Update

Muft Shiksha™ एक 100% Free Education Portal है 🇮🇳, जिसका उद्देश्य Class 9–12 के हर विद्यार्थी तक High-Quality Education को पूरी तरह मुफ्त पहुँचाना है। 🇮🇳 हम मानते हैं कि अच्छी शिक्षा किसी student की आर्थिक स्थिति पर निर्भर नहीं होनी चाहिए। 🇮🇳 हर विद्यार्थी को वही Quality Study Material, MCQs, Quizzes, Exam Preparation, Concept-Based Learning और Bilingual Support मिलना चाहिए, जो आमतौर पर महंगी Coaching या Premium Platforms में मिलता है। Muft Shiksha™ 🇮🇳 इसी सोच के साथ बनाया गया है

Subjects
0 reads0 ratings0 helpful

Why is oxygen being nearly one-fifth of the atmosphere considered sufficient for organisms?

Answer and explanation

Correct answer: Because it remains available for respiration and nitrogen helps maintain atmospheric balance

Answer: A. Oxygen makes up roughly 21% of dry air, or about one-fifth, and this proportion is generally enough to support aerobic respiration in ordinary conditions. Organisms use oxygen to release energy from food. Nitrogen makes up most of the remaining air and dilutes oxygen, so the atmosphere is not an oxygen-rich mixture like nearly pure oxygen, in which combustion would be much more intense. B is wrong because many organisms require oxygen for aerobic respiration. C is wrong because oxygen is present in the atmosphere and in many compounds, not only in rocks. D is wrong because oxygen does not remove all water vapour. Memory cue: “Enough oxygen for life, enough nitrogen for moderation.”

Related tags

OxygenNitrogenRespirationAtmospheric GasesCombustionAccounting PrinciplesTheory Base Of AccountingAccountancy

Was this question useful?

No ratings yetWrite a review / Rate this question

Student Reviews

No published reviews yet.

Add Muft Shiksha to your Home Screen

In Safari, tap Share, then Add to Home Screen.