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BIOLOGY MCQs

Total Questions : 2561 | Page 3 of 257 pages
Question 21. Primary phloem develops from
  1.    lateral meristem
  2.    protoderm
  3.    extrastelar cambium
  4.    provascular tissue
 Discuss Question
Answer: Option D. -> provascular tissue
Question 22. Other than spreading malaria, anopheles mosquitoes are also vectors of
  1.    dengue fever
  2.    filariasis
  3.    encephalitis
  4.    yellow fever
 Discuss Question
Answer: Option B. -> filariasis
Question 23. Pyorrhoea is a disease of the
  1.    nose
  2.    gums
  3.    heart
  4.    lungs
 Discuss Question
Answer: Option B. -> gums
Question 24. Plants that grow in saline water are called
  1.    halophytes
  2.    hydrophytes
  3.    mesophytes
  4.    thallophytes
 Discuss Question
Answer: Option A. -> halophytes
Question 25. O2 released in the process of photosynthesis comes from
  1.    CO2
  2.    water
  3.    sugar
  4.    pyruvic acid
 Discuss Question
Answer: Option B. -> water
Question 26. Placenta is the structure formed
  1.    by the union of foetal and uterine tissue
  2.    by foetus only
  3.    by fusion of germ layers
  4.    None of these
 Discuss Question
Answer: Option A. -> by the union of foetal and uterine tissue
Question 27. Plants hormone that induces cell division is
  1.    auxins
  2.    gibberellins
  3.    kinins
  4.    domins
 Discuss Question
Answer: Option B. -> gibberellins
Question 28. Neurospora is used as genetic material because
  1.    it has short life cycle of 10 days
  2.    the product of single meiosis can be easily analysed
  3.    meiotic products are linearly arranged in the form of ordered tetrads
  4.    is a diploid fungus
 Discuss Question
Answer: Option A. -> it has short life cycle of 10 days
Question 29. Phloem is a tissue found in
  1.    reproductive organs of animals
  2.    plants
  3.    insects
  4.    mammals
 Discuss Question
Answer: Option B. -> plants
Question 30. N2 content is kept constant in the biosphere due to
  1.    N2 fixation
  2.    industrial pollution
  3.    nitrogen cycle
  4.    absorption of N2
 Discuss Question
Answer: Option C. -> nitrogen cycle

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