Both A and R are true, and R is the correct explanation of A. Sexual reproduction introduces genetic variations, increasing adaptability to environmental changes. These variations give better chances of survival compared to asexual reproduction. Hence, both assertion and reason ...
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A is true but R is false. Rusting of iron is a chemical process but not endothermic; it is a slow exothermic reaction, releasing little heat. Since the heat released is negligible, it often goes unnoticed, making the given ...
The correct option is (a) Broken down by biological processes. Biodegradable substances like food waste, paper, and leaves decompose naturally through bacteria and fungi, turning into harmless products. They don’t accumulate in the environment and are eco-friendly compared to plastics. cbse ...
The correct option is (c) CFCs; Ozone. In 1987, the Montreal Protocol was signed to stop production of chlorofluorocarbons (CFCs), which deplete the ozone layer that protects Earth from harmful ultraviolet radiation. This step helped save the ozone. cbse sample paper ...
The correct option is (c) scattering of light. When sunlight enters the atmosphere, fine particles like dust and gases scatter the light in all directions. This scattering makes the sky appear blue and causes reddish sunsets. CBSE Class 10 Science Question ...