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CDS - Science Test 1440
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CDS - Science Test 1440
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  • Question 1/5
    1 / -0.33
    What is the location of apical meristem in plants?
    Solutions
     The apical meristem, or growing tip, is found in the buds and growing tips of roots in plants.It begins growth of new cells in young seedlings at the tips of roots and shoots (forming buds, among other things). Specifically, an active apical meristem lays down a growing root or shoot behind itself, pushing itself forward. Apical meristems are very small, compared to the cylinder-shaped lateral meristems. Hence, option C is correct.
  • Question 2/5
    1 / -0.33

    Which of the following Statement is not correct about the diamond?

    Solutions

     Diamond is a well-known allotrope of carbon. The hardness, extremely high refractive index, and high dispersion of light make diamond useful for industrial applications and for jewelry. Diamond is the hardest known natural mineral. This makes it an excellent abrasive and makes it hold polish and luster extremely well. No known naturally occurring substance can cut or scratch diamond, except another diamond. In diamond form, carbon is one of the costliest elements. Hence, option D is correct.

     

  • Question 3/5
    1 / -0.33
    Which one of the following pairs of metals is very good conductors of heat?
    Solutions
    Silver is the best conductor of electricity because it contains a higher number of free electrons. For a material to be a good conductor, the electricity passed through it must be able to move the electrons; the more free electrons in a metal, the greater its conductivity. Copper has the second highest thermal conductivity. Hence the correct option is A.

    ADDITIONAL INFORMATION: Most conducting materials used for practical applications are metals. For example, the wire around your house probably uses copper as conducting materials or alloys. The electric plugs have metal in them, and the internal mechanism of your electric irons also uses metals as their conducting material. This is because metals have lots of free electrons and promote mobility. Some of the best metal conductors are Silver (Ag), Copper (Cu) and Gold (Au).

  • Question 4/5
    1 / -0.33
    Which one of the following metals shows less property of malleability?
    Solutions
    Some metals can be beaten into thin sheets. This property is called malleability. Gold, silver, copper, and iron are examples of malleable metals. Hence option D is correct.

    ADDITIONAL INFORMATION: Zinc is neither ductile nor malleable at room temperature. However, at temperatures above 100oC, it becomes somewhat malleable.

  • Question 5/5
    1 / -0.33
    Coconut water and edible part of coconut represent
    Solutions

    It is differentiated into outer thin epicarp, middle fleshy mesocarp, and inner stony endocarp. The edible part of coconut (Cocosnucifera) is endosperm. So the correct option is 'Endosperm'. Hence, option A is correct

    ADDITIONAL INFORMATION:

    It is developed from triploid primary endosperm nucleus which results in vegetative fertilization, a triple fusion of a male gamete with the secondary nucleus of the central cell.

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