Human Reproduction

Answer (c) They provide nutrition to developing sperm; they direct morphogenesis of sperm

Answer (c) Trophoblast, mesoderm and allantois

Answer (a) Hypothalamus ?

The correct answer is option (B): Zona pellucida
A crucial component of effective fertilization is the zona pellucida. During the period of oogenesis, it connects follicular cells and oocytes by existing between them. Embryos and oocytes are shielded during development. It starts the acrosome reaction, which allows sperm cells to attach and penetrate. It aids in avoiding polygamy. The acrosome reaction is triggered by the binding of zona pellucida glycoprotein It aids in species-specific fertilization and avoids interspecific breeding. It controls how free-swimming sperms and ovulated eggs or secondary oocytes interact. Immunocontraception targets sperm-binding proteins. Infertility affects the mutant females devoid of the zona pellucida layer covering fertilization of the egg.

The correct answer is option (C): Rete testis → Vasa efferentia → Epididymis → Vas deferens
The testis, epididymis, urethra, vas deferens, prostate gland, seminal vesicle, and penis are the primary male reproductive organs. Seminiferous tubules, which are made up of coil-like structures and serve as sperm production sites, make up the testis. the part of the epididymis that sits atop the seminiferous tubules. The seminiferous tubules and the epididymis are where the sperm travel. These structures serve as sperm storage till ejaculation. The sperm are ejaculated in the female vagina during sexual contact, and that is when their trip begins. With the aid of fertile cervical mucus, the sperm travels through the cervix and eventually enters the uterus. So, the correct sequence is Rete testis→ Vasa efferentia→ Epididymis→ Vas deferen.

Step 1: Understanding the Question.
The question asks about MTP and its legal status in India. We need to identify which statement about MTP is false.

Step 2: Analyzing the Options.
(A) MTPs have become a legal issue in many countries: This is true as MTP laws vary across countries and are often debated.
(B) India passed a law for MTP in 1971: This is true, as the Medical Termination of Pregnancy Act was passed in India in 1971.
(C) MTPs are safe if performed before 12 weeks of pregnancy: This is true, as it is a generally accepted medical practice.
(D) None of the above: Correct — All the statements in (A), (B), and (C) are true, so "None of the above" is the correct answer.

Step 3: Conclusion.
The correct answer is (D) None of the above, as all the statements about MTP are true.

Step 1: Understanding the Question.
The question asks which hormone is used to stimulate the uterus during pregnancy when normal data compression does not occur.

Step 2: Analyzing the Options.
(A) Progesterone: This hormone helps maintain pregnancy, but it does not induce uterine contractions.
(B) Relaxin: This hormone helps relax the uterus, but it doesn't induce labor.
(C) Oxytocin: Correct — Oxytocin stimulates uterine contractions during labor and is often injected to initiate or stimulate labor.
(D) Vasopressin: This hormone regulates water balance but does not play a direct role in pregnancy stimulation.

Step 3: Conclusion.
The correct answer is (C) Oxytocin, as it stimulates uterine contractions and is used to induce labor.

Step 1: Understanding the Question.
This question asks which hormone plays a role in stimulating the secretion of substances in the male reproductive system, particularly those related to sperm production.

Step 2: Analyzing the Options.
(A) FSH: Follicle-stimulating hormone (FSH) does play a role in sperm production, but it is not primarily responsible for secretion.
(B) LH: Correct — Luteinizing hormone (LH) stimulates testosterone production, which is crucial for sperm maturation and other male reproductive functions.
(C) Progesterone: This hormone is important in female reproduction but does not play a significant role in the male reproductive system.
(D) Both (A) and (C): This is incorrect as progesterone is not involved in male reproductive functions.

Step 3: Conclusion.
The correct answer is (B) LH, as it is the hormone responsible for stimulating testosterone secretion in males.

Step 1: Understanding the Question.
The diagram shows a structure in the male reproductive system. The task is to identify the structure and the number of cells represented.

Step 2: Analyzing the Options.
(A) Sertoli cells, 23: Correct — Sertoli cells are crucial in supporting the development of sperm and are often depicted in diagrams of the seminiferous tubules.
(B) Primary sperm cells, 46: This is incorrect because primary sperm cells typically have 46 chromosomes but are not directly related to the question's context.
(C) Spermatocytes, 23: Spermatocytes are involved in spermatogenesis but are not the primary structure of focus here.
(D) Sertoli cells, 46: Incorrect, as Sertoli cells support the sperm but the number of chromosomes in sperm is different.

Step 3: Conclusion.
The correct answer is (A) Sertoli cells, 23, as this best fits the description of the diagram.