Atoms and Molecules — Science STD 9 — Question

Classily the following seeds into dicot and monocot: wheat, maize, bean, gram.

How are high yielding breeds of poultry advantageous over indigenous breeds?

As an incharge of a grain store, how will you find out the presence of pests?

Describe the various methods of controlling pests attacking stored grains.

A boy throws a rubber ball vertically upwards. What type of work, positive or negative, is done:

1. By the force applied by the boy?
2. By the gravitational force of earth?