"Name two simple organisms having the ability of regeneration.

What are fossils? How are they formed? Described in brief two methods of determining the age of fossils. State any one role of fossils in the study of the process of evolution.

Write the number of covalent bonds in the molecule of butane, C₄H₁₀

Which of the following are always at the second trophic level of food chains?

Carnivores, Autotrophs, Herbivores

Draw a ray diagram to show the path of the reflected ray corresponding to an incident ray of light parallel to the principal axis of a convex mirror and show the angle of incidence and angle of reflection on it.