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Cross: RRyy × rrYY → F₁: RrYy (round yellow). On self-pollination, F₂ shows 9:3:3:1 ratio (round yellow : round green : wrinkled yellow : wrinkled green) due to independent assortment of genes. cbse sample paper 2026 cbse sample paper 2025-26 class 10
A nerve cell (neuron) has dendrites, a cell body and an axon. Dendrites receive impulses, transmitted through the axon to the next neuron or effector via synapses using neurotransmitters. cbse sample paper 2026 cbse sample paper 2025-26 class 10
Food Chain 1: Grass → Rabbit → Fox → Tiger → Vulture Food Chain 2: Trees → Insects → Frog → Snake → Owl Both chains interlink to form a food web showing energy flow. cbse sample paper 2025 cbse sample paper ...
Water is transported through the xylem using transpiration pull. Evaporation from leaf surfaces creates a negative pressure, pulling water upward. Cohesion, adhesion, and capillary action help maintain continuous upward flow. cbse sample paper 2025 cbse sample paper 2025-26 class 10 science
(i) Fish: Two-chambered heart; oxygenated and deoxygenated blood mix before reaching tissues. (ii) Humans: Four-chambered heart prevents mixing, ensuring separate circulation of oxygenated and deoxygenated blood for efficient oxygen supply. cbse sample paper 2025 cbse sample paper 2025-26 class 10 science
