Question

Very long answer type questions
26) 'Manufacturing synthetic fibres is actually helping conservation of forests' Comment
27) Give reason
(a) Teflon is used to make non stick cookwares
(b) Uniforms of firemen have coating of melamine.
(c) Electrical wires have plastic covering, and handles of screw drivers are made of
plastic.
(d) Synthetic fibres are more popular than natural fibres.
(e) Nylon is used for making parachutes and ropes for rock climbing
28) Explain Nitrogen cycle using a suitable diagram.
29) Write a short paragraph on harmful effects of microorganisms.
30) Cultivation of crops involves several activities undertaken by farmers over a period of
time. List out these agricultural practices and give a brief account each one.

I will mark as brainlist if you give the correct answer of these questions of class 8th science​

Answer 1

Explanation:

26 ) Yes manufacturing synthetic fibers conserve biodiversity because, to have cotton clothes and jute bags, silk fabrics, wool, we are plucking the lives of many plants and animals.. If we are using synthetic fibres rather it reduces the amount of poaching of animals and plucking if plants. Thus it actually helps biodiversity..

a) Teflon is used for making non stick utensils because it forms a layer that prevents oil and other such kind substances to not be there.

c) It's so because plastics are bad Insulators and conductors and doesn't allow current or heat to pass through it.

d) synthetic fibres are more popular because it is easy to maintain , dries quickly and washes quickly too ,many colours can be added to synthetic fibres and their elastic in nature and they don't depend upon agricultural crops and animal husbandry for fibres of synthetic fibres, and their really cheaper than natural fibres, they are strong, durable and so.. on...

e) nylon is used for making parachute and ropes for rock climbing because activies like these need a greater support so nylon being much stronger ( stronger than metal wire) is used.

28 ) Nitrogen in the atmosphere can't be used in the original form by plants and animals so, a bacterium named RHIZOBIUM ( nitrogen fixing bacteria) helps nitrogen in the atmosphere to be nitrogen compounds and which plants can use them . The process of convertion of nitrogen in the atmosphere to nitrogen compounds is called nitrogen fixation.

1. Plants use up these compounds and convert them to proteins ,animals eating these plants convert the fixed nitrogen to proteins and amino acids, after the decomposition of these animals and plants decomposers act on them and convert the proteins and amino acids to nitrogen and add back to soil, then the soil bacterium converts the nitrogen compounds to nitrogen and send back to the atmosphere. This is the continuous chain of processes taking place in fixing the nitrogen and sending it back called the nitrogen cycle.

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