CBSE ADDA

Q. Viruses are considered as being on the border line between living and non-living organisms,Why? Ans: Viruses is nonliving out side living cells but grows and multiplies inside living cell so,viruses are considered as being on the border line between living and non-living organisms.The study of viruses is called Virology. Questions: What does Sargasso Sea woe its name to? Ans: Sargasso Sea woe its name to Sargassum, a particular sea weeds that grow abundantly in sea. Sailor avoids this sea as their boat stuck in the tangled mass of seaweeds. Questions: What are the difference between the cell of bacteria and the cell of other living body? Ans: The difference between the cell of bacteria and the cell of other living body are (i) Cell wall is not made up of cell wall (ii) Do not have nucleus (iii)Does not have membrane bound organelles Questions: Do red and brown algae have chlorophyll? Ans: Yes, red and brown algae have pigment of colour which cover the colour of ch...

Solution of chapter Heat and Temperature Basic science Class 7 A. Answer these question in not more than 20 words 1. Give an example to show that heat is a form of energy? Answer: When we heat a pan of water, the water boils and at its temperature rises. The energy for this rise in temperature comes from heat. This shows that heat is a form of energy. 2. What is temperature? Name the scale used to measure it? Answer: Temperature of a body is the measure of the hotness or coldness of the body. Celsius and Fahrenheit are the scales used to measure temperature. Thermometry is branch of physics which deals with the measurement of temperature. 3. If hotness and coldness of a body is relative, how do we measure its degree of hotness? Answer: We measure the degree of hotness or coldness of a body by measuring its temperature and comparing with standard temperature scale. 4. Mention three things that heat causes in substance? Answer: Following are the three changes that hea...