Question

Identify the bacteria that promote the formation of curd.
A. Vibrio cholera
B. Lactobacillus
C. Mycobacterium leprae
D. Clostridium tetani

Answer 1

Hint: The formation of curd requires an acidic species of bacteria to act upon. These species of bacteria belong to the acidophilus category that has a distinctive function of breaking down lactose present in milk and converting it to lactic acid. Thereby the formation of milk will take place.

Complete answer:
Bacteria have been classified into different categories according to the environment they can stay and work. Based on their pH, bacteria have been classified as –Alkaliphilus, Neutrophils, and Acidophilus.
Also, bacteria are classified based on their shape (whether spherical, rod-shaped, or comma-shaped) or Gram-negative bacteria. Also, bacteria are pathogenic and non-pathogenic.
Vibrio cholerae is the strain of bacteria that causes cholera. It thrives in brackish or saltwater environments and can infect the body by taking undercooked or raw marine products.
Therefore, option (a) is not correct.
Mycobacterium leprae is the bacteria causing leprosy. It is a chronic infectious disease affecting the peripheral nerves and attacks the skin, eyes, nose, and muscles. It can infect people of any age whether children or adults.
Therefore, pathogenic bacteria cannot be consumed and so, option (c) is also incorrect.
Clostridium tetani are the normal soil bacteria that are the causative agent of tetanus. They are rod-shaped which can grow up to a length of micron. It is found in the forest and woods, so whenever there is a cut due to a wooden plank it is advised to take the vaccination. Therefore, option (d) is also not correct.
Lactobacillus is a gram-positive bacterium, aero-tolerant, rod-shaped, and non-spore-forming bacteria. They belong to the community of lactic acid bacteria and encourage the conversion of lactose to lactic acid. Therefore, these non-pathogenic bacteria are the correct option.

Hence, the correct answer is option (B).

Note: Lactobacillus is also found in foods like yogurt and is said to be symbiotic. It is probiotic bacteria that is good for the intestine and can provide immunity and good digestive ability to the body. Therefore, these bacteria are also found in health and digestive drinks like Yakult.