Intellectual Olympiad in Natural Science - 2026 ongoing

Subject: Natural Science
Level: VII
Category: student
Quiz questions: in English
Example question: A sealed terrarium contains soil, water, plants, and air. After several weeks, which statement best explains why the total mass remains nearly constant? Matter is continually recycled within the closed system., Plants create new matter from sunlight alone., Water disappears when plants absorb it., Oxygen is converted entirely into soil.