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How to Attempt English Paper Class 10? How to write a Story in English Exam Class 10? Which Book is Best for English Class 10? Which section to attempt first in English Board Exam Class 10? How to Study Social Science in Class 10? Accessible to everyone at any time anywhere without any difficulty. So mastering these solutions will definitely help students to score good marks in the examination. Choose Chapters. Have an account? Sign In. Verify mobile number. Set Password.
Sign In Reset Password. Sign In Kindly Sign up for a personalized experience. New to TopperLearning? State their function. Answer: The hormones which help and control the formation of secondary sexual characters are called sex hormones. They are named so because they control the sexual activities and are secreted by males and females separately.
Functions of sex hormones are given below separately: Male sex hormone: It is also called testosterone. It is secreted by testes and causes changes in secondary sexual character of boys like growth of facial hair like moustache, beard, etc. It also stimulates spermatogenesis. Female sex hormone: It is also called estrogen. It is secreted by ovaries and controls the secondary sexual characters in females, appearance of mammary glands, etc.
It also maintains pregnancy. Question 7. Choose the correct option. Answer: a ii b i c ii. Question 8. For example, in girls, breasts and in boys, facial hair, i. All human beings have 23 pairs of chromosomes in the nuclei of their cells.
Two chromosomes out of these are sex chromosomes. A female has two X chromosomes, while a male has one X and one Y chromosome. The gametes egg and sperm have only one set of chromosomes.
The unfertilised egg always has one X chromosome. But sperms are of two kinds�One having X chromosome, and the other having Y chromosome. When a sperm containing X chromosome fertilises the egg, the zygote would have two X chromosomes and develop into a female child. If the sperm contributes a Y chromosome to the egg or ovum at fertilisation, the zygote would develop into a male child.
It is thus also clear that the sex chromosomes of the father determine the sex of an unborn baby. Question 9. Word game: Use the clues to work out the words. Across: 3. Protruding voice box in boys 4. Glands without ducts 7. Endocrine gland attached to brain 8. Secretion of endocrine glands 9. Pancreatic hormone Female hormone Down: 1. Male hormone 2.
Secretes thyroxine 3. Another term for teenage 5. Hormone reaches here through blood stream 6. Voice box 7. Term for changes at adolescence Answer:. Question 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? Answer: From the above graph, we conclude that initially boys grow faster than girls from years, and girls grow faster than boys from years.
But both reach their maximum height at the age of Here boys show a greater increase in height than girls. The figures in columns 2 and 3, give the percentage of the height a person has reached at the age given in column 1. These figures are only representative and there may be individual variations. Use the Table for your friends and work out how tall they are likely to be.
Find out who is likely to be the tallest and who might be the shortest in your class. Using the formula you can calculate your present height.
Use the data given in Activity Take age on the X-axis and per cent growth in height on the Y-axis. Highlight the point representing your age on the graph. Find out the percentage of height you have already reached. Calculate the height you might eventually reach. Tally your graph with the one given here Fig. Solution: You will notice that initially, girls grow faster than boys but by about 18 years of age, both reach their maximum height.
The rate of growth in height varies in different individuals. Some may grow 10th Ncert Chemistry Solutions Trading suddenly at puberty and then slow down, while others may grow gradually. You can also look for this information on the internet. Solution: Iodine is necessary for the thyroid gland to produce thyroxine hormone.
It regulates the metabolism of carbohydrates, fats and proteins, so as to produce the best balance for the growth. Deficiency of iodine in our diet leads to reduction in the formation of thyroxine hormone causing goitre disease. Write down the items of food in your breakfast, lunch and dinner you had on the previous day.
Identify the items responsible for proper growth. Also identify the junk food that you consumed the previous day. Solution: Do it yourself. Prepare charts or posters and paste them in the class so that you are aware of the diet for adolescents. You may use your creative ideas and present it like an advertisement.
You may even organise a competition on this topic. Solution: You have already studied about food and its components and you are aware of the importance of various ingredients of food like vitamins, proteins, carbohydrates, fats, minerals, water, etc. So you can do this activity yourself. Did you notice any difference in their fitness and health?
Prepare a report on the benefits of regular exercise. Solution: Doing exercises daily keeps one fit and healthy. You can collect data on the number of children in your class who do exercise regularly and who do not. You will notice the difference clearly in their fitness and health. Also, prepare a note on the benefits of regular exercise. What is the other name for duct gland?
Answer: Exocrine glands. Name two duct glands. Answer: Tear glands and sweat glands. What are ductless glands? Answer: Ductless glands are those glands, from which the hormones are directly poured into 10th Ncert Chemistry Solutions Group the blood.
Name any two ductless glands. Answer: Pituitary gland and thyroid gland. Define hormones. Name a gland whose size gets reduced as the child grows older. Answer: Thymus gland. Which gland secretes the hormone thyroxine? Answer: Thyroid gland. Which gland is known as the master gland? Answer: Pituitary gland. Name the female sex hormone and where is it produced?
Answer: Estrogen is produced in the ovary. Name the male sex hormone and where is it produced? Answer: Testosterone is produced in the testes. What is the main function of the sex hormones? Answer: The main function of sex hormones is to control sexual characteristics. Name the sex glands in male and female. Answer: The sex glands are testes in male and ovaries in female.
Apart from estrogen, name the other female hormone secreted by ovaries. Answer: Progesterone. Which gland is responsible for the fatness in the body? Which hormone causes sweating under fear? Answer: Adrenalin. What do you understand by puberty? Answer: The age at which girls and boys attain reproductive maturity is known as puberty. Which is the age of adolescence? Answer: The period of development from childhood to womanhood or manhood is the period of adolescence.
Where are hormones made in the human body? Answer: Endocrine or ductless glands. What is menarche? Answer: The first menstrual flow is known as menarche. Which is the prescribed marriageable age for boys and girls?
Answer: Marriageable age for girls is 18 years and for boys is 21 years. Which gland activates all other endocrine glands? When does puberty end? Answer: Puberty ends when an adolescent reaches reproductive maturity.
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