Ozone is a molecule composed of three oxygen atoms. It forms a protective layer in Earth’s stratosphere, blocking harmful ultraviolet radiation. Ground-level ozone is a component of smog and can be harmful to health.
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Herbivores are animals that primarily consume plants, while carnivores are meat-eating animals that primarily feed on other animals. Their dietary preferences are adapted to the types of food they consume.
The small intestine is a vital organ in digestion, where nutrients from food are absorbed into the bloodstream. It consists of the duodenum, jejunum, and ileum, playing a key role in nutrient absorption.
Veins are blood vessels that carry deoxygenated blood back to the heart. They have thinner walls than arteries and often contain valves to prevent blood from flowing backward.
CBSE Rationalised syllabus Science Class 10 sample question paper 2023-2024