Why Do we Fall Ill — Science STD 9 — Question

What is bilateral symmetry?

Name any two simple and two complex permanent tissues in plants.

A train starting from a railway station and moving with uniform acceleration attains a speed 40km/h⁻¹ in 10 minutes. Find its acceleration.

Define velocity. What is the SI unit of velocity?

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?

Write advantages of beekeeping.

Write down two advantages of fertilizer over manure.

The earth and the moon are attracted to each other by gravitational force. Does the earth attract the moon with a force that is greater or smaller or the same as the force with which the moon attracts the earth? Why?

Name the chemical compound contains in nail-polish remover.