This MCQ module is based on: Physical Changes and Menstrual Hygiene
TOPIC 20 OF 46
Physical Changes and Menstrual Hygiene
🎓 Class 7
Science
CBSE
Theory
Ch 6 — Adolescence
⏱ ~14 min
🌐 Language: [gtranslate]
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6.3 Physical Changes during Adolescence
In Part 1, we met the chemical messengers — hormones — that whisper to the body, "time to grow up." Now we will see what those whispers actually do. During puberty, the body changes in many visible ways. Some of these changes are shared by everyone; others happen differently in boys and in girls.
Remember: These changes are signs that the body is healthy and developing normally. They happen at slightly different times for different people — and that is perfectly fine.
Changes Common to All Adolescents
- Growth spurt — a sudden rapid increase in height and weight. Arms and legs may grow faster than the rest of the body, making one feel a little clumsy at first.
- Hair growth in the underarms (armpits) and the pubic region.
- Pimples and acne — oil glands in the skin become more active, so small spots may appear on the face, back or shoulders.
- Increased sweating and sometimes body odour — a good daily bath helps keep one fresh.
Changes Specific to Boys
- Shoulders and chest become broader.
- Growth of facial hair — moustache and beard start to appear.
- The voice deepens. During this transition the voice may "crack" — turn high and low in the same sentence. This settles down in a few months.
- Muscles develop, and the overall body becomes stronger.
Changes Specific to Girls
- The hips broaden and the overall body shape changes.
- Breast development begins.
- The menstrual cycle starts — the first period is called menarche.
The Menstrual Cycle — A Natural Monthly Rhythm
Menstruation is a completely natural process. Every month, the uterus (a small organ in the lower abdomen) prepares a soft lining in case a baby is to grow there. When no baby begins to grow, the lining is no longer needed, so it leaves the body through the vagina, along with a small amount of blood. This is what we call a period.
- A typical cycle is about 28 days long (though 21–35 days is also normal).
- Each period of bleeding usually lasts 3 to 7 days.
- The first period (menarche) often happens between ages 10 and 14.
Menstrual Hygiene — Staying Fresh and Healthy
Good hygiene during periods keeps the body comfortable and prevents infection. It is something every girl — and every boy, as a caring brother, friend or classmate — should understand.
- Use clean sanitary pads, menstrual cups or other hygiene products designed for periods.
- Change pads every 4–6 hours (more often on heavy-flow days) to stay fresh and avoid rashes or infection.
- Wash the outer genital area with clean water daily. Soap is not needed inside.
- Dispose of used pads carefully — wrap them in paper and put them in the dustbin. Do not flush pads in the toilet.
- Wash hands before and after changing a pad.
Diet & Self-care during Periods
- Drink plenty of water.
- Eat iron-rich foods to replace the small blood loss — palak (spinach), chukandar (beetroot), rajma, dates, jaggery, eggs.
- Include fruits and whole grains; avoid very oily or junk food if one feels bloated.
- Gentle exercise, yoga or a warm-water bottle helps with cramps.
- Sleep well — rest is a quiet medicine.
Busting Myths — Menstruation Is Natural, Not Impure
In some homes and communities, outdated beliefs still surround menstruation. Many of these beliefs are simply myths — they have no scientific basis. A period is a healthy biological process, just like breathing or digestion. A girl on her period is in no way "impure" or "untouchable."
The truth, simply:
• A girl on her period can attend school, play, pray if she wishes, cook, touch anyone, and eat every normal food.
• She is not ill. She is not impure.
• Support, kind words and a clean pad go much further than outdated restrictions.
• A girl on her period can attend school, play, pray if she wishes, cook, touch anyone, and eat every normal food.
• She is not ill. She is not impure.
• Support, kind words and a clean pad go much further than outdated restrictions.
Interactive: Myth or Fact?
Read each statement and decide — click a button to check.
1. "A girl should not go to school during her period."
2. "Changing a pad every 4–6 hours keeps you fresh and prevents infection."
3. "A menstruating girl should not enter the kitchen."
4. "Eating iron-rich foods like palak and chukandar is helpful during periods."
5. "Exercise and normal play are harmful during a period."
Mary and Manoj — A Conversation Worth Having
Mary and Manoj are in the same Class 7. One afternoon Mary feels unwell during class and needs to step out. She is embarrassed because it is her first period and she has not told anyone. Manoj notices, and being a thoughtful friend, quietly lets the class teacher know.
Should a boy like Manoj know about menstruation? Yes. When boys and girls both understand that periods are natural, school becomes a safer, kinder place for everyone. Boys grow up to be supportive brothers, husbands, fathers and colleagues. Knowledge replaces awkwardness; dignity replaces shame.
Support in India: Many state governments now provide free sanitary pads to girls in government schools. If you or a friend ever need one in school, do ask the class teacher or school nurse — that is exactly why these schemes exist.
Activity 6.2 — Make a Period Kit & Cycle Tracker L3 Apply
Put together a small zip pouch (the "period kit") to keep in the school bag:
- Two clean sanitary pads in the original wrapper
- A small pack of tissues
- A spare pair of underwear in a plastic bag
- A small chocolate or biscuit
- A card with the phone numbers of parents/guardian
Then draw a simple cycle tracker: a grid of 30 days. On each day that bleeding occurs, colour the box red. After two or three cycles you can see how many days your cycle is.
Predict: Why is tracking your cycle useful, even at 12 or 13?
Tracking helps you anticipate the next period (so you carry pads in advance), notice if something is unusual (e.g. very long or painful bleeding — something to tell a trusted adult or doctor), and understand your own body's rhythm. It builds confidence and self-care, not worry.
Competency-Based Questions L3 Apply
Asha (12) has just started her first period. She is nervous and does not know what to do. Her elder cousin Meera guides her with the correct information.
1. Which of the following physical changes is common to both boys and girls during puberty?
(c) Growth spurt — a rapid increase in height and weight happens in all adolescents. Options (a) and (d) are girl-specific; (b) is boy-specific.
2. State how often a sanitary pad should be changed, and explain why.
A sanitary pad should be changed every 4 to 6 hours. This keeps the area clean and dry, prevents the growth of bacteria, and avoids rashes, bad odour or infection.
3. Name two iron-rich foods recommended during menstruation and state why iron is needed. L2
Two iron-rich foods: palak (spinach) and chukandar (beetroot) — also rajma, dates, jaggery, eggs. Iron is needed because the small amount of blood lost during the period contains iron; eating iron-rich foods replaces this and keeps energy levels steady.
4. True or False: A girl who is menstruating is "impure" and should avoid common activities.
False. Menstruation is a natural, healthy process. A menstruating girl can attend school, play, cook, eat all foods and do everything she does on any other day.
5. Mary's friend Manoj feels awkward when the teacher discusses menstruation in class. Explain why it is important for Manoj to learn about it. L5
Boys grow up into brothers, friends, husbands and fathers. Knowing about periods helps them be supportive and respectful, bust myths in their own families, and create a kinder classroom and society. Knowledge turns embarrassment into empathy.
Assertion–Reason Questions
Choose: (A) Both true, R explains A. (B) Both true, R does not explain A. (C) A true, R false. (D) A false, R true.
A: During menstruation, iron-rich foods are recommended.
R: A small amount of iron is lost with the blood during a period.
(A) — R is exactly why A is advised. Iron from foods like palak and chukandar replaces the small loss.
A: Boys should also learn about menstruation.
R: Menstruation is a disease that needs medical treatment in all girls.
(C) — A is true (shared knowledge builds empathy and support), but R is false: menstruation is a natural process, not a disease.
A: The voice of a boy may "crack" during puberty.
R: The voice box (larynx) grows larger under the influence of male hormones.
(A) — The enlarging voice box produces the characteristic "cracking" before it settles into a deeper adult voice.
Frequently Asked Questions — Physical Changes and Menstrual Hygiene
What does the topic 'Physical Changes and Menstrual Hygiene' cover in Class 7 Science?
The topic 'Physical Changes and Menstrual Hygiene' is part of NCERT Class 7 Science Chapter 6 — Adolescence: A Stage of Growth and Change. It covers the key ideas of physical changes, menstrual cycle, hygiene, reproductive health, nutrition, body care, explained through everyday examples, labelled diagrams and hands-on activities drawn from the NCERT Curiosity textbook. Students learn not just definitions but also the reasoning behind each concept so they can answer competency-based questions and assertion–reason items. The lesson helps Class 7 students build a strong base for higher classes by linking each idea to real observations at home, school and in nature, and by preparing them for CBSE school assessments and Olympiads.
Why is 'Physical Changes and Menstrual Hygiene' important for Class 7 NCERT Science?
'Physical Changes and Menstrual Hygiene' is important because it builds core scientific thinking that Class 7 students will use throughout middle and secondary school. NCERT Chapter 6 — Adolescence: A Stage of Growth and Change — introduces physical changes and related ideas that appear again in Class 8, 9 and 10 Science. Mastering this subtopic helps students read labels and safety signs, understand news about science and technology, and perform better in CBSE school exams. The chapter also encourages curiosity and evidence-based thinking — skills that support the National Education Policy (NEP) 2020 focus on conceptual understanding and competency-based learning.
What are the key concepts students should remember from Physical Changes and Menstrual Hygiene?
The key concepts in 'Physical Changes and Menstrual Hygiene' for Class 7 Science are: physical changes, menstrual cycle, hygiene, reproductive health, nutrition, body care. Students should be able to define each term in their own words, give at least one everyday example, and explain how the concept connects to other chapters in NCERT Class 7 Science. For example, linking the idea to daily life — in the kitchen, classroom or outdoors — makes revision easier. Writing short notes, drawing labelled diagrams and solving the NCERT in-text and exercise questions for Chapter 6 will help students retain these concepts for unit tests and the annual CBSE examination.
How is Physical Changes and Menstrual Hygiene taught using activities in NCERT Curiosity Class 7?
NCERT Curiosity Class 7 Science teaches 'Physical Changes and Menstrual Hygiene' using an inquiry-based approach with Predict–Observe–Explain activities. Students are asked to make a guess first, then perform a simple experiment with safe, easily available materials, and finally explain what they observed. This matches the NEP 2020 focus on learning by doing. For Chapter 6 — Adolescence: A Stage of Growth and Change — the textbook includes hands-on tasks, labelled diagrams and questions that build Bloom's Taxonomy skills from Remember (L1) to Create (L6). Teachers use these activities, along with competency-based questions (CBQs) and assertion–reason items, to check real understanding rather than rote memorisation.
What real-life examples of physical changes can Class 7 students observe at home?
Class 7 students can observe physical changes at home in many simple ways linked to 'Physical Changes and Menstrual Hygiene'. Kitchens, school bags, playgrounds and the night sky are full of examples that connect to NCERT Chapter 6 — Adolescence: A Stage of Growth and Change. For instance, students can check labels on food and cleaning products, watch changes while cooking, or observe the Sun and Moon across a week. Keeping a small science diary — noting the date, what was observed and a quick sketch — turns everyday life into a science lab. These real-life connections make concepts stick and prepare students well for competency-based questions in CBSE Class 7 Science.
How does 'Physical Changes and Menstrual Hygiene' connect to other chapters of Class 7 Science?
'Physical Changes and Menstrual Hygiene' connects to many other chapters in NCERT Class 7 Science Curiosity. The ideas of physical changes appear again when students study related topics like heat, light, changes, life processes and Earth-Sun-Moon. For example, understanding this subtopic helps in building mental models for later chapters and for Class 8, 9 and 10 Science. Teachers often use cross-chapter questions in CBSE examinations to test whether students can apply what they learned in Chapter 6 — Adolescence: A Stage of Growth and Change — to new situations. This integrated approach matches the NEP 2020 and NCF 2023 focus on holistic, competency-based learning.
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