CLASS 7 SCIENCE · CHAPTER 6 · STUDY NOTES
Adolescence: A Stage of Growth and Change
Understand growing-up changes with clear science, respect, practical care and support.
01 / EXPLORE & UNDERSTAND
Growing up is a gradual journey
People of the same age do not all develop at the same pace.
1. See the whole journey
Infancy, childhood, adolescence, adulthood and old age describe broad stages of life. Adolescence includes growth of the body, new feelings, developing relationships and learning to make more independent decisions.
2. Avoid turning ages into deadlines
The age range describes a stage; it is not a timetable that every body must follow exactly. Two classmates may notice changes at different times. Comparing, teasing or ranking bodies does not help anyone understand healthy growth.
Your turn
Question
Why can two classmates of the same age have different growth patterns?
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02 / EXPLORE & UNDERSTAND
Puberty is one part of adolescence
Body changes and the whole experience of growing up are related, but not identical.
1. Include changes inside the body
Some changes, such as height and hair growth, can be noticed outside. Reproductive organs also mature inside the body. Puberty includes both kinds of change; it is not only a change in appearance.
2. Separate body development from adult readiness
Being physically capable of reproduction does not make a child ready for pregnancy, marriage or adult responsibilities. Adolescents still need education, care, safety and time to grow. Physical development does not remove those needs.
Your turn
Question
Does puberty describe every emotional and social change of adolescence?
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03 / EXPLORE & UNDERSTAND
Height, body shape and hair can change
Learn the common patterns without judging anyone’s body.
1. Recognise the examples in the book
A growth spurt means a faster increase in height over a period. Body weight and proportions also change. The chapter describes broader shoulders and facial hair as common male puberty changes, and breast development as a common female puberty change.
2. Notice variation and shared changes
Underarm and pubic hair commonly develop across puberty patterns. The amount of hair and the timing of changes vary. These examples are for understanding development, not for inspecting classmates or deciding someone’s identity from their appearance.
Your turn
Question
Why is teasing someone about earlier or later body changes scientifically unfair?
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04 / EXPLORE & UNDERSTAND
The growing voice box changes the voice
The sound-making structure grows too.
Where the voice is made
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1. Connect the structure with the sound
As the voice box grows, the vocal folds change. The voice may deepen or sometimes crack during the change. Growth is generally more pronounced in male puberty, but voice changes and the visible throat bump vary among people.
2. Name the bump correctly
The Adam’s apple is a visible prominence of cartilage around the voice box. It is not a separate organ appearing in the neck. An unfamiliar swelling should not be diagnosed from a picture; a trusted adult can help arrange a health check.
Your turn
Question
Is the Adam’s apple a new organ unrelated to the voice box?
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05 / EXPLORE & UNDERSTAND
Skin changes are not a reason for shame
Pimples are common during adolescence.
1. Follow the change in oil production
Hormonal changes can increase skin oil. Oil and dead skin cells can block pores, contributing to acne. Pimples are not proof that someone is dirty or has done something wrong.
2. Choose gentle care and support
Regular gentle washing and clean clothing are part of everyday hygiene. Picking pimples can irritate skin. If acne is painful, persistent or upsetting, ask a trusted adult or healthcare professional for help instead of copying treatments from advertisements.
Your turn
Question
Why should a classmate with acne not be blamed for it?
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06 / EXPLORE & UNDERSTAND
Menstruation is a natural body process
A period is part of a cycle, not a sign of impurity.
1. Understand what changes inside
Hormones help the uterus prepare a lining during the menstrual cycle. If pregnancy does not begin, the lining is shed as a period. The first period is called menarche. Menstruation is not an illness and does not make someone unclean.
2. Use a cycle as a guide, not a strict clock
A cycle is counted from the first day of one period to the first day of the next. The book gives an approximate monthly pattern, but early adolescent cycles can vary. Do not teach that everyone must bleed exactly every 28 days.
A little deeper: Variation does not mean concerns should be ignored
Many teenage cycles are 21–45 days, rather than the narrower adult range often quoted. A trusted adult and healthcare professional can help with severe pain, heavy bleeding or worrying changes. Menopause is the later life stage when periods end naturally; the chapter gives an approximate range, not an individual prediction.
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Question
Do people need to be isolated from others because they are menstruating?
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07 / EXPLORE & UNDERSTAND
Comfort, privacy and clean facilities matter
Menstrual care is a practical need, not something to hide in shame.
A pad absorbs menstrual flow
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1. Connect products with facilities
Suitable pads or properly cleaned reusable menstrual products help manage bleeding. Follow the product’s instructions and change it regularly. Clean water, soap, a private toilet and a place to change are important too.
2. Respect people and shared spaces
Wrap used disposable pads and put them in the designated bin; do not flush them. Reusable products need proper washing and drying as instructed. Friends can help by avoiding jokes and making it easy to ask for supplies or support.
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Question
Why is giving someone a pad alone not the whole solution at school?
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08 / EXPLORE & UNDERSTAND
Strong feelings can be understood and managed
Having an emotion and choosing an action are different.
Relationships are part of growing up
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1. Name the feeling without judging it
Adolescence may bring strong feelings, changing interests and a wish for greater independence. Hormones are part of the picture, but sleep, relationships and experiences matter too. Not every adolescent reacts in the same way.
2. Pause before deciding what to do
A student who feels angry after an argument can pause, name the feeling and speak to someone calmly rather than sending a hurtful message. Sport, music and creative activities can provide positive outlets. Persistent distress deserves support, not teasing or dismissal.
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Question
Does feeling angry mean someone must act aggressively?
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09 / EXPLORE & UNDERSTAND
Growing bodies need varied food
No single food supplies everything.
1. Connect nutrients with jobs
Carbohydrates and fats provide energy. Proteins support growth and repair. Calcium supports bones, while iron helps the body make haemoglobin for carrying oxygen in blood. Vitamins and other minerals have important roles too.
2. Use familiar, affordable foods
Meals can combine locally available grains or millets, pulses or other protein foods, vegetables, fruit and suitable milk or alternatives. The exact choices can differ. A nutrient deficiency needs proper assessment; a supplement should not be guessed from tiredness alone.
A little deeper: Vitamin B12 and a scientist who studied it
The chapter introduces Dorothy Hodgkin’s work on the structure of vitamin B12. B12 supports normal blood and nerve functions. Food sources and individual needs differ, so questions about deficiency or diet restrictions belong with a qualified health professional.
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Question
Why is eating only one “healthy” food not enough?
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10 / EXPLORE & UNDERSTAND
Make room for movement and rest
Well-being includes the body, mind and relationships.
Different ways to move together
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1. Choose enjoyable activity
Games, walking, dancing and other suitable activities help build fitness and can improve mood. Activities can be adapted for different abilities. Participation and enjoyment matter more than comparing every body or always winning.
2. Balance activity with rest and respect
Growing adolescents need rest, regular routines and supportive relationships too. Include others, listen and respect personal boundaries. A healthy social life does not require copying everything friends do.
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Question
How could a game be made welcoming for classmates with different abilities?
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11 / EXPLORE & UNDERSTAND
Kindness and privacy matter online too
A screen does not remove responsibility for how we treat others.
1. Recognise the harm
Spreading rumours, repeated hurtful messages or sharing someone’s private information can harm them online. Do not forward an embarrassing image as a joke. Ask permission before sharing another person’s photo or information.
2. Respond with support
If someone is targeted, the blame belongs to the person bullying, not the target. Tell a trusted adult, keep relevant evidence and use reporting or blocking tools with support. Avoid sharing passwords, addresses or private details with strangers.
Your turn
Question
What is a helpful response when a group shares an unkind image of a classmate?
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12 / EXPLORE & UNDERSTAND
Say no to pressure; ask for help without shame
Trying to fit in is not a reason to risk health.
1. Practise a clear refusal
A friend may say “just once” about tobacco, alcohol or another harmful substance. A clear “No, I do not want to” is enough. Move away from pressure and speak to a trusted adult. You do not need to win an argument to protect your choice.
2. Support a person who needs help
Substance use can harm health and become difficult to control. Someone struggling deserves support and qualified care, not insults. A trusted adult, counsellor or health professional can help connect them with services.
Your turn
Question
Why is “I can always stop whenever I want” not a safe assumption about addictive substances?
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13 / EXPLORE & UNDERSTAND
Hormones help coordinate the changes
The body uses chemical messages as well as nerve signals.
1. Link the inside signals with outside changes
Hormones help regulate growth, puberty and the menstrual cycle. Signals involving the brain and hormone-producing organs coordinate these processes. A hormone is not a feeling or a visible body part; it is a chemical messenger.
2. Use knowledge to seek the right support
Learning about hormones helps explain changes without blame or shame. India’s RKSK programme supports adolescent health across several needs, not only periods. A teacher or local health service can explain which support is available nearby.
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Question
Why is “hormones control everything I do” an incomplete explanation?
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Sign inNew here? Sign up freeCHAPTER RECAP
Take these ideas with you
- Adolescence includes physical, emotional and social development.
- Puberty is physical maturation, and its timing varies.
- Menstruation is natural, not impurity.
- Varied food, hygiene, activity, rest and support help well-being.
- Respect privacy and boundaries offline and online.
- Hormones help coordinate changes; nobody should be teased for them.
Use your understanding in a new situation
Question
A student grows earlier than friends and is teased. Give a scientific explanation and a supportive action.
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Sign inNew here? Sign up freeQuestion
Why should puberty not be treated as proof of readiness for adult responsibilities?
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Sign inNew here? Sign up freeNCERT · Chapter source PDF, pages 12, 13 · Original Learnijoy explanations and practice.