Which is the larger-sperm or ovum?

Which of the two, sperm or ovum, decides the sex of the child ?

Sperm Vs Ovum

One of the following is a surgical method which prevents the sperms from reaching the ovum and pregnancy does not occur . This method is :

procedure in which to form an embryo in the laboratory in which a sperm is directly injected into the cytoplasm of ovum

The physiological changes that occur in the sperm, enable it to fertilize the ovum. These changes in the sperm are known as ____________

Assertion : The acrosomal secretions of sperm , help it in entering in the cytoplasm of the ovum . Reason : It contains sperm lysin .

Which of the following layers of the ovum undergoes changes to prevent polyspermy when sperm contacts with it ?