1.
Ordinary table salt is sodium chloride. What is baking soda?
A. Potassium chloride
B. Potassium carbonate
C. Potassium hydroxide
D. Sodium bicarbonate
Answer & Explanation
Answer: Option D
Explanation:
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2.
Ozone hole refers to
A. hole in ozone layer
B. 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
Answer & Explanation
Answer: Option C
Explanation:
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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
A. angiosperms B. gymnosperms
C. monocotyledons D. dicotyledons
Answer & Explanation
Answer: Option B
Explanation:
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4.
Pollination is best defined as
A. transfer of pollen from anther to stigma
B. germination of pollen grains
C. growth of pollen tube in ovule
D. visiting flowers by insects
Answer & Explanation
Answer: Option A
Explanation:
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5.
Plants receive their nutrients mainly from
A. chlorophyll B. atmosphere
C. light D. soil
Answer & Explanation
Answer: Option D
Explanation:
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6.
Movement of cell against concentration gradient is called
A. osmosis
B. active transport
C. diffusion
D. passive transport
Answer & Explanation
Answer: Option B
Explanation:
Active transport, this is the only transport method that can move species against their concentration gradient (from low to high concentration). Facilitated diffusion only moves species down their concentration g