Question

Consider the following statements regarding ecology. Choose true and false and select the most accurate answer.
I. Streptococcus thermophilus and Lactobacillus bacteria are responsible for the production of yogurt which is partially fermented by yeast.
II. When an individual takes curd in his/her diet, he/she occupies the fourth trophic level of the detritus food chain.
III. Typical aroma of curd is formed by Lactobacillus, while acid is formed by Streptococcus thermophilus.

• A. Statement I and II are true
• B. Statement II and III are true
• C. Statement I is true while II and III are false
• D. All statements are true

Answer 1

The correct option is A Statement I and II are true

An individual can occupy different trophic level depending on the food he/she eats. When an individual takes curd in his/her diet, he/she occupies the fourth trophic level of the food chain. In this, plant occupies primary, cow occupies secondary, milk occupies tertiary and curd occupies fourth trophic level as it contains bacteria. Yoghurt/curd is also a commercially fermented dairy product. It is produced by a starter culture of Streptococcus thermophilus and Lactobacillus at 35${}^o$C+55${}^o$C and then partial fermentation by yeast. Streptococcus thermophilus and Lactobacillus both produces aroma in curd by producing three amino acids such as leucine, phenylalanine and methionine.

Thus, the correct answer is option A.