Correct Option is (a). States like Madhya Pradesh, Himachal Pradesh and Odisha contain vast areas of reserved forests, managed by the government for conservation. These forests restrict human activity and aim to preserve biodiversity and maintain ecological balance.
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The decline in per capita water availability affects irrigation and groundwater levels, reducing agricultural productivity. As crops fail and rural income drops, it indirectly harms livelihoods, forcing migration and increasing pressure on urban areas. Correct Option is (c).
Correct option – B (I and III). Aluminium oxide and zinc oxide are amphoteric and react with both dilute HCl and aqueous NaOH. Calcium oxide is basic (reacts with acid) and SO₂ is acidic (reacts with base). cbse sample paper 2025 ...
Correct option – B. Iron nail in P (CuSO₄) undergoes displacement: copper ions reduced to copper metal, giving a brownish coating; in Q (AgNO₃) iron displaces silver, producing a silver coating on the nail during the reaction. cbse sample paper 2025 ...
Correct option – D. Sodium hydroxide. Among the options, NaOH is a strong, highly soluble base producing a high concentration of OH⁻ in solution; magnesium hydroxide is sparingly soluble and both acids give low pH values generally. cbse sample paper 2025 ...