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 ...
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X: Alcohol (ethanol, C₂H₅OH) – a good solventY: Hydrogen gas (H₂)Z: Sodium ethoxide (C₂H₅ONa) – used in making vegetable ghee Reaction: 2C₂H₅OH + 2Na → 2C₂H₅ONa + H₂↑ 10 years solved cbse sample paper for class 10 science 2026 board exam ...
When a piece of magnesium ribbon is ignited, light and heat are produced. Magnesium ribbon on burning in air is an exothermic reaction. correct option is (c). CBSE Sample Paper Class 10 Science 2025-26 Download cbse sample paper for class 10 science
In herbivores, the small intestine is very long because plant-based food, rich in cellulose, takes longer to digest. In carnivores, it is comparatively shorter as meat is easier to digest. Thus, intestine length depends on the type of diet. 2025-26 sample ...
The pancreas secretes digestive enzymes like amylase, lipase, and trypsin that break down carbohydrates, fats and proteins. Bile juice from the liver emulsifies fats into tiny droplets, aiding lipase action and ensuring efficient digestion and absorption of nutrients. latest cbse sample ...