Light — Science STD 8 — Question

Which force do the animals apply while moving, chewing and doing other activities?

Name the unit used to measure the loudness of sound. Also write its symbol.

If the area of my head were 15 cm x 15 cm how much force will air expert on my head ?

Name the process in yeast that converts sugars into alcohol.

In the following situations identify the agent exerting the force and the object on which it acts. State the effect of the force in each case. Taking out paste from a toothpaste tube.

Give a suitable word for each of the following statements.
(a) The site which responds to a hormone.
(b) Name of a gland which transports secretions through ducts.
(c) Chemicals which control changes at adolescence stage.
(d) It marks the beginning of reproductive period.

Find out the wrong statements and write them in their correct form. Water which is suitable for drinking is called soft water.

An electric current is passed through a conducting solution. List any three possible observations.

Fill in the blanks:
The planet which is farthest from the sun is _________.

Where is iron present in our body?