All questions of November for NEET Exam

The seminal vesicles are responsible for generating fluid rich in fructose, calcium, and certain enzymes. This fluid, known as seminal plasma, nourishes the sperm and constitutes the majority of the volume of semen. It provides important nutrients to support sperm function.

The penis becomes rigid when its erectile tissue, consisting of the corpora cavernosa and corpus spongiosum, is filled with blood during sexual arousal. This rigidity facilitates sexual intercourse and insemination.

Spermatogenesis Overview
Spermatogenesis is the biological process through which sperm cells are produced in the male reproductive system. This process is crucial for male fertility and occurs in a specific location within the testes.
Location of Spermatogenesis
- Seminiferous Tubules:
- Spermatogenesis primarily occurs in the seminiferous tubules, which are coiled structures located within the testes.
- These tubules are lined with germinal epithelium where sperm cells develop from spermatogonia (the stem cells).
Stages of Spermatogenesis
- Spermatogonia:
- The process begins with spermatogonia, which undergo mitosis to produce primary spermatocytes.
- Meiosis:
- Primary spermatocytes undergo meiosis to form secondary spermatocytes, which further divide to produce spermatids.
- Spermiogenesis:
- Spermatids undergo a transformation called spermiogenesis, where they mature into spermatozoa (mature sperm).
Other Structures in Male Reproductive System
- Epididymis:
- While the epididymis is crucial for the maturation and storage of sperm, it is not where sperm are produced.
- Seminal Vesicles and Vas Deferens:
- These structures play roles in the transportation and nourishment of sperm but do not participate in their production.
Conclusion
In summary, spermatogenesis occurs exclusively in the seminiferous tubules of the testes, making option 'D' the correct answer. Understanding this process is fundamental for comprehending male reproductive biology, particularly for examinations like NEET.

The male accessory glands, including the seminal vesicles, prostate, and bulbourethral glands, generate fluid that nourishes sperm. This fluid, known as seminal plasma, contains nutrients like fructose, calcium, and enzymes and constitutes a significant portion of semen.

The primary function of the prostate gland in the male reproductive system is to generate fluid that nourishes sperm. The prostatic fluid, when combined with seminal plasma from the seminal vesicles and other secretions, forms semen, which carries and nourishes sperm during ejaculation.

Contraceptive Methods Involving Hormones
Contraceptive methods can be broadly categorized based on their mechanisms of action. Among the options provided, the methods that involve hormones are crucial for regulating reproductive functions.
Pills
- Oral Contraceptives: Birth control pills contain synthetic hormones (estrogen and progestin) that prevent ovulation.
- Mechanism: They inhibit the release of eggs from the ovaries and thicken cervical mucus to prevent sperm entry.
Emergency Contraceptives
- Hormonal Options: Emergency contraceptive pills (ECPs) primarily contain hormones like levonorgestrel or ulipristal acetate.
- Function: These hormones delay ovulation and may prevent fertilization or implantation if taken within a specific time after unprotected intercourse.
Lactational Amenorrhea
- Hormonal Influence: This method relies on breastfeeding's hormonal effects, particularly prolactin, which suppresses ovulation.
- Effectiveness: While not a hormonal method in the same sense as pills, it relies on the natural hormonal changes induced by lactation to prevent pregnancy.
Conclusion
The correct answer is option 'B' because it includes methods that directly involve hormonal regulation to prevent pregnancy, specifically through pills and emergency contraceptives, along with the lactational amenorrhea method influenced by hormonal changes during breastfeeding. Other options, such as barrier methods, do not involve hormones.