Tamil Nadu Board of Secondary EducationSSLC (English Medium) Class 8th
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Tamil Nadu Board Samacheer Kalvi solutions for Class 8th Science Answers Guide chapter 20 - Reaching the Age of Adolescence [Latest edition]

Chapters

Class 8th Science Answers Guide - Shaalaa.com
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Chapter 20: Reaching the Age of Adolescence

Exercise
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Exercise [Page 241]

Tamil Nadu Board Samacheer Kalvi solutions for Class 8th Science Answers Guide Chapter 20 Reaching the Age of AdolescenceExercise [Page 241]

Choose the best answer.

Exercise | Q I. 1. | Page 241

Adolescence is the period of life between _______ years of age.

  • 10 to 16

  • 11 to 17

  • 11 to 19

  • 11 to 20

Exercise | Q I. 2. | Page 241

The period at which an organism attains sexual maturity is called _____

  • puberty

  • adolescence

  • growth

  • maturity

Exercise | Q I. 3. | Page 241

During puberty, the region below the waist become wider in _______.

  • boys

  • girls

  • Both a and b

  • None of these

Exercise | Q I. 4. | Page 241

Adam’s apple is the growth of the _____

  • pharynx

  • thyroid

  • larynx

  • parathyroid

Exercise | Q I. 5. | Page 241

Many adolescent boys and girls get pimples on the face, due to the secretions of _________ gland.

  • sweat

  • sebaceous

  • sweat and sebaceous

  • None of these

Exercise | Q I. 6. | Page 241

The sperm is produced by ______.

  • penis

  • ovary

  • uterus

  • testes

Exercise | Q I. 7. | Page 241

________ are the chemical substances, secreted by endocrine glands.

  • Hormones

  • Enzymes

  • Proteins

  • Fatty acids

Exercise | Q I. 8. | Page 241

Androgen production is regulated by ______

  • GH hormone

  • LH hormone

  • TSH hormone

  • ACTH hormone

Exercise | Q I. 9. | Page 241

During menstruation, the progesterone level is _____

  • decreased

  • increased

  • ceased

  • normal

Exercise | Q I. 10. | Page 241

______ intake needs to be increased to prevent osteoporosis in later life.

  • Potassium

  • Phosphorus

  • Iron

  • Calcium

Exercise [Page 241]

Tamil Nadu Board Samacheer Kalvi solutions for Class 8th Science Answers Guide Chapter 20 Reaching the Age of AdolescenceExercise [Page 241]

Fill in the blanks.

Exercise | Q II. 1. | Page 241

________ is secreted by the ovaries of female.

Exercise | Q II. 2. | Page 241

The hormones secreted by the gonads are controlled by ________.

Exercise | Q II. 3. | Page 241

Milk secretion during lactation is controlled by ________ hormone.

Exercise | Q II. 4. | Page 241

The male and the female gamete fuse together and form ______.

Exercise | Q II. 5. | Page 241

The first menstrual flow begins at puberty and it is termed as ______.

Exercise | Q II. 6. | Page 241

_______ usually occurs 14 days after ovulation.

Exercise | Q II. 7. | Page 241

______ includes protein, carbohydrates, fats and vitamins in requisite proportion.

Exercise | Q II. 8. | Page 241

________ helps to prevent thyroid gland related diseases.

Exercise | Q II. 9. | Page 241

Iron deficiency leads to ______.

Exercise | Q II. 10. | Page 241

In women fertilization takes place at ______.

Exercise [Pages 241 - 242]

Tamil Nadu Board Samacheer Kalvi solutions for Class 8th Science Answers Guide Chapter 20 Reaching the Age of AdolescenceExercise [Pages 241 - 242]

State true or false. If false, correct the statement.

Exercise | Q III. 1. | Page 241

There is a sudden increase in the height of both boys and girls during puberty.

  • True

  • False

Exercise | Q III. 2. | Page 242

The release of ovum from the uterus is called ovulation.

  • True

  • False

Exercise | Q III. 3. | Page 242

During pregnancy, the corpus luteum continues to grow and produces large amount of estrogen and progesterone.

  • True

  • False

Exercise | Q III. 4. | Page 242

Making use of disposable napkins or tampons may increase the chances of infections.

  • True

  • False

Exercise | Q III. 4. | Page 242

Making use of disposable napkins or tampons may increase the chances of infections.

  • True

  • False

Exercise | Q III. 5. | Page 242

Using clean toilets for defecation is a good practice.

  • True

  • False

Exercise [Page 242]

Tamil Nadu Board Samacheer Kalvi solutions for Class 8th Science Answers Guide Chapter 20 Reaching the Age of AdolescenceExercise [Page 242]

Exercise | Q IV. | Page 242

Match the following.

Puberty Testosterone
Adam’s apple Muscle development
Androgen at 45 to 50 years of age
ICSH Sexual maturity
Menopause Change in voice
Exercise [Page 242]

Tamil Nadu Board Samacheer Kalvi solutions for Class 8th Science Answers Guide Chapter 20 Reaching the Age of AdolescenceExercise [Page 242]

Answer briefly.

Exercise | Q V. 1. | Page 242

What is adolescence?

Exercise | Q V. 2. | Page 242

List out the changes which occur during puberty.

Exercise | Q V. 3. | Page 242

What do you mean by secondary sex characteristics?

Exercise | Q V. 4. | Page 242

What is fertilization?

Exercise | Q V. 5. | Page 242

Explain Menarche.

Exercise | Q V. 6. | Page 242

Explain the process of pregnancy.

Exercise | Q V. 7. | Page 242

Explain the importance of cleanliness during the time of menstrual cycle in girls.

Exercise | Q V. 8. | Page 242

How is adolescence differ from childhood?

Exercise [Page 242]

Tamil Nadu Board Samacheer Kalvi solutions for Class 8th Science Answers Guide Chapter 20 Reaching the Age of AdolescenceExercise [Page 242]

Answer in detail.

Exercise | Q VI. 1. | Page 242

What are the physical changes that occur in boys and girls during adolescence?

Exercise | Q VI. 2. | Page 242

Explain the role of hormones in reproduction.

Exercise | Q VI. 3. | Page 242

What is the menstrual cycle?

Exercise | Q VI. 4. | Page 242

Explain the nutritional needs of adolescence in brief.

Exercise [Page 242]

Tamil Nadu Board Samacheer Kalvi solutions for Class 8th Science Answers Guide Chapter 20 Reaching the Age of AdolescenceExercise [Page 242]

Higher Order Thinking Questions.

Exercise | Q VII. 1. | Page 242

What can you suggest to your classmates to keep himself/herself clean and healthy?

Exercise | Q VII. 2. | Page 242

Adolescence is the energistic stage. What health and good habits you want to develop?

Chapter 20: Reaching the Age of Adolescence

Exercise
Class 8th Science Answers Guide - Shaalaa.com

Tamil Nadu Board Samacheer Kalvi solutions for Class 8th Science Answers Guide chapter 20 - Reaching the Age of Adolescence

Tamil Nadu Board Samacheer Kalvi solutions for Class 8th Science Answers Guide chapter 20 (Reaching the Age of Adolescence) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the Tamil Nadu Board of Secondary Education Class 8th Science Answers Guide solutions in a manner that help students grasp basic concepts better and faster.

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Concepts covered in Class 8th Science Answers Guide chapter 20 Reaching the Age of Adolescence are Adolescence and Puberty, Secondary Sex Characteristics, Role of Hormones in Initiating Reproductive Function, Reproductive Phase of Life in Humans, Menstrual Cycle (Ovarian Cycle), Reproductive Health, Nutritional Needs of Adolescents, Personal Hygiene for Adolescence, Changes at Puberty.

Using Tamil Nadu Board Samacheer Kalvi Class 8th solutions Reaching the Age of Adolescence exercise by students are an easy way to prepare for the exams, as they involve solutions arranged chapter-wise also page wise. The questions involved in Tamil Nadu Board Samacheer Kalvi Solutions are important questions that can be asked in the final exam. Maximum students of Tamil Nadu Board of Secondary Education Class 8th prefer Tamil Nadu Board Samacheer Kalvi Textbook Solutions to score more in exam.

Get the free view of chapter 20 Reaching the Age of Adolescence Class 8th extra questions for Class 8th Science Answers Guide and can use Shaalaa.com to keep it handy for your exam preparation

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