4th Class Science Plants Question Bank Plants

  • question_answer 20)
    The diagram below shows how a green leaf would look under red light, blue light and green light.
     
    Select the correct inference drawn from this.
                  

    A)        

    Coloured light Absorbed by the leaf Reflected by the leaf Used by the leaf for photosynthesis
    Red light  
                   

    B)

    Coloured light Absorbed by the leaf Reflected by the leaf Used by the leaf for photosynthesis
    Blue light
                   

    C)

    Coloured light Absorbed by the leaf Reflected by the leaf Used by the leaf for photosynthesis
    Red and blue light  
                   

    D)

    Coloured light Absorbed by the leaf Reflected by the leaf Used by the leaf for photosynthesis
    Green light  

    Correct Answer: C

    Solution :

    The coloured objects that we see around us are due to the reflection of those colours by these objects e.g., leaf appears green due to reflection of green light by it. Leaf appears black under red and blue light because both these colours get absorbed by the leaf. Also, red and blue light are the most efficient lights for photosynthesis and thus, they are used up by the leaves for this process, green light is not used up in the photosynthesis.                

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