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Practice each question, then open the answer or worked solution.
Which among the following has 23 chromosomes?
Ans: Correct Option is c.
23 chromosomes would mean only one set of chromosomes is present i.e., the cell being asked in question should be diploid. Among the given options, only the secondary oocyte is a haploid structure hence, this is the answer.
Match the following and choose the correct options:
Column I | Column II |
A. Trophoblast | i. Embedding of blastocyst in the endometrium |
B. Cleavage | ii. Group of cells that would differentiate as embryo |
C. Inner cell mass | iii. Outer layer of blastocyst attached to the endometrium |
D. Implantation | iv. Mitotic division of zygote |
Options:
a. A-ii, B-i, C-iii, D-iv
b. A-iii, B-iv, C-ii, D-i
c. A-iii, B-i, C-ii, D-iv
d. A-ii, B-iv, C-iii, D-i
Ans: Correct Option is b.
Trophoblast, the outer layer of cells formed by the cells oriented and organized towards the outermost side of blastocyst, is the layer which helps in fetal implantation and matches with option iii.
Cleavage is just another name for a mitotic division which occurs in a zygote, in a rapid fashion and efficiently. This matches with iv.
Inner cell mass refers to the mass of cells lying inside a blastocyst towards a side which later differentiate to form the embryo and its various parts. This, hence, matches with ii.
Implantation is the process of attachment and embedding of the embryo at blastocyst stage into the uterine endometrium achieved with the help of trophoblast layer. This matches with i.
Which of the following hormones is not secreted by human placenta?
Ans: Correct Option is d.
Human placenta secretes a number of hormones which lead to various changes in the mother but are primarily secreted to maintain pregnancy and develop the embryo. The LH hormone is the one required for follicle maturation and does not play any role in maintaining the pregnancy and hence is not produced by the placenta.
The vas deferens receives duct from the seminal vesicle and opens into urethra as:
Ans: Correct option is b.
The vas deferens collects sperms from epididymis and while travelling towards the urethra receives a duct from the seminal vesicle to form an ejaculatory duct into the urethra.
Urethral meatus refers to the:
Ans: Correct Option is c.
The word meatus means an opening of a canal in any natural body or otherwise, therefore, urethral meatus would mean the opening of the urogenital duct through which both urine and semen pass towards the outside in human males.
Morula is a developmental stage:
Ans: Correct Option is a.
After fertilization, a diploid zygote is formed which undergoes subsequent cleavages to form 2, 4, 8 and then 16 celled stage embryo, the daughter cells of which are known as blastomeres. These divisions are mitotic in nature and occur rapidly dividing the zygote right when it starts moving from oviduct to the uterus. At the 8 celled stage, the embryo is called morula and then it divides to form blastocyst, 18-celled stage. Thus, morula is a developmental stage of embryo between the zygote and the blastocyst.
The membranous cover of the ovum at ovulation is:
Ans: Correct Option is a.
At the time of ovulation, a fully mature graafian follicle is present in the ovary containing an ovum within. This ovum has various layers of covering produced by the surrounding follicular cells or glycoproteins by the ovum itself. The membranous covering however, is the corona radiata produced or secreted by follicular cells.
Identify the odd one from the following:
Ans: Correct Option is a.
The labia minora is a part of external female genitalia and represents the paired folded tissue present beneath the labia majora and surrounds the opening of vagina.
Fimbriae, infundibulum and isthmus are all parts of the oviduct or fallopian tube consisting of the internal parts of the female reproductive system.