Cell - structure and functions — Science STD 8 — Question

What is a spring balance?

X is a human activity which will cause an increase in temperature of earth’s atmosphere leading to global warming. It can cause soil erosion making the soil infertile and lead to desertification. It can cause decrease in rainfall but increase the flooding of rivers. It can also affect water cycle and lead to the extinction of many wild species. What is X?

Why do tyres of cars wear out gradually?

Fill in the following blanks with suitable words:
The other name of egg cell is ______________.

What name is given to the maximum displacement of a vibrating body from its central position?

What types of fertilization takes place in the following?
(a) Cow (b) Frog (c) Humans (d) Fish (e) Hen.

Name the hormone whose deficiency in body causes goiter.

Name one example from everyday life where wheels (or rollers) are used to reduce friction.

State whether the following statements are True or False:
Oviparous animals give birth to young ones.

Can a liquid exert pressure upwards?