Q10 of 23 Page 8

What is placenta? Describe its structure. State its functions in case of a pregnant human female. ( CBSE 2016, 2013, 2012, 2011)

After zygote implantation, there is a development of a disc like tissue known as Placenta which connects the mother and the Foetus through umbilical cord. The embryo gets nourishment inside the mother’s body by a disc-like tissue placenta which gets developed between the uterus wall and the embryo during the implantation. The nutrients, Oxygen and waste products are exchanged through this tissue.

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how does growing embryo gets nutrition from the mother's blood? (CBSE 2012, 2011)

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Explain the process of regeneration in Planaria.
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Reproduction is linked to stability of population of a species. Justify the statement. 
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