Curd becomes sour because bacteria like Lactobacillus multiply in warm conditions, producing lactic acid. The acid gives curd its sour taste. Higher temperatures speed up this bacterial growth and souring process. class 8 science chapter 2 the invisible living world beyond ...
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The bread near the sink shows mold growth due to warmth and moisture. The refrigerated bread remains unchanged because cold slows microbial activity. This proves microorganisms need warmth and moisture to grow effectively. class 8 science chapter 2 the invisible living ...
Place moist bread slices in three conditions: warm air, cold fridge and sealed airtight. After three days, compare mold growth. Mold grows best in warmth with air and moisture, proving microbes need these conditions. Class 8 NCERT Science Curiosity Chapter 2 ...
(i) Bacteria live everywhere, including our gut. (ii) Yeast is used in baking to make bread rise. (iii) Rhizobium bacteria live in legume roots and fix nitrogen for plant growth. Class 8 NCERT Science Curiosity Chapter 2 The Invisible Living World: ...
Snehal was testing how composting is affected by mixing dried leaves with kitchen waste. Pit A with leaves would compost faster and smell less due to better air flow and carbon balance compared to Pit B. Class 8 NCERT Science Curiosity ...