ncerthelpbook.com

Ncert solution class 8 science ch 3 Synthetic Fibres and Plastics. book questions 1 to 5. Q 1.  Explain why some fibres are called synthetic. Answer :  There are some fibers that are made by humans using chemicals. These are called synthetic fibers. These are made up of small units that join together to create long chains. Examples of synthetic fiber are rayon, nylon, polyester, acrylic, etc. Q 2.  Mark the correct answer. rayon is different from synthetic fibres because: Answer :   it is obtained from wood pulp. Q 3. Fill in the blanks:- Answer : (a)  artificial  and  man made (b)  petrochemicals (c)  polymer Q 4.Give example which indicate that nylon fibres are very strong. Answer :  Nylon fibers are very strong. It is used to make ropes to climb the rocks and To create a parachute. Their use shows that the nylon fiber has high tensile strength. Q 5. Explain why plastics container are favoured for storing food. Answer ...

ncert solution of class 8 science ch 2.   These NCERT solutions for science 8 include detailed answers to all questions in Chapter 2 - micro-organisms provided in the NCERT book, Friends and Enemies who are scheduled for Class 8 in schools Are there. book questions 1 to 5. Q 1. Fill in the blanks . Answer : (a)   microscope (b)  nitrogen (c)  yeast (d)  bacteria Q 2. Tick the correct option. Answer: (a) alcohol (b) streptomycin (c) female anopheies mosquito (d) housefly (e) growth if yeast cells (f) fermentation Q 3 .  Match the following column I and II. Answer:            Column I                           column II  (i) Bacteria ------------------ causing cholera (ii) Rhizobium-------------- fixing nitrogen (iii) Lactobaccilus--------- setting of curd (iv) Yeast----------------------- baking of bread (v) A protozoan------------- causing malaria...

Ncert solution class 8 science ch -1 crop production and management. book questions 1 to 5. Q 1.fill in the blanks. Get NCERT solution for Class 8 Science chapter 1. These NCERT solutions for science 8 include detailed answers to all questions in chapter 1 - Crop Production and Management provided in the NCERT Book for Schools in Class 8 is defined. Answer: (a) crop (b) preparation (c) float (d) water and nutrition Q 2 . match the column 'A' and 'B'. Answer :        'A'                          'B' (i) kharif crops------- paddy and maize (ii) rabi crops--------- wheat,gram,pea (iii) chemical fertilisers-- urea and super phosphate (iv) organic manure------- animal excreta,cow dung,urin and plant waste. Q 3.Give two example of each:-( a) kharif crops  (b) rabi crops. Answer :(a)padyy and maize.                (b)wheat and gram. Q 4. Write a paragraph in your ...