Fermentation

noun (uncountable)

/ˌfɜːmenˈteɪʃən/

Fermentation is an anaerobic metabolic process in which microorganisms such as bacteria, yeast, or fungi convert organic compounds — primarily sugars — into simpler products such as ethanol, lactic acid, or carbon dioxide, without the use of oxygen. The process yields far less ATP than aerobic respiration (2 ATP vs. ~30–32 ATP per glucose molecule). Industrially, fermentation underpins the production of biofuels, antibiotics, and fermented foods; under India's National Biofuel Policy 2018 (amended 2022), second-generation ethanol produced via fermentation of lignocellulosic biomass is a strategic priority to achieve 20% ethanol blending in petrol by 2025.

✍️ Usage in a UPSC answer

India's revised National Biofuel Policy 2022 prioritises second-generation ethanol produced through the fermentation of surplus rice, damaged food grain, and sugarcane juice, aiming to reduce crude oil import dependency by an estimated ₹30,000 crore annually.

Synonyms

anaerobic digestionzymosisputrefaction (partial overlap)biotransformationleavening

Antonyms

aerobic respirationoxidative phosphorylationpasteurisation

🌱 Word Family

ferment (noun/verb), fermentable (adjective), fermentative (adjective), fermenter/fermentor (noun)

🔡 Root

Latin fermentum = leaven, yeast; from fervere = to boil or seethe (describing the bubbling appearance)

📜 Etymology

From Latin fermentatio, a noun of action from fermentare (to leaven), derived from fermentum (leaven, yeast), which in turn comes from fervere (to boil, to seethe). The Latin root vividly captures the visible bubbling that accompanies CO₂ production during fermentation. Louis Pasteur demonstrated in 1857 that fermentation is a biological process caused by living microorganisms, overturning purely chemical explanations. The word has been in English since the 14th century.

🧠 Memory Hook

Fermentation comes from Latin fervere (to boil) — picture yeast making sugary liquid 'boil' with bubbles of CO₂ even without fire. The word literally describes the frothy, boiling appearance of beer or bread dough as microbes feast anaerobically.

⚗️ General Science 📖 Seen in: Human Body Systems — Organ Systems, Ph...

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