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BIOLOGY MCQs

Total Questions : 2561 | Page 1 of 257 pages
Question 1. Ordinary table salt is sodium chloride. What is baking soda?
  1.    Potassium chloride
  2.    Potassium carbonate
  3.    Potassium hydroxide
  4.    Sodium bicarbonate
 Discuss Question
Answer: Option D. -> Sodium bicarbonate
Question 2. 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
  1.    angiosperms
  2.    gymnosperms
  3.    monocotyledons
  4.    dicotyledons
 Discuss Question
Answer: Option B. -> gymnosperms
Question 3. Ozone hole refers to
  1.    hole in ozone layer
  2.    decrease in the ozone layer in troposphere
  3.    decrease in thickness of ozone layer in stratosphere
  4.    increase in the thickness of ozone layer in troposphere
 Discuss Question
Answer: Option C. -> decrease in thickness of ozone layer in stratosphere
Question 4. Pollination is best defined as
  1.    transfer of pollen from anther to stigma
  2.    germination of pollen grains
  3.    growth of pollen tube in ovule
  4.    visiting flowers by insects
 Discuss Question
Answer: Option A. -> transfer of pollen from anther to stigma
Question 5. Plants receive their nutrients mainly from
  1.    chlorophyll
  2.    atmosphere
  3.    light
  4.    soil
 Discuss Question
Answer: Option D. -> soil
Question 6. Movement of cell against concentration gradient is called
  1.    osmosis
  2.    active transport
  3.    diffusion
  4.    passive transport
 Discuss Question
Answer: Option B. -> active transport
Question 7. Photosynthesis generally takes place in which parts of the plant?
  1.    Leaf and other chloroplast bearing parts
  2.    steam and leaf
  3.    Roots and chloroplast bearing parts
  4.    Bark and leaf
 Discuss Question
Answer: Option A. -> Leaf and other chloroplast bearing parts
Question 8. Most fish do not sink in water because of the presence of:
I. swim bladder
II. air bladder
III. air sacs
IV. air in spongy bones
  1.    I and II are correct
  2.    II and III are correct
  3.    III and IV are correct
  4.    I, II, III and IV are correct
 Discuss Question
Answer: Option A. -> I and II are correct
Question 9. Plants synthesis protein from
  1.    starch
  2.    sugar
  3.    amino acids
  4.    fatty acids
 Discuss Question
Answer: Option C. -> amino acids
Question 10. Plants absorb dissolved nitrates from soil and convert them into
  1.    free nitrogen
  2.    urea
  3.    ammonia
  4.    proteins
 Discuss Question
Answer: Option A. -> free nitrogen

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