NCERT Class VIII Science Solutions: Chapter 10-Reaching the Age of Adolescence Part 7 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Question 26:

Salma had a very soft and smooth skin during her childhood. As she entered adolescence, she developed pimples on her face. The skin specialist advised her to wash her face at regular intervals. Can you explain the reasons for the appearance of pimples on her face and suggest ways to prevent them?


During adolescence, the secretion of sweat glands and sebaceous glands increases leading to formation of acne and pimples. Regular face wash keeps the face clean and dry and helps to reduce the pimples.

How to Get Rid of Acne and Pimple

Question 27:

Our government has legalized the age for marriage in boys and girls. Give reasons as to why one should get married after a certain age.


In our country, the legal age for marriage is 18 years for girls and 21 years for boys. This is because teenage mothers are not prepared mentally or physically for motherhood. Early marriage and motherhood causes health problems in both mother and the child. It also curtails employment opportunities for the young woman and may cause mental agony as she is not ready to shoulder responsibilities of motherhood. Also, the boys before that age may not be mentally matured and financially secure enough to take on the responsibilities of a family.

Question 28:

It is believed that height of a child depends upon the genes inherited from parents. However, it is often seen that tall parents may have short children and vice-versa. Are there factors other than genes that can cause these variations?


Height of a child depends upon the genes inherited from parents. However, there are some other factors also that can affect height. These factors include balanced diet hormones, exercise and diseases. Balanced diet is essential for the adolescents as it helps the bones, muscles and other parts of the body to get adequate nourishment for growth.

Similarly, lack of hormones as growth hormones may lead to dwarfism.

Regular exercise is also essential for healthy muscles, bones and joints and their proper development. Lack of disease is a priority for growth that is related to other factors listed above. Thus, height depends on combination of various factors and the absence or deficiency of any one of them can cause variations. This is why, tall parents may have short children and vice-versa.

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