Q.How does zona pellucida of ovum help in preventing polyspermy?

Reproductive System Functions – A First Look

Think about what every living thing does, without exception: it reproduces. A mango tree grows from a seed, flowers, and produces more mangoes. A cat gives birth to kittens. You yourself are here because two people, your parents, reproduced. Reproduction is the biological process by which organisms create new individuals of their own kind — it is the reason life continues across generations.

For a commerce or humanities student, the reproductive system is not about complicated diagrams or medical terms. It is about understanding the purpose and basic working of the system that ensures the survival of the human species. The NCERT textbook presents this as a fundamental life process, just like nutrition, respiration, or excretion.

What Does the Reproductive System Do?

The primary function of the reproductive system is to produce offspring. But that simple statement hides a lot of careful design. The system must:

• Produce gametes — the male sperm and the female egg (ovum).
• Transport these gametes so they can meet and fertilise.
• Provide a safe environment for the development of the fertilised egg into a baby.
• Nourish the newborn after birth (through milk production in females).

In humans, reproduction is sexual — it requires two parents, one male and one female. This is different from asexual reproduction (like a bacterium splitting into two), and it introduces genetic variation, which is why brothers and sisters are not identical copies of each other.

The Male Reproductive System – Key Functions

The male system is designed to produce and deliver sperm. The NCERT textbook highlights these main parts and their roles:

• Testes (two oval organs): Produce sperm and the male hormone testosterone. Testosterone is responsible for changes during puberty — deeper voice, facial hair, muscle growth.
• Duct system (epididymis, vas deferens, urethra): Stores sperm and transports it out of the body.
• Accessory glands (seminal vesicles, prostate gland, bulbourethral glands): Add fluids to the sperm to form semen. These fluids nourish the sperm and help them swim.

The entire process is controlled by hormones from the brain (pituitary gland) and the testes themselves.

The Female Reproductive System – Key Functions

The female system is more complex because it must not only produce eggs but also support a growing baby. The NCERT textbook describes these main functions:

• Ovaries (two almond-shaped organs): Produce eggs (ova) and the female hormones oestrogen and progesterone. These hormones regulate the menstrual cycle and prepare the body for pregnancy.
• Fallopian tubes (oviducts): Carry the egg from the ovary to the uterus. Fertilisation (fusion of sperm and egg) usually happens here.
• Uterus (womb): A hollow, muscular organ where the fertilised egg implants and grows into a baby. Its lining thickens each month in preparation for pregnancy.
• Cervix and vagina: The cervix is the lower opening of the uterus; the vagina is the birth canal through which the baby is delivered. …