Reaching the Age of Adolescence — Question 6
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What are sex hormones? Why are they named so? State their function.
Hormones released from sex organs are referred as sex hormones. They are named so because they affect the sexual organs and characters.
The sex hormones and their functions are as follows :
- Male sex hormone is Testosterone released from testis. Testosterone induces puberty-related physical changes, including increased muscle, face, pubic, and body hair growth, voice deepening, and sexual and reproductive development.
- Female sex hormone is estrogen which is released from ovary. It plays role in maintenance of menstrual cycle, development of breast.
Chapter Overview: Reaching the Age of Adolescence
This chapter covers the physical and emotional changes during adolescence and puberty, the role of hormones secreted by endocrine glands, sex determination in humans (XX/XY), and the importance of balanced nutrition, personal hygiene, and avoiding harmful substances during this critical growth period.
Board Exam Weightage: 4-6 marks | Difficulty: Moderate
Key Formulas & Concepts
| Concept | Details |
|---|---|
| Sex Determination | XX = Female; XY = Male; Father's sperm determines sex |
| Thyroxine | Thyroid hormone; controls metabolism; needs iodine; deficiency → goitre |
| Insulin | Pancreatic hormone; controls blood sugar; deficiency → diabetes |
| Puberty Age | Girls: ~11 years; Boys: ~13 years (approximate onset) |
Must-Know Concepts
- Adolescence spans ages 11-19; puberty is the onset of reproductive maturity within this period
- Secondary sexual characters: visible physical changes at puberty (facial hair in boys, breast development in girls)
- Adam's apple is the enlarged voice box in boys (causes deeper voice)
- Pituitary is the master gland (controls other endocrine glands)
- Sex is determined by the father's sperm (X → girl, Y → boy), not by the mother
- Balanced diet, exercise, hygiene, and avoiding drugs are essential during adolescence
Endocrine Glands and Hormones
| Gland | Hormone | Function |
|---|---|---|
| Pituitary (brain) | Growth hormone | Controls body growth; master gland |
| Thyroid (neck) | Thyroxine | Controls metabolism; needs iodine |
| Pancreas (abdomen) | Insulin | Regulates blood sugar |
| Adrenal (on kidneys) | Adrenaline | Fight or flight response |
| Testes (males) | Testosterone | Male sexual characters, sperm production |
| Ovaries (females) | Oestrogen | Female sexual characters, egg development |
Common Mistakes to Avoid
- Thinking the mother determines the sex of the child (father's sperm determines it)
- Confusing adolescence (age period) with puberty (onset of changes)
- Mixing up endocrine (ductless, hormones into blood) and exocrine (duct) glands
- Thinking hormones act instantly like nerve impulses (they are slower)
Scoring Tips
- Draw the XX/XY cross diagram to explain sex determination
- Create a hormone-gland-function table for quick revision
- Learn physical changes during puberty for both boys and girls
- Connect hormonal disorders to glands: goitre → thyroid, diabetes → pancreas
Frequently Asked Questions
Q: How many marks does this chapter carry in the exam?
A: Approximately 4-6 marks in the annual exam.
Q: What question types are commonly asked?
A: MCQs (1 mark), Very Short Answer (2 marks), Short Answer (3 marks), and Long Answer / Diagram (5 marks).
Q: Is this chapter important for competitive exams?
A: Yes, concepts from this chapter appear in NTSE, Olympiad, and other science competitions.