Assertion : The nucleus of sperm fuses with the nucleus of ovum , before the formation of ootid .
Reason : Diploid nuclear status of organism is essential for its development .

Read the following text and answer the following questions on the basis of the same: During sexual reproduction, the male inserts the sperm into the female reproductive tract, and sperm receive by the ovary and after that sperm fuse with the egg (ovum) in the ampullary region, this process is called fertilization, haploid nucleus of sperm fuse with that of ovum to form Diploid zygote. Assertion (A): All copulations do not lead to the fertilisation and pregnancy. Reason (R): Fertilisation can occur only if the ovum and sperms are transported simultaneously to the ampulllary-isthmic junction.

Assertion : Hydrogen is the simplest atom Reason : Its nucleus contains only two protons

Read the following text and answer the following questions on the basis of the same: During sexual reproduction, the male inserts the sperm into the female reproductive tract, and sperm receive by the ovary and after that sperm fuse with the egg (ovum) in the ampullary region, this process is called fertilization, haploid nucleus of sperm fuse with that of ovum to form Diploid zygote. The phenomenon of sperm activation in mammals is known as.

Assertion; Amitosis occurs with spindle formation. Reason;Amitosis occurs during the formation of gametes in diploid organisms.

Assertion : The nuclear isomers are the atoms with the same atomic number and same mass number, but with different radionctive properties. Reason : The nucleus in the excited state will evidently have a different half-life as compared to that in the ground state.

Assertion (A) : The nucleus of gold is stable even though there is a very strong coulombic repulsion among the protons. Reason (R) : The inverse square coulomb force is exactly balanced by another inverse square force which is very powerful. i.e., nuclear force.