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NEET Test 32

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NEET Test 32
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Weekly Quiz Competition
  • Question 1
    4 / -1

    During change of O2 to O2- ion, the electron adds on which one of the following orbital-

    Solution

    in the molecular orbital diagram of O2 molecule, it may be noted that it contains two unpaired electrons in ∏*2px and ∏*2py molecular orbitals. When orbital is changes to O2- the next electron adds in the ∏* orbitals.

     

  • Question 2
    4 / -1

    Which of the following is most acidic?

    Solution

    generally the presence of electron withdrawing group (EWG) increases the acidic character of the carboxylic acids. Higher the number of halogen atoms increases the strength of acid. Hence, trichloroacetic acid has the highest acidity among the given compounds.

     

  • Question 3
    4 / -1

    Which of the following is least effective for flocculation?

    Solution

    Flocculation refers to the process by which fine particulates are caused to clump together. KBr is least effective since bromine ion has least charge as compared to other flocculating ions.

     

  • Question 4
    4 / -1

    Trichoderma harzianum has proved a useful micro-organism for

    Solution

    some fungi which inhabit soil helps to combat diseases caused by soil borne fungi. Species of trichoderma like trichoderma lignorum and gliocladium fimbriatum are found in damp soils. They inhibit the growth of mycellium of pythium. They supress the fungi causing disease to seedlings and therefore helps in to increase the growth of crops.

     

  • Question 5
    4 / -1

    Cry-I endotoxins obtained from Bacillus thuringiensis are elective against

    Solution

    the genetically modified crop plants having cry or Bt toxin genes do not require protection of insecticides as they themselves act as bio insecticides. Some common insects affected by Cry proteins are lepidoterans (tobacco budworm, armyworm), coleopterans (beetals), and dipterans (flies, mosquitoes).

     

  • Question 6
    4 / -1

    In maize, hybrid vigour is exploited by:

    Solution

    Hybrid vigour also known as heterosis or outbreeding enhancement is the improved or increased function of any biological quality in a hybrid offspring. It is done in maize by cross breeding two different pure-bred lines having certain desirable traits.

     

  • Question 7
    4 / -1

    Age of fossils in the past was generally determined by radio-carbon method and other methods involving radioactive elements found in the rocks. More precise methods, which were used recently and led to the revision of the evolutionary period (or different groups of organisms, includes :

    Solution

    Electron Spin Resonance (ESR) is a process which measures the number of charges occupying deep traps in crystal band gap. The basic principle of ESR is same as those for luminescence when electrons become trapped and are stored as a result of ionizing radiations for e.g., Dating of tooth enamel.

     

  • Question 8
    4 / -1

    During replication of a bacterial chromosome DNA synthesis starts from a replication origin site and :

    Solution

    The events for initiation of DNA replication in prokaryotes may be given as follows 
    (a) pre-priming (occurring only at the origin); 
    (b) priming (recurring with the initiation of each okazaki fragment during elongation phase. 
    Unwinding of DNA is followed by the synthesis of RNA primers by RNA primase.

     

  • Question 9
    4 / -1

    You are required to draw blood from a patient and to keep it in a test tube for analysis of blood corpuscles and plasma. You are also provided with the following four types of test tubes. Which of them will you not use for the propose?

    Solution

    Clotting of blood can be prevented by coating the test tubes with silicon or adding chelating agents.Heparin, citrate and EDTA are anti-coagulants.

     

  • Question 10
    4 / -1

    In the resting state of the neural membrane, diffusion due to concentration gradients, if allowed, would drive :

    Solution

    In the resting state of neural membrane, the cytoplasm inside the axon has a high concentration of K+ and a low concentration of Na+thus if diffusion occurs against concentration gradient Na+ enters the cell.

     

  • Question 11
    4 / -1

    Which of the following does not affect glomerular filtration?

    Solution

    Glomerular filtration depends on three main types of pressure. One pressure, the glomerular blood hydrostatic pressure, promotes the process of filtration. The other two pressures, the capsular hydrostatic pressure and the blood colloid osmotic pressure, that opposes filtration.

     

  • Question 12
    4 / -1

    Which of the following is incorrectly matched?

    Solution

    Gills are present in fishes and aquatic animals. They are used to remove carbondioxide in the aquatic animals. They also excrete salt in many bony fishes.

     

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