CBSE Class 10th Solutions Maths, Science

  Questions 1. What is the importance of DNA copying in reproduction? Answer: DNA – Deoxyribonucleic acid is the genetic material that is present in the cells of all organisms. DNA carries genetic information from one generation to the other and this helps in producing organisms of its own types. DNA copying is must for inheriting the traits from the parents. Any variations in DNA copying will give rise to origin of new species. 2. Why is the variation beneficial to the species but not necessarily for the individual? Answer: The reason why the variation is beneficial to the species than individuals is because sometimes the climatic changes have a drastic effect on the species which makes their survival difficult. For examples, if the temperature of the water body increases, then are might be certain species of microorganisms which might die. This may result in disturbance in the environment. So, variation is beneficial to species and not for the individuals. Activity ...

  Real & Virtual Image  Image formed by a plane mirror is always virtual and erect. The size of the image is equal to that of the object. The image formed is as far behind the mirror as the object is in front of it We can see objects Only because object reflects light that falls on it. This reflected light, when received by our eyes, enables us to see things. We are able to see through a transparent medium as light is transmitted through it. Because of Light there occurs image formation by mirrors, the twinkling of stars, the beautiful colours of a rainbow, bending of light by a medium etc. light seems to travel in straight lines as it gets stopped by opaque objects. That’s the reason behind formation of shadows. opaque object on the path of light becomes very small , light has a tendency to bend around it and not walk in a straight line – an effect known as the diffraction of light. light often behaves somewhat like a stream of particles New Quantum theory reconciles the ...