Stars and the Solar System — Science STD 8 — Question

Write one word for: Variety of plants, animals and microorganisms found in an area.

Name two plant organ which is responsible for:
Making of food.

State whether the following statements are True or False: A zygote is formed as a result of fertilization.

What is the speed of sound in air?

Give names of two traditional methods and two modern methods of irrigation.

Paheli remembers that a magnet attracts a piece of iron towards it. Is attraction also a pull? What about repulsion between similar poles of two magnets? Is it a pull or a push ?

What is the mass of the earth?

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

Name any two human diseases caused by protozoa.

Name the technique which was used in producing ‘Dolly’ the sheep.