Class 8 Science
Multiple Choice Questions
Question 1: Adolescence usually ends at which age?
- 18 years
- 17 years
- 16 years
- 15 years
Answer: (a) 18 years
Question 2: Which hormone is responsible for secondary sexual characters in girls?
Answer: (a) Estrogen
Question 3: What is the normal duration of menstrual cycle?
- 2 to 7 days
- 14 days
- 28 to 30 days
- 40 weeks
Answer: (c) 28 to 30 days
Question 4: Reproductive phase in women continues for how many decades?
Answer: (d) Four
Question 5: Pancreas secretes which of the following hormones?
Answer: (b) Insulin
Question 6: Iodine is essential for proper working of which of the following endocrine glands?
Answer: (a) Thyroid
Question 7: Which of the following glands secretes the growth hormone?
Answer: (b) Pituitary
Question 8: Which hormone prepares the body for stress situations?
Answer: (c) Adrenaline
Very Short Answer Type Questions
Question 1: What is puberty?
Answer: The process of changes during adolescence period is called puberty.
Question 2: What are the secondary sexual characters in boys?
Answer: Facial hairs, deep voice and hair on chest.
Question 3: What are the secondary sexual characters in girls?
Answer: Enlargement of breasts and high pitched voice
Question 4: What are the common characters in boys and girls of teenage?
Answer: Hair under armpits, hair in pubic region
Question 5: What do you understand by menstrual cycle?
Answer: The cycle of events which begin from release of an egg and end in shedding off egg is called menstrual cycle.
Question 6: What is menarche?
Answer: The first menstrual bleeding is called menarche.
Question 7: Which hormones control the metamorphosis of larva into insect?
Answer: Insect hormones
Question 8: Which hormone controls the metamorphosis of tadpole into frog?
Short Answer Type Questions
Question 1: Explain puberty.
Answer: The process of changes during adolescence period is called puberty. Beginning of puberty marks the beginning of adolescence. End of puberty marks the completion of reproductive maturity.
Question 2: Write a brief note on personal hygiene for adolescents.
Answer: You have read that sweat and sebaceous glands show increased activity during this period. If proper hygiene is not maintained, it can lead to many skin diseases in adolescents. Girls need to take special care of hygiene during menstrual period.
Question 3: In some teenage boys, the voice suddenly becomes hoarse. Why does this happen and how is it rectified?
Answer: In some boys, the muscles of the voice box go out of control when the vocal chords increase in size. Due to this, the voice becomes hoarse. The hoarse voice persists for a few days or a few weeks, and becomes normal on its own.
Question 4: Write a short note on HIV.
Answer: This is a virus which causes AIDS (Acquired Immunodeficiency Disease). Till date, there is no cure for this disease. Hence, prevention is the only way to keep away from this dangerous disease. AIDS can spread through sexual contact, through infected needles and from a mother to her unborn child. This can also be transmitted to an infant through mother’s milk.
Question 5: Write a short note on goiter.
Answer: This disease happens due to iodine deficiency. Iodine deficiency results in less production of thyroxin. This may result in a disease called goiter which is manifested by a permanent swelling in the neck.