Choose the correct statement from the following. (i) The flavour in yogurt is due to acetaldehyde. (ii) Yogurt is produced by bacterial fermentation of milk. (iii) Penicillin is produced by bacteria. (iv) Spirulina is a non edible unicellular microorganism.
(i) and (ii) are correct
Yogurt is made when lactic acid bacteria such as Lactobacillus bulgaricus and Streptococcus thermophilus ferment milk sugar (lactose). So statement (ii) is correct.
During this fermentation the bacteria also produce acetaldehyde, the compound mainly responsible for the typical fresh, sharp flavour of yogurt. So statement (i) is correct.
Penicillin is produced by the fungus (mould) Penicillium notatum / Penicillium chrysogenum, not by bacteria, so statement (iii) is wrong. Spirulina is an edible cyanobacterium widely used as a protein-rich food supplement, so statement (iv) is also wrong.
Hence, (i) and (ii) are correct.
Important Questions from Biology in Everyday life
Due to which change in environment that Rekha's mother told Rekha not to sleep below the tree ?
Which of the following plays an important role in balancing oxygen and carbon dioxide in the atmosphere?
A fish dies when it is put in an aquarium filled with previously boiled water but cooled to room temperature. This happens because the water in the aquarium is:
Sameer asked a question to teacher that why food items perished during the summer and which of the following is the reason of that ?
Which process does not exist in nitrogen cycle ?
