Biology - 03

01. Potato is a modified form (outgrowth) of:

  • 1root
  • 2stem
  • 3fruit
  • 4leaf
Answer:- 1
Explanation:-

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02. out of proteins, lipids and carbohydrates present in a cell membrane, what is true?

  • 1Lipids are maximum
  • 2Carbohydrates are minimum
  • 3Carbohydrates are maximum
  • 4All three are in equal proportion
Answer:- 1
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03. N2 content is kept constant in the biosphere due to

  • 1N2 fixation
  • 2industrial pollution
  • 3nitrogen cycle
  • 4absorption of N2
Answer:- 1
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04. Neurospora is used as genetic material because

  • 1it has short life cycle of 10 days
  • 2the product of single meiosis can be easily analysed
  • 3meiotic products are linearly arranged in the form of ordered tetrads
  • 4is a diploid fungus
Answer:- 1
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05. Plants hormone that induces cell division is

  • 1auxins
  • 2gibberellins
  • 3kinins
  • 4domins
Answer:- 1
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06. Placenta is the structure formed

  • 1by the union of foetal and uterine tissue
  • 2by foetus only
  • 3by fusion of germ layers
  • 4None of these
Answer:- 1
Explanation:-

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07. O2 released in the process of photosynthesis comes from

  • 1CO2
  • 2water
  • 3sugar
  • 4pyruvic acid
Answer:- 1
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08. Plants that grow in saline water are called

  • 1halophytes
  • 2hydrophytes
  • 3mesophytes
  • 4thallophytes
Answer:- 1
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09. Other than spreading malaria, anopheles mosquitoes are also vectors of

  • 1dengue fever
  • 2filariasis
  • 3encephalitis
  • 4yellow fever
Answer:- 1
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10. Primary phloem develops from

  • 1lateral meristem
  • 2protoderm
  • 3extrastelar cambium
  • 4provascular tissue
Answer:- 1
Explanation:-

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