Question

9. What are antibiotics ? Write 3 Names antibiotics.
10. How nitrogen is fixed in nature ?​

Answer 1

Q1. ans : medicine that inhibits the growth of or destroys microorganisms.

Penicillins - for example, phenoxymethylpenicillin, flucloxacillin and amoxicillin.

Cephalosporins - for example, cefaclor, cefadroxil and cefalexin.

Tetracyclines - for example, tetracycline, doxycycline and lymecycline.

Q2. ans : Nitrogen is fixed, or combined, in nature as nitric oxide by lightning and ultraviolet rays, but more significant amounts of nitrogen are fixed as ammonia, nitrites, and nitrates by soil microorganisms. ... Within the nodules, the bacteria convert free nitrogen to ammonia, which the host plant utilizes for its development.

Answer 2

Answer:

An antibiotic is a medicine used for destroying bacteria and curing infections.

Three antibiotics are

1.Penicillins

2.Cephalosporins

3.Tetracyclines