cbse sample paper 2025 to 2026

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Virat

Asked: October 11, 2025In: Class 10 Science

When excess of carbon dioxide is passed through lime water, the milkiness disappears because

Correct option – B. When excess CO₂ passes through limewater, the initially formed insoluble calcium carbonate (which causes milkiness) reacts further with CO₂ and water to form soluble calcium bicarbonate, clearing the milkiness from the solution completely. cbse sample paper 2025 ...

Ayushree

Asked: October 9, 2025In: Class 10 Science

In a genetic experiment, plants with pure round green seeds (RRyy) were crossed with plants with wrinkled yellow seeds (rrYY). (i) Show the gametes formed when F1 was self-pollinated. (ii) A total of 144 seeds were produced which developed into saplings. Show the ratio in which these traits are independently inherited in these 144 saplings.

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

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