How do Organisms Reproduce? — Science STD 10 — Question

State whether convex lens has a real focus or a virtual focus.

In a d.c. motor, why must the current to the coil be reversed twice during each rotation?

Write the full form of:

1. LPG.
2. CNG.

What colours lie on the two sides of the ‘green colour’ in the spectrum of white light?

What is the name of surgical method of birth control in human females in which the oviducts are cut and ligated (tied) at both ends?

What constitutes the link between one generation and the next?

Which term is used to indicate the development of unpleasant smell and taste in fat and oil containing foods due to aerial oxidation (when they are kept exposed for a considerable time)?

Write the balanced chemical equation for the reaction which takes place.

State a peculiar (or remarkable) property of plaster of Paris.

Photosynthesis converts energy X into energy Y. What are X and Y?