Who demonstrated the acrosome reaction in Saccoglossus?

Assertion: Holoblastic cleavage with almost equal-sized blastomeres is a characteristic of placental animals.
Reason: Eggs of most mammals,including humans,are of centrolecithal type.

If the first cleavage furrow divides the zygote completely into two,the cleavage type is

What triggers the acrosome reaction in a sperm?

Give scientific reasons: Enzymes are secreted from the cells of trophoblast.

Where does the formation of the zygote occur during fertilization in rabbits?