Olympiad Science Class-9 Paper-4

Test Preparation on Science Olympiad Class-9 Test Prep-4

1.

Ordinary table salt is sodium chloride. What is baking soda?

1Potassium chloride
2Potassium carbonate
3Potassium hydroxide
4Sodium bicarbonate

2.

Ozone hole refers to-

1hole in ozone layer
2decrease in the ozone layer in troposphere
3decrease in thickness of ozone layer in stratosphere
4increase in the thickness of ozone layer in troposphere

3.

Pine, fir, spruce, cedar, larch and cypress are the famous timber-yielding plants of which several also occur widely in the hilly regions of India. All these belong to-

1angiosperms
2gymnosperms
3monocotyledons
4dicotyledons

4.

Pollination is best defined as-

1transfer of pollen from anther to stigma
2germination of pollen grains
3growth of pollen tube in ovule
4visiting flowers by insects

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