Q.Males in whom testes fail to descend to the scrotum are generally infertile. Why?

Let’s start with something you already know. Think of your body as a large, complex organisation — a company, a government, or even a school. For everything to run smoothly, there needs to be a communication system that sends instructions from the top to every department. In your body, that communication system is partly run by hormones.

Hormones are chemical messengers. They are released by special glands (like the thyroid, pancreas, or pituitary) and travel through your blood to tell specific organs what to do — when to grow, when to release energy, when to sleep, and so on. As long as every gland releases the right amount of hormone at the right time, your body stays in balance. That balance is called homeostasis.

Now, hormonal regulation failure is simply what happens when that communication system breaks down. It means a gland either releases too much of a hormone, too little, or the target organ stops responding to the hormone properly. The message gets lost, garbled, or never sent.

Why does this matter for a commerce/humanities student?

You don’t need to memorise gland names or chemical pathways. What matters is understanding the consequence: when hormonal regulation fails, the body cannot maintain its internal balance. This leads to specific disorders. The NCERT textbook (Class 11, Chapter 22 – Chemical Coordination and Integration) lists several classic examples. Here are the ones you are most likely to encounter:

• Diabetes Mellitus: The pancreas does not produce enough insulin, or the body’s cells ignore insulin. Insulin is the hormone that tells cells to take in sugar from the blood. Without it, blood sugar rises dangerously. This is the most common example of hormonal regulation failure.
• Hypothyroidism: The thyroid gland produces too little thyroxine. This slows down metabolism — you feel tired, gain weight, and feel cold. In children, it can cause severe developmental delays (cretinism).
• Hyperthyroidism: The opposite — too much thyroxine. Metabolism speeds up uncontrollably: weight loss, rapid heartbeat, sweating, and irritability.
• Gigantism / Acromegaly: Too much growth hormone from the pituitary gland. In children, it causes excessive growth (gigantism). In adults, it causes bones of the hands, feet, and face to enlarge (acromegaly).
• Dwarfism: Too little growth hormone in childhood leads to stunted growth, but normal body proportions.

A simple analogy

Imagine a thermostat connected to an air conditioner. The thermostat senses the room temperature and tells the AC to turn on or off. That’s normal regulation.

Now imagine the thermostat is broken. It keeps telling the AC to run even when the room is freezing — that’s overproduction (hyperthyroidism). Or it never tells the AC to turn on, even when the room is sweltering — that’s underproduction (hypothyroidism). Or the AC itself is broken and ignores the thermostat’s signal — that’s hormone resistance (like in type 2 diabetes).

The room (your body) can’t stay comfortable. That’s hormonal regulation failure.

What causes it?

The NCERT textbook mentions several causes, but for a prose subject, you only need the broad categories:

• Genetic defects – you are born with a gland that doesn’t work properly.
• Autoimmune attacks – the body’s own immune system mistakenly attacks a gland (e.g., Hashimoto’s thyroiditis destroys the thyroid).
• Tumours – a benign growth in a gland can cause it to secrete hormones uncontrollably.
• Nutritional deficiencies – for example, lack of iodine in the diet leads to hypothyroidism (goitre). …