Question 8 โ€” Curd turning sour - Questions at the end of the chapter - Chapter 2 Class 8 - The Invisible Living World: Beyond our (Curiosity)

Last updated at June 7, 2026 by

Q 8
Question

A student finds that curd left out for a day becomes more sour. Give two possible explanations.

๐Ÿ”— Concept: 2.4.2 Microorganisms and Food

Show answer Hide answer
More bacteria grow, and they make more lactic acid.

Explanation

  • Warm conditions let Lactobacillus multiply more.
  • So there are more bacteria over the day.
  • These bacteria keep making lactic acid.
  • More lactic acid makes the curd taste more sour.
Bacteria multiply and produce more lactic acid, so the curd gets more sour.
Remove Ads Share on WhatsApp
CA Maninder Singh's photo - Co-founder, Teachoo

Made by

CA Maninder Singh

CA Maninder Singh is a Chartered Accountant with 16+ years of practical experience and 20+ years of teaching experience. At Teachoo, he simplifies Accounts, Tax and GST with step-by-step examples so students can apply concepts confidently in exams and real life.

For an uninterrupted learning experience, students can use Teachoo Black to remove ads and focus better.