Life Science Mock Test CSIR NET Exam - Part 3

This Quiz is posted with the sole aim of guiding the aspirants of CSIR-NET Exam to the path of success. To sharpen the edges of your own intelligence and practice, in a structured and concrete manner to ensure you definite Success in your endeavor and will Pave your way for a successful career in Teaching (or) Research Profession . All the very best...... Knock the door of success......

1. 
   Which of the following is an example of numerical change in chromosome number?
   
   
   
   
   1.  Parkinson's disease
   
   
   2.  Xeroderma pigmentosum
   
   
   3.  Progeria syndrome
   
   
   4.  Down's syndrome
   
   
   
   
   
   
   
   
   


2. 
   Chlorophyll is an effective photoreceptor pigment. This property of chlorophyll is due to ________.
   
   
   
   
   1.  Nitrogen in chlorophyll
   
   
   2.  Presence of accessory pigment
   
   
   3.  Magnesium in chlorophyll
   
   
   4.  Presence of polyene structure
   
   
   
   
   
   
   
   
   


3. 
   Febries are what kind of cells ?
   
   
   
   
   1.  Sclerenchymatous
   
   
   2.  Parenchymatous
   
   
   3.  Chloroplast
   
   
   4.  Collenchymatous
   
   
   
   
   
   
   
   
   


4. 
   Polypeptides can be fragmented by using chemical treatment before amino acid sequencing of a given protein. Cyanogen bromide is one such reagent and its specific cleavage site is ________.
   
   
   
   
   1.  Carboxyl side of ‘arginine residues’
   
   
   2.  Carboxyl side of aspartate and glutamate residues
   
   
   3.  Carboxyl side of lysine and arginine residues
   
   
   4.  Carboxyl side of methionine residues
   
   
   
   
   
   
   
   
   


5. 
   During a growth curve of Aliivibrio fischeri, when would you expect to see the strongest bioluminescence?
   
   
   
   
   1.  Lag phase
   
   
   2.  Middle to late stationary phase
   
   
   3.  Early to middle log phase
   
   
   4.  Late log to early stationary phase
   
   
   
   
   
   
   
   
   


6. 
   Maximum biodiversity occurs at ___________.
   
   
   
   
   1.  Equator
   
   
   2.  Temperate 
   
   
   3.  Shooth
   
   
   4.  Tropics
   
   
   
   
   
   
   
   
   


7. 
   Deepest enriched soil with nutrients is present at _____________.
   
   
   
   
   1.  Grasslands
   
   
   2.  Dry deciduous forests
   
   
   3.  Conifers
   
   
   4.  Tropical rain forests 
   
   
   
   
   
   
   
   
   


8. 
   Each organism occupies a particular trophical level in a food chain. Moving from one trophical level to the next involves an energy loss of about ___________.
   
   
   
   
   1.  20%
   
   
   2.  10%
   
   
   3.  30%
   
   
   4.  12%
   
   
   
   
   
   
   
   
   


9. 
   Benthic organism of lakes or sea are usually ______.
   
   
   
   
   1.   Carnivores
   
   
   2.  Decomposers
   
   
   3.  Herbivores
   
   
   4.  Producer
   
   
   
   
   
   
   
   
   


10. 
    Profitability of prey for predator lies in its energy content and ______________.
    
    
    
    
    1.  Prey density
    
    
    2.  Foraging time
    
    
    3.  prey availability
    
    
    4.  Palatability
    
    
    
    
    
    
    
    
    

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