Ans. In girls, adolescence may begin a year or two earlier than in boys.
Ans. The most conspicuous change during puberty is the sudden increase in height.
Ans. In our country, the legal age for marriage is 18 years for girls and 21 years for boys.
Ans. Girls develop broader hips during puberty. Due to this, region below the waist becomes wider.
Ans. Adolescence begins around the age of 11 and lasts up to 18 or 19 years of age.
Ans. Endocrine glands release hormones directly into the bloodstream. So, they are also termed ductless glands.
Ans. In a frog, metamorphosis is controlled by thyroxine, the hormone produced by thyroid.
Ans. At puberty, male sex organs like the testes and penis develop completely. The testes also begin to produce sperms.
Ans. In girls, the ovaries enlarge and eggs begin to mature. Also ovaries start releasing mature eggs.
Ans. The period during which adolescent boys and girls reach sexual maturity and become capable of reproduction is called puberty.
Ans. Hormones are chemical substances. These are secretions from endocrine glands, or endocrine system.
Ans. Adrenals also produce the hormone adrenalin. It helps the body to adjust to stress when one is very angry, embarrassed or worried.
Ans. Adolescence is often the time in one’s life when the brain has the greatest capacity for learning.
Ans. Diabetes is caused by the insufficient production of insulin hormone by pancreas.
Ans. Adrenal glands secrete hormones which maintain the correct salt balance in the blood.
Ans. Walking and playing in fresh air keeps the body fit and healthy. Thus, all young boys and girls should take walks, exercise and play outdoor games.
Ans. In girls, the larynx is hardly visible from the outside because of its small size. The smaller voice box in girls gives shrill voice or high pitched voice to the girls.
Ans. Iron mineral is important for our body because it builds blood. Iron-rich food includes leafy vegetables, jaggery, meat, citrus, Indian gooseberry (amla) etc.
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