Biology - Questions (Section-1)
1Movement of cell against concentration gradient is called
A. osmosisB. active transport
C. diffusion D. passive transport
View Answer
2Ordinary table salt is sodium chloride. What is baking soda?
A. Potassium chlorideB. Potassium carbonate
C. Potassium hydroxide D. Sodium bicarbonate
View Answer
3Ozone hole refers to
A. hole in ozone layerB. decrease in the ozone layer in troposphere
C. decrease in thickness of ozone layer in stratosphere D. increase in the thickness of ozone layer in troposphere
View Answer
4Pine, 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
A. angiospermsB. gymnosperms
C. monocotyledons D. dicotyledons
View Answer
5Plants receive their nutrients mainly from
A. chlorophyllB. atmosphere
C. light D. soil
View Answer
6Pollination is best defined as
A. transfer of pollen from anther to stigmaB. germination of pollen grains
C. growth of pollen tube in ovule D. visiting flowers by insects
View Answer