With age the skin loses its ability to retain water, the elasticity of the collagen fibres decreases, thus the skin cannot does not remain tight and wrinkles.Â
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17.
Answer in brief :
Which part of soil water is available to plants for absorption by roots?
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18.
Answer in brief :
What makes the apical meristem of the root sub-terminal?
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19.
Answer in brief :
Name the enzyme which catalyses bicarbonate formation in RBCs.
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20.
Answer in brief:
Which form of phytochrome induces flowering in SDP?