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Adolescence: A Stage of Growth and Change - Personal hygiene

Grade 7CBSE

Review the key concepts, formulae, and examples before starting your quiz.

🔑Concepts

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During puberty, the secretion of sweat glands and sebaceous glands (oil glands) increases. This increased activity can lead to body odor and the development of acne or pimples on the face.

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Personal hygiene is essential to prevent bacterial infections. All parts of the body should be washed and cleaned daily during a bath.

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If cleanliness is not maintained, bacterial and fungal infections can occur due to the accumulation of sweat and oils.

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Menstrual Hygiene: Girls should maintain high standards of cleanliness during menstruation. They should keep track of their menstrual cycle and use clean sanitary napkins or tampons, changing them every 44 to 66 hours as per requirement.

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Physical Exercise: Walking and playing in the fresh air keeps the body fit and healthy. All young boys and girls should take walks, exercise, and play outdoor games to complement their physical growth.

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Say 'No' to Drugs: Adolescence is a period of confusion and insecurity. One should never take drugs unless prescribed by a doctor, as they are addictive and harmful to health and happiness.

📐Formulae

Calculation for full height (cm)=Present height (cm)% of full height at this age×100\text{Calculation for full height (cm)} = \frac{\text{Present height (cm)}}{\text{\% of full height at this age}} \times 100

💡Examples

Problem 1:

A boy is 99 years old and 120 cm120\text{ cm} tall. According to the growth chart, a 99-year-old boy has reached 75%75\% of his full height. Calculate his expected final height.

Solution:

Expected final height =12075×100=160 cm= \frac{120}{75} \times 100 = 160\text{ cm}.

Explanation:

We use the standard growth formula: Full Height=Present heightPercentage of full height×100\text{Full Height} = \frac{\text{Present height}}{\text{Percentage of full height}} \times 100. Substituting the values: 12075×100=1.6×100=160 cm\frac{120}{75} \times 100 = 1.6 \times 100 = 160\text{ cm}. Thus, the boy is expected to be 160 cm160\text{ cm} tall.

Problem 2:

Why do many young people get acne and pimples on their face during adolescence?

Solution:

This is due to the increased activity of sweat and sebaceous glands.

Explanation:

During puberty, the secretion of sweat glands and oil (sebaceous) glands increases significantly. The excess oil can clog pores and trap bacteria, leading to the formation of acne and pimples.