Identify the microbes producing commercially important organic acids and enzymes from the given options:
(A) Trichoderma polysporum
(B) Streptococcus
(C) Clostridium butylicum
(D) Aspergillus niger
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → (B), (C) and (D) Only
(A) Trichoderma polysporum — False. It gives cyclosporin A, an immunosuppressant, not an acid or enzyme.
(B) Streptococcus — True. It gives the enzyme streptokinase.
(C) Clostridium butylicum — True. It gives butyric acid.
(D) Aspergillus niger — True. It gives citric acid.
NCERT Extract:
Chemicals, Enzymes and Other Bioactive Molecules – “… Examples of acid producers are Aspergillus niger (a fungus) of citric acid, Acetobacter aceti (a bacterium) of acetic acid; Clostridium butylicum (a bacterium) of butyric acid and Lactobacillus (a bacterium) of lactic acid.”
Chemicals, Enzymes and Other Bioactive Molecules – “… Streptokinase produced by the bacterium Streptococcus and modified by genetic engineering is used as a ‘clot buster’ for removing clots from the blood vessels of patients who have undergone myocardial infarction leading to heart attack.”