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Adolescence: A Stage of Growth and Change - Making Adolescence a Joyful Experience

Grade 7CBSE

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

🔑Concepts

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Adolescence is the period of life between 1111 and 1919 years when the body undergoes changes leading to reproductive maturity. These individuals are often called 'teenagers'.

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Puberty is the period during which the human body becomes capable of reproduction. It ends when an adolescent reaches reproductive maturity.

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During puberty, there is a sudden increase in height. This occurs because the long bones, such as the bones of the arms and legs, elongate.

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Secondary sexual characters are features that help distinguish the male from the female, such as the growth of facial hair (mustache and beard) in boys and development of breasts in girls.

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Hormones are chemical substances secreted by endocrine glands. Testosterone is the male hormone, and Estrogen is the female hormone.

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The Pituitary Gland is known as the 'Master Gland' because it secretes hormones that control the activity of other endocrine glands.

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For a joyful and healthy adolescence, a Balanced Diet is crucial. This includes CarbohydratesCarbohydrates, ProteinsProteins, FatsFats, VitaminsVitamins, and MineralsMinerals in correct proportions.

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Iron is essential for blood formation. Adolescents, particularly girls, should consume iron-rich foods like green leafy vegetables, jaggery, and citrus fruits.

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Personal hygiene is vital as the increased activity of sweat and sebaceous (oil) glands can lead to body odor and acne/pimples during this stage.

📐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 1111 years old and is 140140 cm tall. At the end of the growth period, he is expected to be 80%80\% of his total height. What will be his predicted final height?

Solution:

Given: Present height = 140140 cm, Percentage of full height = 80%80\%. Using the formula: Full height=14080×100\text{Full height} = \frac{140}{80} \times 100 Full height=1.75×100=175 cm\text{Full height} = 1.75 \times 100 = 175 \text{ cm}

Explanation:

To find the expected full height, we divide the current height by the percentage of growth completed and multiply by 100100.

Problem 2:

Calculate the total weight of a balanced meal if it contains 5050 g of proteins, 150150 g of carbohydrates, and 2020 g of fats.

Solution:

To find the total weight, we sum the individual components: 50150+20220\begin{array}{r} 50 \\ 150 \\ + 20 \\ \hline 220 \end{array} The total weight is 220220 g.

Explanation:

A balanced diet for an adolescent involves summing the mass of various macronutrients to ensure nutritional targets are met.