Fertilization in Humans
Fertilization in Humans: Overview
This Topic covers sub-topics such as Coitus, Fertilization in Humans, Insemination, Capacitation, Zygote Formation in Human, Cortical Reaction and, Antifertilizin
Important Questions on Fertilization in Humans
Given below are four statements pertaining to fertilization in human beings. Identify the correct statement.
I. Fertilisation can occur if the ovum and the sperms are transported simultaneously to the ampullary region of the Fallopian tube.
II. The secretion of the acrosomes helps the sperm enter the cytoplasm of the ovum.
III. The completion of the meiotic division of the secondary oocyte is induced by the entry of sperms into it.
IV. Hyaluronidase secreted by the acrosomes ensures that only one sperm can fertilise the ovum.
The metabolic activity (s) that takes place after the entry of sperms into the ovum are/is
Some important events that take place during fertilisation are given below. Arrange the events in a proper sequence and select the correct option.
(i) Cortical reaction
(ii) Sperm entry
(iii) Karyogamy
(iv) Acrosomal reaction
Match column I with column II and select the correct option from the codes given below.
| Column I | Column II | ||
| A. | Fertilization | (i) | Isthmus of oviduct |
| B. | Cleavage | (ii) | Later part of oviduct |
| C. | Morula | (iii) | Cervix |
| D. | Blastocyst | (iv) | Ampulla of oviduct |
| E. | Parturition | (v) | Uterine wall |
During the process of fertilization, the sequence of layers crossed by sperm are:
Which of the following statement is incorrect?
Fill in the blanks in the following statement.
For normal fertility, at least ........... percent sperms must have normal shape and size and at least ........ percent of them must show vigorous motility.
In humans, which part of sperm enters into the ovum?
Given below is a structure of an ovum surrounded by few sperms. Choose the correct option w.r.t. the identification of the labelled structures and and the enzymes used to dissolve these structures.
Match the following with correct combination.
| (a) | Hyaluronidase | (i) | acrosomal reaction |
| (b) | Corpus luteum | (ii) | Morphogenetic movements |
| (c) | Gastrulation | (iii) | Progesterone |
| (d) | Capacitation | (iv) | Mammary gland |
| (e) | Colostrum | (v) | Sperm activation |
Which of the following statement about fraternal twins is INCORRECT?
Which enzyme is involved in penetration of sperm into ovum?
The diploid number of chromosomes is restored by the process of
On fusion of egg nucleus with sperm nucleus
Survival time of sperms introduced into the vagina may be
Acrosome facilitates the sperm to
The process of activation of sperm before its penetration into the ovum is,
