Class 8 Science Chapter 7 MCQ (Multiple Choice Questions) of reaching the Age of Adolescence updated for academic session 2024-25. All the MCQs are important for the school unit tests as well as terminal or periodic exams. Practice here MCQ online test with answers and explanation of each questions to prepare the chapter and become confident in all topics of chapter 7 of class 8 science. These MCQ quiz covers the complete chapter 7 reaching the Age of Adolescence from CBSE class viii science.

Class 8 Science Chapter 7 MCQ

Class: 8Science
Chapter: 7Reaching the Age of Adolescence
Contents:MCQ Online Test with Explanation

MCQ Tests with Answers for Class 8 Science Chapter 7


The belief that the mother is completely responsible for the sex of the child is wrong because the child:

[A]. Gets sex chromosome only from the mother.
[B]. Develops in the body of the mother.
[C]. Gets one sex chromosome from the mother and the other from the father.
[D]. Gets sex chromosome only from the father.

AIDS can spread from an infected person to another person through:

[A]. Sharing food
[B]. Blood transfusion
[C]. Sharing comb
[D]. A mosquito bite

For the metamorphosis of tadpoles which of the following elements must be available in water?

[A]. Chlorine
[B]. Carbon
[C]. Sulphur
[D]. Iodine

The most conspicuous visible change that occurs in boys during puberty is:

[A]. Development in the voice box.
[B]. Increase in height.
[C]. Production of sperms.
[D]. Increased sweating.

Structures present in a cell which is responsible for determination of the sex of a baby is:

[A]. Cytoplasm
[B]. Cell membrane [C]
[C]. Nucleus
[D]. Chromosome

Reproductive age in women starts when:

[A]. Menstruation Starts
[B]. Breasts start developing
[C]. Body weight increases
[D]. All the above.

Reproductive phase in females is form the age of:

[A]. 10 – 12 years to 40 – 45 years.
[B]. 18 – 21 years to 30 – 35 years.
[C]. 21 – 23 years to 40 – 45 years.
[D]. 25 – 30 years to 40 – 45 years.

Priya is writing some statements, choose the correct statement and help her:

[A]. In a frog, metamorphosis is brought about by thyroxine hormone.
[B]. The production of thyroxine hormone requires the presence of iodine in water.
[C]. All the amphibians need thyroxine hormone to undergo metamorphosis and change from larva into adults.
[D]. All the above.

Vikash is doing his homework which is given by his teacher. Would you help him to choose the incorrect sentences?

[A]. Adrenals are endocrine glands.
[B]. Adrenal glands are known as emergency hormone.
[C]. The aldosterone hormone secreted by adrenal glands maintain the correct salt balance in the blood.
[D]. None of the above.

Sex chromosome in female body is or are:

[A]. X
[B]. Y
[C]. XX
[D]. XY

Payel is completed her science chapter where she wrote some statements. She wants to know whether the statements are correct or not? Payel wants to take help from you:

[A]. Thyroid is a large endocrine gland in the neck.
[B]. Thyroid gland makes a hormone called thyroxine which contains iodine.
[C]. The deficiency of thyroxine hormone causes a disease known as “goitre”.
[D]. People are advised to take iodised salt which contains appropriate amount of sodium chloride.

The sex of a child is determined by:

[A]. The presence of an X chromosomes in egg (or ovum)
[B]. The presence of a Y chromosomes in sperm
[C]. The egg of father and mother
[D]. The length of the mother’s pregnancy

Which of the following is a mis-matched pair?

[A]. Adrenaline : Pituitary gland
[B]. Estrogen : Ovary
[C]. Pancreas : Insulin
[D]. Testosterone : Testis

Choose the statement which are incorrect about drugs:

[A]. Drugs are addictive.
[B]. Drugs do physical harm to the body.
[C]. Drug addicts become irritable and lose interest in their studies or jobs.
[D]. Drugs are less powerful chemical substance and it should be used by anyone.

Puja is writing some statements but she confused to know whether the statements are correct or not? If you know the answer to this question, then tell her:

[A]. Regular physical exercise in fresh air keeps the body fit.
[B]. Regular physical exercise also improves the mental health.
[C]. Physical exercise builds and maintains healthy muscles, bones and joints.
[D]. All the above.

In the last year board examination, Rahul were asked a question where he had to choose the statement which was/were correct? Will you be able to answer this question?

[A]. The ovaries start releasing mature eggs or ova at puberty.
[B]. The testes begin to produce male sex cells called “sperms” at puberty.
[C]. Adolescence is the time in one’s life when the brain has the greatest capacity for learning.
[D]. All the above.

In a quiz competition, you are asked a question where you have to choose the statement which is/ are correct?

[A]. A gland which secretes its product into a duct is called an exocrine gland.
[B]. Sweat glands and sebaceous glands or oil glands are exocrine glands.
[C]. A gland which does not have a duct and secretes its product directly into the blood stream, is called an endocrine gland.
[D]. All the above.

The dramatic changes in body features associated with puberty are mainly because of the secretions of:

[A]. Thyroxine and Estrogen
[B]. Estrogen and Adrenaline
[C]. Thyroxine and Adrenaline
[D]. Estrogen and Testosterone

Which of the following can lead to menstruation in a 21-year-old woman during ovulation?

[A]. Sperms available for fertilization and Oviducts blocked
[B]. Oviducts blocked and Sperms not available for fertilization
[C]. Sperms available for fertilization and Sperms not available for fertilization
[D]. Oviducts blocked and Oviducts not blocked

Which of the following is the secondary sexual characteristics in females?

[A]. Low pitched voice
[B]. Broadening of chest
[C]. Broadening of hip
[D]. Developing Adam’s apple

A ten-year-old boy is 125 cm tall. If the present height of the boy is 78% of his full height, calculate the full height which the boy will eventually reach at the end of growth period.

[A]. 150.75
[B]. 160.25
[C]. 147.15
[D]. 163.85

Which of the following statement is or are correct?

[A]. A young human being below the age of full physical development is called a child.
[B]. A mature human being who is fully grown and developed is called an adult.
[C]. The transitional period of physical and mental development which occurs between childhood and adulthood, is called adolescent.
[D]. All the above.

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Last Edited: June 12, 2023