0Q1. What is the importance of variation?
Q2. Differentiate between asexual and sexual mode of reproduction.
Q3. Why is DNA copying an essential part of the process of reproduction?
Q4. Draw male or female reproductive system in human beings.
Q5. What happens when egg is not fertilized?
Q6. Explain the bonding in carbon.
Q7. What are allotropes? Differentiate between graphite and diamond.
Q8. What is hydrocarbon? Differentiate between saturated and unsaturated carbon.
Q9. What do you mean by homologous series? Explain homologous series of alkanes.
Q10. Explain Snell’s law of reflection and refraction.
Q11. Draw diagrams of image formation by following in different cases:
(a) Convex mirror
(b) Concave mirror
(c) Convex lens
Q12. Define refractive index. Draw the diagram for refraction of light ray through the glass slab.
Q13. An object is placed at a distance of 20cm from a convex mirror of focal length 25cm.Calculate the position of the image and discuss its nature.
Q14. An object is placed 24cm from a concave mirror. Its image is inverted and doubles the size of object. Find the focal length of the mirror and the position where the image is formed.
