The enzymes that dissolve the membrane enveloping the ovum and help sperm to enter the
(a.)Sperm lysins
(b.) Inhibin
(c.)Both a and b
(d.)Spectrin

Which of the following statements regarding fertilization is/are correct ? (i) The acrosome is filled with hydrolytic enzymes which help in dissolving the membrane of the ovum at the time of fertilization. (ii) Vitelline membrane is the first membrane to be faced by sperms while trying to fuse with the ovum . (iii) There must be synchronicity in the release of ovum and entry of sperm for the formation of zygote . (iv) The meiotic division of the secondary oocyte is concluded with the entry of male gamete.

What is name of enzyme produced in sperm to help it to enter the ovum?

(a) Name the hormone that initiates spermatogenesis in humans. Describe the process of spermatogenesis in spermatogenesis in sequence mentioning the ploidy of the cells at each step. (b) Draw the diagram of a mature human sperm and label the parts that : (i) helps it reaching to the ovum . (ii) providing energy for it to reach the ovum. (iii) helping it to gain entry into the ovum.

Natural methods of contraception work on the principle of avoiding chances of ovum and sperm meeting. It includes (A) Periodic abstinence (B) Withdrawl (C ) Coitus interrupts (D) Lactational ammenorrhoea

Name the functions of the following. (a) Corpus luteum (b) Endometrium (c) Acrosome (d) Sperm tail (e) Fimbriae

Read the following information carefully and answer the questions given below: (i) There are five types of cards viz. A,B,C,D and E. There are three cards of each type. These are to be inserted in envelopes of three colours -Red, Yellow and Brown. There are five envelopes of each colour. (ii) B, D and E type cards are inserted in red envelopes A, B and C type cards are to be inserted in yellow envelopes and C, D and E type cards are to be inserted in brown envelopes. (iii) Two cards each of B and D type are inserted in red envelopes. Which of the following combinations of colour of the envelope and the number of cards is definitely correct in respect of E-type cards?