Which of these hormones is secreted by endocrine gland located on the top of kidneys?
- ✓Adrenaline.
- BInsulin.
- CProgesterone.
- DTestosterone.
Answer: A.
View full solution →Question types
Reaching the Age of Adolescence question types
462 questions across 10 question groups — pick any mix to generate a Science paper with step-by-step answer keys.
462
Questions
10
Question groups
5
Question types
01
M.C.Q. [I MARKS]
221 Q→02differences [2marks]
2 Q→03Fill in the blanks: [1 M]
13 Q→04questions in short. [2 marks ]
56 Q→05scientific reasons[2 marks ]
12 Q→06true or false. [1 M]
25 Q→07questions in short. [3 marks ]
22 Q→08questions in details [4 marks ]
35 Q→09questions in on sentence. [1 M]
73 Q→10case /data -based (4 Marks)
3 Q→Sample Questions
Reaching the Age of Adolescence questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
The unfertilised egg always has $..............$ chromosome:
- ✓$X$
- B$Y$
- C$XY$
- D$XX$
Answer: A.
View full solution →The most conspicuous visible change that occurs in boys during puberty is:
- ADevelopment in the voice box.
- ✓Increase in height.
- CProduction of sperms.
- DIncreased sweating.
Answer: B.
View full solution →Structures present in a cell which is responsible for determination of the sex of a baby is:
- ACytoplasm.
- BNucleus.
- CCell membrane.
- ✓Chromosome.
Answer: D.
View full solution →Direction: Answer the questions from $3$ based on the graph given below. When does adolescence occur?
- A$0$ to $3$ years
- B$3$ to $13$ years
- ✓$11$ to $18$ years
- D$18$ to $45$ years
Answer: C.
View full solution →Give points of differences: Male sex hormone and Female sex hormone
Give points of differences: Male secondary sex characters and Female secondary sex characters
Fill in the following blanks with suitable words: Each normal body cell in humans contains $............$ pairs of chromosomes out of which $............$ pair is of sex chromosomes.
View full solution →Fill in the following blanks with suitable words: $X$ and $Y$ chromosomes are called $............$ chromosomes.
View full solution →Fill in the following blanks with suitable words: Early marriage and motherhood cause health problems in the $............$ and the $............$
View full solution →Fill in the following blanks with suitable words:
Initially, girls grow $............$ than boys.
View full solution →Initially, girls grow $............$ than boys.
Fill in the following blanks with suitable words: The protective foods are $............$ And $............$
View full solution →What are sex hormones? Name two sex hormones.
It is advised to include physical exercise in daily routine. Give reason.
What is puberty? Who attains puberty at an earlier age in human beings: male (boy) or female (girl).
What is Adam’s Apple? Which of the two usually have an Adam’s Apple: grown up boys or grown up girls?
It was observed that the tadpoles are not growing into adult frogs in a village pond. $A$ scientist who was asked to find the reason for this concluded that the pond water did not contain sufficient amount of a mineral $P$ which could make a hormone $Q.$ The hormone $Q$ can causes a phenomenon $R$ in tadpoles so that they become adult frogs.
$a.$ What are $(i)\ P\ (ii)\ Q$ and $(ii)\ R?$
$b.$ Name one human disease which can also be caused due to the deficiency of $P$ in the food and water.
View full solution →$a.$ What are $(i)\ P\ (ii)\ Q$ and $(ii)\ R?$
$b.$ Name one human disease which can also be caused due to the deficiency of $P$ in the food and water.
Why we should not take medicines or drugs unless prescribed by a doctor?
John and Radha were classmates since childhood. When Radha became eleven years old, she developed a little swelling on her neck. She visited the doctor who started medication for her. After a few years, John also developed a slight protrusion on his throat. He got worried and went to the doctor. But, the doctor assured him that it was a normal feature in boys while they are growing up. Can you think of any reasons for the difference in diagnoses?
Is a woman responsible for the birth of a girl child$?$ Explain.
View full solution →It is said that height of a child depends upon the genes inherited from the parents. Are there factors other than genes that causes variation in height?
One day Seema’s uncle visited her place. Seema prepared dinner for him. When she was about to put rock salt on the salad, her uncle interrupted her and asked to put iodised salt instead of rock salt. He also advised her to prefer iodised salt instead of rock salt. Why do you think Seema’s uncle advised her to have iodised salt instead of rock salt?
Menopause is the stage when menstruation starts.
When the zygote has one $X$ and one $Y$ chromosome, a male child is developed.
View full solution →At puberty, the voice box or the larynx begins to grow.
The unfertilised egg has two $X$ chromosomes.
View full solution →The gametes have only one set of chromosomes.
Prepare a table having two columns depicting names of endocrine glands and hormones secreted by them.
What is menstruation? Explain.
Define adolescence. State some of the change which take place in boys and girls during adolescence.
The table below shows the data on likely heights of boys and girls as they grow in age. Draw graphs showing height and age for both boys and girls on the same graph paper. What conclusions can be drawn from these graphs?
View full solution →| Age (Years) | Height (cm) | |
| Boys | Girls | |
| $0$ | $53$ | $53$ |
| $4$ | $96$ | $92$ |
| $8$ | $114$ | $110$ |
| $12$ | $129$ | $133$ |
| $16$ | $150$ | $150$ |
| $20$ | $173$ | $165$ |
What is meant by the ‘primary sexual characteristics’ in humans? State two primary sexual characteristics in boys and two in girls.
Sex determination in an unborn baby:
Secondary sexual characters.
Adam’s apple.
Name two food items each which provide mainly:
$i.$ Carbohydrates for energy.
$ii.$ Fats for energy.
$iii.$ Proteins for growth.
$iv.$ Vitamins and minerals for good health.
View full solution →$i.$ Carbohydrates for energy.
$ii.$ Fats for energy.
$iii.$ Proteins for growth.
$iv.$ Vitamins and minerals for good health.
Fill the blank circles in figure and identify the sex of child $A$ and $B.$
View full solution →The right meal for adolescents consists of.
- Achips, noodles, coke.
- ✓chapatti, dal, vegetables.
- Crice, noodles and burger.
- Dvegetable cutlets, chips and lemon drink.
Answer: B.
View full solution →Adolescents should be careful about what they eat, because.
- Aproper diet develops their brains.
- ✓proper diet is needed for the rapid growth taking place in their body.
- Cadolescents feel hungry all the time.
- Dtaste buds are well developed in teenagers.
Answer: B.
View full solution →What is the term used for chemical secretions of endocrine glands responsible for changes taking place in the body?
What is acne?
Give a suitable word for each of the following statements. It marks the beginning of reproductive period.
Diabetes is a condition in which the blood sugar level of a person rises above the normal level.
The table below shows the average range of blood sugar levels at fasting.
Doctors prescribe insulin injection for patients with high blood sugar levels. However, glucagon is injected in an emergency if the blood sugar level of a person drops too low.
$9.$ Which of these is true about the gland secreting insulin in the human body$?$
$A.$ It has no ducts.
$B.$ It is located on the skin.
$C.$ It controls the function of all other glands.
$D.$ It releases hormones that help in growth.
$10. $ Under what conditions of blood sugar level is glucagon likely to be injected$?$
$A.$ below $60$ mg/dL
$B. 80–100$ mg/dL
$C. 100–120$ mg/dL
$D.$ above $120$ mg/dL
View full solution →The table below shows the average range of blood sugar levels at fasting.
| Low blood sugar level | Normal blood sugar level | High blood sugar level (diabetes) | |
| Blood sugar level at fasting | below $70$ mg/dL | $70 – 120$ mg/dL | above $120$ mg/dL |
$9.$ Which of these is true about the gland secreting insulin in the human body$?$
$A.$ It has no ducts.
$B.$ It is located on the skin.
$C.$ It controls the function of all other glands.
$D.$ It releases hormones that help in growth.
$10. $ Under what conditions of blood sugar level is glucagon likely to be injected$?$
$A.$ below $60$ mg/dL
$B. 80–100$ mg/dL
$C. 100–120$ mg/dL
$D.$ above $120$ mg/dL
Heights of students of four different sections of Grade $8$ are measured. The table shows the
percentage of maximum height up to which the students in each section have grown
$4.$ In which class have both the boys and the girls reached the end of puberty$?$
$A.$ Section $A$
$B.$ Section $B$
$C.$ Section $C$
$D.$ Section $D$
$5.$ What can be concluded from the table$?$
$A.$ Girls are taller than boys in all four classes.
$B.$ Girls attain their maximum height earlier than boys.
$C.$ Girls grow faster than boys throughout their childhood.
$D.$ Girls and boys attain their maximum height at the same age.
$6.$ What is the legal age for marriage in India$?$
$A. 16$ years for a girl and $18$ years for a boy
$B. 18$ years for a girl and $18$ years for a boy
$C. 18$ years for a girl and $21$ years for a boy
$D. 21$ years for a girl and $21$ years for a boy
$7.$ Why should syringes be disposed of carefully after use$?$
$8.$ Under which condition does metamorphosis take place$?$
$A.$ Females are twice the size of males.
$B.$ Young ones look different from adults.
$C.$ Young ones eat the same food as adults.
$D.$ Females are bright-coloured while males are dull.
View full solution →percentage of maximum height up to which the students in each section have grown
| Section | Girls | Boys |
| $A$ | $80\%$ | $75\%$ |
| $B$ | $100\%$ | $100\%$ |
| $C$ | $92\%$ | $85\%$ |
| $D$ | $100\%$ | $98\%$ |
$A.$ Section $A$
$B.$ Section $B$
$C.$ Section $C$
$D.$ Section $D$
$5.$ What can be concluded from the table$?$
$A.$ Girls are taller than boys in all four classes.
$B.$ Girls attain their maximum height earlier than boys.
$C.$ Girls grow faster than boys throughout their childhood.
$D.$ Girls and boys attain their maximum height at the same age.
$6.$ What is the legal age for marriage in India$?$
$A. 16$ years for a girl and $18$ years for a boy
$B. 18$ years for a girl and $18$ years for a boy
$C. 18$ years for a girl and $21$ years for a boy
$D. 21$ years for a girl and $21$ years for a boy
$7.$ Why should syringes be disposed of carefully after use$?$
$8.$ Under which condition does metamorphosis take place$?$
$A.$ Females are twice the size of males.
$B.$ Young ones look different from adults.
$C.$ Young ones eat the same food as adults.
$D.$ Females are bright-coloured while males are dull.
An ovum contains one $X$ chromosome.
A sperm contains an $X$ or a $Y$ chromosome.
A sperm can fertilize an ovum to produce two different zygotes.
$1.$ Which chromosome does the female zygote receive from the mother and the father$?$
$2.$ In which body part of a woman does a fertilized ovum get embedded$?$
$3.$ Which of these statements is supported by the picture$?$
Circle ‘Yes’ or ‘No’ for the correct response.
View full solution →A sperm contains an $X$ or a $Y$ chromosome.
A sperm can fertilize an ovum to produce two different zygotes.
$1.$ Which chromosome does the female zygote receive from the mother and the father$?$
| Mother | Father | |
| $A.$ | $X$ chromosome | $Y$ chromosome |
| $B.$ | $Y$ chromosome | $X$ chromosome |
| $C.$ | $X$ chromosome | $X$ chromosome |
| $D.$ | $Y$ chromosome | $Y$ chromosome |
$3.$ Which of these statements is supported by the picture$?$
Circle ‘Yes’ or ‘No’ for the correct response.
| Is this Statement Supported by the Picture$?$ | Yes or No |
| The father’s sperm decides the gender of the zygote. | Yes/No |
| The $Y$ chromosome is shorter than the $X$ chromosome. | Yes/No |
| An ovum unites with two sperms at a time | Yes/No |
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