millions of sperms are produced in male but one or two ova in female. why? ans for 100 points ...
Answers
BECAUSE SPERM OF IS VERY SMALL AND THEY PRODUCE HALF GLASS SPERM AND FEMALE PRODUCE FULL GLASS .
To achieve fertilisation, a sperm must travel up the oviducts and then do far more than just run into an egg. This is because the egg arrives in the oviducts surrounded by a triplicate coat of armour.
The sperm cells literally have to fight their way through the three layers, first using chemicals contained in their acrosome, and then using a spike on their head to puncture a hole as the sperm forces its way forward by thrashing its tail.
Finally, should one sperm cell get this far and make contact with the egg membrane, it is engulfed and can then go about fertilisation: all other sperm cells reaching the egg are then repelled.
This is because once a single sperm has penetrated the three lines of defence, the egg passes a chemical message across its surface making it impenetrable. Of the 40 to 300 hundred million sperm produced by the male, only one gets to do its job.
in short aur of millions of sperms only one can be able to reach the ova perform the fertilization so sperms are required in more numbers then ovums