Can you suggest some questions that will definitely cone in class 10 cbse board exam of science.
Answers
Explain why a ray of light passing through the centre of curvature of concave minor gets reflected along the same path.
Ans.
The light falling on the centre of curvature is reflected back along the same path because the incident ray falls on the mirror along the normal to the reflecting surface.
Q. What is the important function of presence of ozone in earth’s atmosphere?
Ans.
Ozone is the Earth’s natural process for all life forms. It shields our planet from the UV radiations, as these ultraviolet rays are harmful for all the living things. Therefore, any change in the size of this layer will automatically affect the life of people, plants and animals living on earth.
Q. Dark reaction of photosynthesis does not need light. Do plants undergo dark reaction at night? Explain.
Ans.
Dark reaction does not mean that it occurs in the absence of light i.e., at night. Infact, it is the reaction occurring simultaneously with light reaction. It a chemical process occurring independent of light. This reaction is completely based on enzymes.