Diversity In Living Organisms — Science STD 9 — Question

Specify any two parts of the plant, where these tissues are present.

Discuss the implications of the following statement: “It is interesting to note that poultry is India’s most efficient converter of low fibre food stuff (which is unfit for human consumption) into highly nutritious animal protein food.”

When a ball is thrown inside a mocking bus, does its kinetic energy depend on the speed of the bus? Explain.

A body starts to slide over a horizontal surface with an initial velocity of 0.5m/s. Due to friction, its velocity decreases at the rate 0.105m/s². How much time will it take for the body to stop?

A student placed a gas jar containing air in the upside down position over a gas jar full of red-brown bromine vapours. He observed that the red brown colour spread upwards into the jar containing air. Based on this observation, the student concluded that it is only the bromine vapour which moves up and diffuses into air in the upper jar, the air from the upper jar does not move down by diffusion into the lower jar containing bromine vapours. Do you agree with this conclusion of the student? Give reason for your answer.

Why are gases highly compressible?

Give two uses of graphical representation of motion.

Name any two groups of micro - organisms from which antibiotics could be extracted.

The maximum speed of a train is 80km/h. It takes 10h to cover a distance of 400km. Find the ratio of its maximum speed to its average speed.

Give reason:

1. Plasma is found in the stars.
2. The molecules of a solid have the strongest intermolecular forces.