71.
One day you wake with a sore throat and a runny nose. Your doctor takes a swab from your throat, sends it to a lab, and telephones you the next day to say that antibiotic will not help you get better. Which of the following is the most likely reason for the doctor's statement?

72.
Plants that grow under average temperature and moisture are called:

73.
Oxyreductases, transferases, hydrolases, lyases, isomerases and ligases are all classes of

74.
Mutation is

75.
Pollination by wind is called

77.
Nitrogen is fixed in ecosystems in ways stated below. Which one of the statements below is false?

78.
Ptyalin is an enzyme produced in the

79.
Mycobacterium leprae causes leprosy, Corynebacterium diphtheria causes diphtheria and Vibrio comma causes

80.
Biotic component of the environment does not include-

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