Science Class 8th Test From Ch. 10-Reaching the Age of Adolescence
Max. Marks: 34 Time: 1 hour
Q1: Use the following information to answer the given question. (2 marks)
The given chart shows the average growth in the height of both boys and girls.
Age (in years) % of maximum height in cm
Boys Girls
8 72 77
9 75 81
10 78 84
11 81 88
12 84 91
13 88 95
14 92 98
15 95 99
16 98 99.5
17 99 100
18 100 100
If Anjali is 10 years old and 130 cm tall, then what will be Anjali’s height at the end of the growth period?
Q2: Use the following information to answer the given question. (2 marks)
During puberty, a number of changes occur in the body of an adolescent. Which of the following statements is incorrect? Tick it.
A. Height increases during puberty.
B. The size of the brain changes during puberty.
C. The structure of the body changes during puberty.
D. The activity of the sweat gland increases during puberty.
Q3: Use the following information to answer the given question. (2 marks)
Secondary sexual characteristics are characteristics that help distinguish between males and females.
Which of the following characteristics is observed only in boys at the time of puberty? Tick it.
A. Increase in height
B. Growth of hair in underarms
C. Increase in the size of larynx
D. Growth of hair in the pubic area
Q 4: Which of the following secondary sexual characteristics is not observed in boys? Tick it. (2 marks )
A. Growth of facial hair
B. Enlargement of larynx
C. Enlargement of ovaries
D. Growth of hairs on chest
Q 5: Use the following information to answer the given question. (2 marks)
The
changes that occur in the body of adolescents are under the control of
hormones. Which hormone controls the development of secondary sexual
characteristics in males during puberty? Tick the right option.
A. Testosterone
B. Thyroxin
C. Estrogen
D. Insulin
Q 6: Fill in the blank: (5 marks)
i). _____________ hormone maintains the balance of salt in the human body.
ii). The increased activity of _________ gland in adolescents makes the body smelly.
iii). ______________ endocrine gland secretes thyroxin.
iv). ____________ hormone stimulates metamorphosis (change of tadpole to adult frog) in frogs.
v). ______ sex chromosomes are present in human males
Q 8: Use the following information to answer the given question. (1 mark)
Testes
and ovaries secrete hormones that are responsible for the development
of male and female secondary sexual characteristics. Hormones from which
gland stimulate testes and ovaries to secrete their respective
hormones? Tick the right answer.
A. Thyroid
B. Pancreas
C. Adrenal gland
D. Pituitary gland
Q 10: Use the following information to answer the next question. (2 marks)
The first menstrual flow in females is termed as _____i_____. It begins at ____ii______.
The information in which alternative completes the given statement? (Tick the right one)
A.
i ii
menarche puberty
B.
i ii
menarche birth
C.
i ii
menopause puberty
D.
i ii
menopause birth
Q 11: Use the following information to answer the question. (2 marks)
Meena’s
mother has delivered a baby boy. She is very excited but wonders how
eggs get converted into a baby boy or a baby girl. Meena approaches her
teacher and asks her about this matter. The teacher tells her that there
are two types of sex chromosomes: X and Y. The fusion of these sex
chromosomes through gametes leads to the birth of a baby boy or a baby
girl.
A baby boy is born when a sperm containing (Tick the right answer - A or B or C or D):
A. X chromosome fuses with an egg containing X chromosome
B. Y chromosome fuses with an egg containing X chromosome
C. X chromosome fuses with an egg containing Y chromosome
D. Y chromosome fuses with an egg containing Y chromosome
Q 13: Use the following information to answer the next question. (1 mark)
_____i_____ and _____ii_____ are iron-rich food items that promote blood formation. Hence, they are essential for adolescents.
The information in which alternative completes the given statements? Tick the right one.
A.
i ii
Spinach Rice
B.
i ii
Wheat Gram
C
i ii
Gram Spinach
D
i ii
Spinach Cabbage
Q 14: Tick the right answer (A,B,C,D). Which of the following food items is not a part of a balanced diet? (1 mark)
A. Boiled rice
B. Soft drinks
C. Fruit juice
D. Cooked cereal
Q 16: Tick the right answer. (1 mark)
AIDS is a disease that weakens the ability of the body to fight against diseases. Which organism causes AIDS?
A. Virus
B. Bacteria
C. Fungi
D. Protozoa
Q 17: Tick the right answer. (1 mark)
Which of the following statements about AIDS is incorrect?
A. It is caused by virus
B. It is a sexually transmitted disease
C. It can be transmitted by eating food with an infected person
D. It can be transmitted from one person to another by sharing syringes
Question 18: Define the following. (2 marks x 2 = 4 marks)
(i) Adolescence
(ii) Puberty
Question 19: What are secondary sexual characters? Explain in brief. (2 marks)
Question 20: Write about the role of adrenaline hormone in humans. (2 marks)
Question 21: What voice pattern changes happen in boys and girls during puberty? (2 marks)
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