Last updated on February 9th, 2024 at 04:38 pm
CG Board Class 8 Science Adolescence Notes / Textbook Exercises and Extra Question and Answers.
Find out the correct and incorrect sentences.
1. Mothers are responsible for the sex of the unborn child.[Incorrect – father is responsible]
2. Children gain height during adolescence.[correct]
3. During menstruation girls should not be allowed to work in kitchen.[incorrect – it is a myth]
4. Children in the age group of 13-19 are called infants.[incorrect – 13-19 are called adolescents]
5. The zygote with XY chromosome pair develops into a male child.[correct]
6. Body of girls becomes unholy during menstruation.[incorrect]
Choose the correct option –
i. Adolescents should be careful about what they eat, because-
A. Proper diet develops their brains.
B. Proper diet is needed for the rapid growth taking place in their body.[answer]
C. Adolescents feel hungry all the time.
D. Taste buds are well developed in teenagers.
ii. Reproductive age starts when –
A. Menstruation starts.[answer]
B. Breasts start developing.
C. Body weight increases.
D. Height increases.
iii. The right meal for adolescents consists of –
A. Chips, noodles, chocolate
B. Chapatti, dal, vegetables [answer]
C. Rice, noodles and chips
D. Vegetable, chips and cold drink.
iv. Following is male hormone –
A. Testosterone [answer]
B. Estrogens
C. Insulin
D. Thyroxin
Answer These
Q: Which chromosomes are responsible for the determination of sex in human?
In humans, sex is determined by the sex chromosomes, X and Y. Females have two X chromosomes (XX), and males have one X and one Y chromosome (XY).
Q: Name the hormones responsible for the changes occurring in adolescence at puberty.
The hormones responsible for changes in adolescence at puberty are testosterone in males and estrogen in females
Q: What is the span of reproductive life in females?
The span of reproductive life in females starts at puberty (around 10-12) and typically ends at menopause (around 45-50).
