The correct option is (b) Mushroom. Mushrooms are saprophytic organisms that secrete digestive juices onto dead organic matter outside their body. The food is broken down externally, and then the simpler nutrients are absorbed, unlike organisms like amoeba or paramoecium. Science ...
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The correct option is (c) 14. Silicon has the electronic configuration 2,8,4. Here, the second shell contains 8 electrons, while the third shell contains 4 electrons, which is exactly half of the second shell, satisfying the given condition. Science important questions ...
The correct option is (d) 11 (2,8,1). An element with atomic number 11 is sodium. It belongs to Group 1 and forms a basic oxide, sodium oxide (Na₂O), which reacts with water to form strong alkali sodium hydroxide. Science important questions ...
The correct option is (b) Zinc. When dilute sulphuric acid reacts with zinc, it releases hydrogen gas. This colourless gas burns with a pop sound when a burning matchstick is brought near, confirming the presence of hydrogen. Class 10 Science Sample ...
The correct option is (d) NaHCO₃. Sodium bicarbonate is a mild, non-corrosive base commonly used in baking soda. It is safe, weakly alkaline, and does not harm or corrode, unlike strong bases such as sodium hydroxide or calcium hydroxide. Class 10 ...