NSO Class 3 Science Olympiad Question Bank & Chapter Notes (2026-2027)

The National Science Olympiad (NSO) by SOF tests inquiry-based scientific reasoning in young children. Rather than asking "What is photosynthesis?", NSO questions present a potted plant covered with a black cardboard box and ask what happens to the starch content in its leaves after 48 hours.

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Key Science Units & Focus Topics

1. Plants: Parts & Adaptations

Roots: Tap roots (carrot, radish) vs Fibrous roots (grass, wheat, onion).

Stem: Climbing stems with tendrils (money plant, grapevine) vs underground stems (potato, ginger).

Leaves: Stomata (breathing pores), chlorophyll, and leaf venation.

2. Animals: Habitats, Feeding & Defense

Herbivores, Carnivores, and Omnivores (e.g., bears, crows, humans).

Body Coverings: Fur, scales (snakes, fish), feathers (birds), and shells (tortoise, snails).

Insects: 6 legs, 3 body segments (head, thorax, abdomen), and spiracles for breathing.

3. Human Body & Senses

Five sense organs and internal systems: Skeletal system (206 bones in adult), muscular system, digestive tract.

Teeth: Milk teeth (20) vs Permanent teeth (32), incisors for biting, molars for chewing.

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