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Q.

If ovulation is not followed by fertilisation,

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a

menstrual cycles cease 

b

oocyte ejects second polar body  

c

corpus luteum degenerates 

d

endometrium forms placenta  

answer is C.

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Detailed Solution

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If the secondary oocyte is fertilised, the corpus luteum persists (it is rescued from degeneration by hCG) secreted by the placenta. During pregnancy, menstrual cycles cease. Second polar body only if fertilisation occurs. Placenta is not formed in the absence of fertilisation. 
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