Class 7 Science - ODISHA
Adolescence: A Stage of Growth and Change
The chapter 'Adolescence: A Stage of Growth and Change' for Class 7 Odisha (BSE) students explores the fascinating biological transformation from childhood to adulthood. It covers crucial physical and mental changes such as puberty, the development of secondary sexual characters, and the role of hormones secreted by endocrine glands. Students also learn about reproductive health, personal hygiene, and the importance of a balanced diet during this rapid growth phase. This chapter is highly important for the BSE Odisha board exams as it tests both conceptual understanding of human biology and awareness of health and hygiene, frequently featuring in short notes and structural questions.
Start Learning FreeKey Concepts
Adolescence and Puberty
Adolescence is the period of life when the body undergoes changes leading to reproductive maturity, starting around age 11 and lasting up to 18 or 19. Puberty is the specific onset phase marked by major physical and hormonal changes.
Secondary Sexual Characters
These are physical features that help distinguish males from females, such as the growth of facial hair and deepening of voice in boys, and the development of breasts and wider hips in girls, controlled by hormones.
Role of Hormones
Hormones are chemical substances secreted by endocrine glands directly into the bloodstream. Testates secrete testosterone in boys, while ovaries secrete estrogen in girls, which trigger reproductive maturity.
Reproductive Phase in Humans
In females, the reproductive phase begins at puberty (menarche) and lasts till about 45 to 50 years of age (menopause), marked by the monthly menstrual cycle.
Nutritional Needs and Hygiene
Adolescents experience rapid growth and require a balanced diet rich in proteins, carbohydrates, fats, and vitamins, along with strict personal hygiene to prevent infections and body odor.
Important Formulas
Board Exam Info
In the Odisha (BSE) Class 7 Science examinations, this chapter typically carries around 4 to 6 marks. Common question types include defining puberty and hormones, explaining secondary sexual characters, differentiating between endocrine and exocrine glands, and solving height calculation numericals.
Frequently Asked Questions
What is the difference between adolescence and puberty?
Adolescence is the entire transitional phase of growth from childhood to adulthood (roughly ages 11 to 19), whereas puberty is the specific period within adolescence when the reproductive organs become functional.
Why do pimples and acne occur during adolescence?
During adolescence, the secretion of sweat and sebaceous (oil) glands increases. Increased oil production combined with dead skin cells often clogs skin pores, leading to pimples and acne.
How can we calculate the final height of an adolescent?
You can estimate final height using the standard formula based on age percentage charts: dividing the child's present height by the percentage of full height achieved at that age, then multiplying by 100.
Learn Adolescence: A Stage of Growth and Change with Your AI Tutor
10 different ways to study this chapter. Free for 3 chapters per day.
Lecture
Key Points
Interactive
Quiz
Flashcards