Guys can you please help me for about these questions objective ( Q1 to 18 )

Dear student,
Please find below the answer:

1. The correct option is (iii). Yeast (Saccharomyces cerevisiae) causes fermentation and is useful in making alcoholic beverages.
2. The correct option is (iii). The bacteria with bacilli in their name are rod-shaped bacteria. 
4. The correct option is (ii). Vaccines contained a weakened or killed form of antigen, in response to which antibodies are produced.
5. The correct option is (iv). Polyvinyl chloride or PVC is used to make water pipes.
6. The correct option is (ii). Most of the plastics are made from crude oil.
7. The correct option is (i). Rayon is a man-made fiber prepared from a natural raw material known as cellulose which is obtained from wood pulp.
8. The correct option is (iv). Both platinum and silver are used to make jewelry because they are the least reactive metals with a high amount of luster and ductility.
9. The correct option is (i). Metals react with oxygen to form metal oxides which are basic in nature. 

Please post rest of the questions in a separate thread.
Regards.
 

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