Question

Identify the statement(s) which is/are true from the following.

• A. Tiny thread-like structures observed on rotten bread are Lactobacillus.
• B. Mould is used for conversion of milk into curd.
• C. A little amount of buttermilk is added to milk to obtain curd.
• D. Bacteria can either be useful or harmful to humans.

Answer 1

Answer: (C), (D)

The correct options are
C A little amount of buttermilk is added to milk to obtain curd.
D Bacteria can either be useful or harmful to humans.

$\bullet$ Tiny thread-like structures observed on rotten bread are bread moulds.
$\bullet$ Lactobacillus is used for the conversion of milk into curd.
$\bullet$ Buttermilk is added to milk to obtain curd. It contains Lactobacillus bacteria which help in the conversion.
$\bullet$ Bacteria can be useful or harmful to humans. Lactobacillus and Rhizobium are examples of useful bacteria. Many harmful bacterias exist that are known to cause diseases in humans.