used for making bottles and jars.
Answer:
PET (Polyethylene Terephthalate)
Question 18.
Which of two is thermosetting plastic—PVC or bakelite?
Answer:
Bakelite
Question 19.
Name a synthetic fibre which is polyamide.
Answer:
Nylon
Question 20.
Give the name of a plastic used for making fibres.