15. Which of the following microorganisms is used in the production of antibiotics?
Answer: a) Bacteria
Explanation: Many antibiotics are produced by bacteria such as Streptomyces, which is commonly used to produce antibiotics like streptomycin and tetracycline.
16. Who invented the telephone?
a) Thomas Edison
b) Alexander Graham Bell
c) Albert Einstein
d) Nikola Tesla
Answer: b) Alexander Graham Bell
Explanation: Alexander Graham Bell is credited with inventing the first practical telephone and is considered one of the founders of the telecommunications industry.