How can plants prevent self poll​ination?
​(a) stamin and pistil nature at different times.
(b) plants should develop bisexual flowers
​(c) pistil should have increased receptivity for pollens from same plant
(d) all of these.

soon give the answer 

Dear Student, 

Correct answer is Option (d) All of the above.
To prevent Self Pollination , In some plants the Stamen and Pistil mature at different time 
While other plants may develop bisexual flowers . Also Pollen Pistil receptivity is also a measure of preventing self pollination.

Regards!

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b !s c0rrect
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