science for 3 grade

Question: How is work measured? Answer: Work is measured by the product of the force and the distance covered. i.e., W = F x ..

Question: Give examples of some of the movements shown by plants. Answer: Movements as in animals is absent in plants except in cases of sperm cells of ferns and mosses swimming towards the egg. In plants, movement is associated with the growth of the plants. For example, the shoot syste..

Question: What are the two components of the environment? Answer: The two components of the environment are the biotic (plants, animals and microbes) and the abiotic (non-living component..

Question: Define heredity. Give some common instances of inherited traits in Humans. Answer: Heredity may be defined as the transmission of characteristics through generations. Common instances of inherited traits may include, colour of skin, colour of eyes, diseases like, diabities and ..

Question: A motor converts one form of energy to another. Name the two forms. Answer: Electrical energy to mechanical ener..

Question: State Mendeleev's Periodic Law. Answer: Mendeleev's Periodic Law states that the physical and chemical properties of elements are periodic function of their atomic weight..

Question: What is the unit of refractive index? Answer: Refractive index is the ratio of velocity of light in two media and hence it is a mere number without any uni..

Question: What is respiration? Answer: Respiration is the breakdown of organic compounds into simpler compounds accompanied by the release of energy in the form of AT..

Question: What is mass flow system? Answer: The transport of materials in bulk across the plant or animal body through the vascular tissue is called the mass flow syste..

There is a cotton-like black coloured growth on the brea..