Class 9 Science NCERT Solution Chapter 6: Tissues Question 1. What is a tissue ? Answer: Tissue is a group of related cells that have a common origin and perform a common function. Question 2. What is the utility of tissues in multicellular organisms ? Answer: Division of Labour: Tissues bring about division of […]
 Class 9 Science NCERT Solutions Chapter 5: The Fundamental Unit of Life Question 1. Who discovered cell, and how ? Answer: Robert Hooke (1665). He thinly pared a piece of cork and observed it under his self made primitive microscope. The scientist found that cork possesses a number of small box-like structures which he named
 Class 9 Science NCERT Solutions Chapter 4: Structure of the Atom Question 1. What are canal rays ? Answer: Canal rays also called anode rays, are seen moving from the anode towards the cathode in the specially designed discharge tube. However, they do not originate from the anode. Question 2. If an atom contains one
 Class 9 Science NCERT Solutions Chapter 3: Atoms and Molecules Question 1. In a reaction, 5.3 g of sodium carbonate reacted with 6.0 g of ethanoic acid. The products were 2.2 g of carbon dioxide, 0.9 g of water and 8.2 g of sodium ethanoate. Show that these observations are in agreement with the law
Class 9 Science NCERT Solutions Chapter 2: Is Matter Around Us Pure Question 1. What is meant by a pure substance? Answer: In terms of science, a pure substance may be defined as a single substance or matter which cannot be separated into other kinds of matter by any physical process. All pure elements and
 Class 9 Science NCERT Solutions Chapter 1: Matter in Our Surroundings Question 1. Which of the following are matter ? Chair, air, love, smell, hate, almonds, thought, cold, cold drink, smell of perfume. Answer: Chair, air, smell, almonds, cold drink, smell of perfume are matter. Please note that the smell whether pleasant or foul is
Class 8 Science NCERT Solutions Chapter 18: Pollution of Air and Water Question 1. What are the different ways in which water gets contaminated? Answer. Water gets contaminated due to the addition of substances harmful to health. Sewage, agricultural chemicals, and industrial waste are some of the major contaminants of water. Question 2. At an
Class 8 Science NCERT Solutions Chapter 17: Stars and the Solar System Choose the correct answer in Questions 1-3: Question 1. Which of the following is NOT a member of the solar system? (a)Â An asteroid (b)Â A satellite (c)Â A constellation (d)Â A comet Answer. (c) A constellation. Question 2. Which of the following is NOT a planet
Class 8 Science NCERT Solutions Chapter 16: Light Question 1. Suppose you are in a dark room. Can you see objects in the room? Can you see objects outside the room? Explain. Answer. We cannot see objects in the darkroom. But, we can see objects outside the room, in case there is light outside the
Class 8 Science NCERT Solutions Chapter 15: Some Natural Phenomena Select the correct option in Questions 1 and 2. Question 1. Which of the following cannot be changed easily by friction? (a)Â A plastic scale (b)Â copper rod (c)Â An inflated balloon (d)Â A woolen cloth. Answer. (b) A copper rod. Question 2. When a glass rod is rubbed
