National Science Olympiad Forum By SOF Olympiad Trainer - Page 3

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Subject :NSO    Class : Class 9

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Subject :NSO    Class : Class 9

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Subject :NSO    Class : Class 10

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Subject :NSO    Class : Class 5

Aquarium keepers are typically advised to remove dead fish from an aquarium the moment they are discovered. Otherwise, the water may soon become cloudy due to a bacterial bloom. Which of the following best explains why a bacterial bloom should be avoided?

A The bacteria acting on the dead organism may 1 infect other fish and aquatic organisms, causing an aquarium plague.
B The cloudiness in the tank prevents the fish keepers from properly observing their pets.
C The bacteria may become airborne with the evaporation of water from the aquarium and cause diseases in the external environment.
D The sudden spike in bacterial population may result in insufficient dissolved oxygen for the other aquatic organisms, causing more aquatic life to die.


It should be option A.

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Subject :NSO    Class : Class 6

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Subject :NSO    Class : Class 6

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Subject :NSO    Class : Class 8

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Subject :NSO    Class : Class 3

Which of the following CANNOT be found in the given crossword?


AA hard rock used for making kitchen counters
BA type of soil which has very fine particles and has very little space for air between its particles
CLightest rock used for polishing teeth by dentists
DA precious mineral used in jewellery


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Ans 1:

Class : Class 3

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Subject :NSO    Class : Class 4

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Subject :NSO    Class : Class 9

Which of the following statements is/are incorrect regarding lysosomes?
(i) Lysosomes are small vesicles which are bounded by a single membrane.
(ii) Lysosomes occur in all animal cells with the exception of red blood cells.
(iii) Lysosomes are called suicide bags because they contain hydrolytic enzymes.
(iv) The acidic conditions are maintained inside the lysosomes by pumping Na+ and K+ ions.

A(i) and (ii) only
B(ii), (iii) and (iv) only
C(iii) only
D(iv) only


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