Welcome To My School Study
Do You Know
Q1. Wilting of Leaves (Abscisic Acid)
Correct Answer: Abscisic acid
- Description: Abscisic acid (ABA) is a plant growth inhibitor. It is often called the “stress hormone” because it helps plants survive adverse conditions. It is responsible for the closing of stomata and the wilting (falling off) of leaves and fruits.
- Other Options: Auxins and Gibberellins promote cell elongation and growth, while Cytokinins promote cell division.
Q2. Power of Accommodation
Correct Answer: Power of accommodation
- Description: This is the ability of the eye lens to adjust its focal length. To see nearby objects clearly, the ciliary muscles contract to make the lens thicker; for distant objects, the muscles relax to make the lens thinner.
- Other Options: Myopia and Hypermetropia are vision defects where a person cannot see distant or nearby objects clearly, respectively.
Q3. Sodium Hydrogen Carbonate (Baking Soda)
Correct Answer: B) Baking soda
- Description: Its chemical formula is $$NaHCO_3$$. It is commonly used in baking to make cakes and bread fluffy by releasing carbon dioxide gas when heated. It also acts as an antacid to neutralize stomach acidity.
- Other Options: Washing soda is $$Na_2CO_3 \cdot 10H_2O$$, and Bleaching powder is $$CaOCl_2$$.
Q4. Complete Digestion of Food (Small Intestine)
Correct Answer: Small intestine
- Description: Although digestion starts in the mouth and continues in the stomach, the Small Intestine is the site for the complete digestion of carbohydrates, proteins, and fats. It receives secretions from the liver (bile) and pancreas to finish the process.
- Other Options: The Stomach mainly digests proteins, and the Large Intestine primarily absorbs water and salts from undigested food.
Q5. Electric Current Production (Generator)
Correct Answer: Generator
- Description: An electric generator is a device that converts mechanical energy into electrical energy. It works on the principle of electromagnetic induction.
- Other Options: An Ammeter is used to measure the current in a circuit, while a Motor does the opposite of a generator (converts electrical energy into mechanical energy).