Complete the table given below. Puberty changes Male female Voice change Change in body shape Sex organs development Hair growth

Puberty changes Male female Voice change Deeper voice High-pitched voice Change in body shape Shoulders become broader Hips get broader Sex organs development Testes start producing sperm Ovaries enlarge and menstruation starts Hair growth Hair growth on the face, chest, armpit and pubic regions Hair growth in the armpit and pubic regions Puberty in males: For a male, the physical changes of puberty usually start with the testicles getting bigger. Dark, coarse, curly hair will sprout just above the penis and on the scrotum. Puberty in females: Puberty in girls usually begins between the ages of 8 and 13 and lasts for several years. It is the time when your body develops and matures.

Search for the following in the word search puzzle given below. Period of transition from childhood to adulthood Reaching the age of sexual maturity. Gland which releases the growth hormone. Disease caused due to deficiency of a pancreatic hormone. Reproductive organs This hormone controls the metabolic rate. Voice box. Disease caused by deficiency of calcium and vitamin D. Onset of puberty in females. Transition of tadpole into a frog. Stress regulating hormone. Male gamete. Chromosomes other than the sex chromosomes. Hormone produced by the pancreas.

1. Adolescence is a transitional stage of development between childhood and adulthood. It is characterised by physical and mental human development. 2. Puberty is the period of sexual maturation in humans. It is a phase of development which includes the maturation of reproductive organs and the development of secondary sexual characters. 3. Pituitary gland releases the growth hormones that regulate the growth and development of the body. 4. Insulin is a hormone released by the pancreas that lowers the blood sugar level. When insulin is not produced in sufficient quantity, it results in diabetes. 5. Reproductive organs or sex organs called gonads are associated with sexual reproduction and are responsible for the production of gametes (sperm and eggs). 6. Thyroid gland releases the thyroxine hormone that regulates the metabolic rates of several body functions. 7. The structure that is also known as the voice box is larynx. It plays an important role in the production of sound. 8. Disease caused by deficiency of calcium and vitamin D is osteoporosis. This condition is characterised by loss of bone density and a higher risk of fractures. 9. The onset of puberty in females is known as menarche. Menarche is the first occurrence of menstruation, that is the monthly shedding of the uterine lining and the release of an unfertilised egg. 10. The process of transformation from a tadpole to a frog is called metamorphosis. The hormone thyroxine, produced by thyroid gland, is necessary to carry out this process. 11. The hormone that controls the body's response to stress is known as adrenaline. It is produced and released by the adrenal glands. 12. The male gamete is the sperm. Sperm is the reproductive cell produced by the testes. 13. Autosomes are chromosomes other than the sex chromosomes. Out of 46 chromosomes in the nucleus of a cell, the first 44 chromosomes are called the autosomes. 14. The hormones produced by the pancreas is insulin, that helps to maintain the blood sugar levels in humans.

NCERT Solutions for Chapter: Reaching the Age of Adolescence, Exercise 1: Exercise

Author:NCERT

NCERT Science Solutions for Exercise - NCERT Solutions for Chapter: Reaching the Age of Adolescence, Exercise 1: Exercise

Attempt the practice questions on Chapter 10: Reaching the Age of Adolescence, Exercise 1: Exercise with hints and solutions to strengthen your understanding. Science Textbook of Competency Based Questions for Class VIII solutions are prepared by Experienced Embibe Experts.

Questions from NCERT Solutions for Chapter: Reaching the Age of Adolescence, Exercise 1: Exercise with Hints & Solutions

MEDIUM

8th CBSE

IMPORTANT

Science Textbook of Competency Based Questions for Class VIII>Chapter 7 - Reaching the Age of Adolescence>Exercise>Q 2

In which body part of a woman does a fertilised ovum get embedded?

MEDIUM

8th CBSE

IMPORTANT

Science Textbook of Competency Based Questions for Class VIII>Chapter 7 - Reaching the Age of Adolescence>Exercise>Q 3

An ovum contains one X chromosome. A sperm contains an X or a Y chromosome. A sperm can fertilise an ovum to produce two different zygotes.

Question Image

Which of these statements is supported by the picture?

MEDIUM

8th CBSE

IMPORTANT

Science Textbook of Competency Based Questions for Class VIII>Chapter 7 - Reaching the Age of Adolescence>Exercise>Q 5

What is the legal age for marriage in India?

HARD

8th CBSE

IMPORTANT

Science Textbook of Competency Based Questions for Class VIII>Chapter 7 - Reaching the Age of Adolescence>Exercise>Q 9

Diabetes is a condition in which the blood sugar level of a person rises above the normal level.

The table below shows the average range of blood sugar levels at fasting.

Question Image

Doctors prescribe insulin injections for patients with high blood sugar levels. However, glucagon is injected in an emergency if the blood sugar level of a person drops too low.

Under what conditions of blood sugar level is glucagon likely to be injected?

HARD

8th CBSE

IMPORTANT

Science Textbook of Competency Based Questions for Class VIII>Chapter 7 - Reaching the Age of Adolescence>Exercise>Q 47

Complete the table given below.