Eight Class Science Paper

Write the answers of the following questions.
What is pollination?
The transfer of pollen grains from the anther of a flower to the stigma of the carpel is called pollination.
Define chemical change. Give examples.
A chemical change is one in which a new substance is formed. Chemical changes are permanent and are not easy to reverse.
Examples: burning of papers, rusting of iron, turning of milk into yogurt
What is conduction?
The transfer of heat through matter without the actual movement of particles from their position is called conduction.
State law of refraction.
There are two law of refraction.
The incident ray, the refracted ray and the normal at the point of incidence, all lie in the same plane.
The ratio of the speed of light in vacuum to its speed in another medium is always constant.
Chose the correct option.
a
d
e
d
a
b
c
c
c
b

Write down the proper term/word against each statement.
Male and female sex cells                                      sperm & egg
Most grasses are pollinated by           wind
It protects a seed seed coat
It can maintain the temperature of drinks vacuum flask
The transfer of heat by direct contact of molecules