Assertion : There is generally monospermy in most of animals.
Reason : Vitelline membrane of ovum checks polyspermy.
Assertion : Penetration of sperm into ovum is a chemical process.
Reason : Acrosome of sperm secretes a lytic enzyme hyaluronidase which dissolves vitelline membrane of ovum.
Assertion : Cleavage is also called fractionating process.
Reason : In cleavage, number of blastomeres increases but size of blastomears decreases.
Assertion : Nuclear-cytoplasmic ratio decreases in cleavage.
Reason : During cleavage, cytoplasmic synthesis is faster than DNA synthesis.
Assertion : Implantation is the process of attachment of blastocyst on uterine endometrium.
Reason : Implantation is controlled by trophoblast and occurs by decidual cell reaction.
Assertion : Gastrular movements are morphogenetic.
Reason : During gastrulation, cells move in masses and towards definite direction.
Assertion : Asexual reproduction is also called blastogenesis.
Reason : In asexual reproduction, there is no fusion of gametes.
Assertion : Sexual reproduction is advantageous than asexual reproduction.
Reason : It is rapid mode of reproduction while asexual reproduction is slow mode of reproduction.
Assertion : In human male, testes are extra-abdominal and lie in scrotal sacs.
Reason : Scrotum acts as thermoregulator and keeps testicular temperature lower by 2°C normal spermatogenesis.
Assertion : Urethra in human male acts as urinogenital canal.
Reason : Urethra carries only urine while sperms are carried by vasa deferentia only.