How is the entry of only one sperm and not many ensured into an ovum during fertilisation in humans?

Which event ensures that only one sperm can fertilize an ovum ?

First step in activation of ovum during process of fertilisation is

Stage of sperm before entry into ovum/s prefertilisation process is

Describe the events that take place from the time of entry of the human sperm into the ovum till fertilisation is complete.

Describe the physico-chemical events that take place during fertilisation in humans.

Describe the physico-chemical events that take place during fertilisation in humans.

The entry of additional sperms into the ovum is prevented because of

If sperms of moss and fern are put together near the archegonium of fern, only the sperms of fern find entry into archeogonium, the reason being that

which of the following statements regarding fertilization and implantation are incorrect ? I. During fertilization , a sperm first comes in contact with the corona radiata cells produced by the ovum. II. Fertilization occurs only if sperm and ovum are simultaneously transported to the ampullary region. III. Implantation occurs about 7 days after fertilization . IV. The continuous division of morula leads to the formation of zygote.

How many bones are present in human palm?