What do you understand by X and Y chromosomes ? (iii) adolescents feel hungry all the time. (iii) body weight increases. In boys the voice changes due to better growth of larynx, which protrudes on the throat forming Adamâs apple. (a) utility (b) value (c) quantity, (ii) Which one of the following is a human made resource? 8. Rotation is the movement of the earth on its axis. An adolescent covers individuals from These solutions for Man Made Materials are extremely popular among Class 8 students for Science Man Made Materials Solutions come handy for quickly completing your homework and … A female has two X chromosomes, while a male has one X and one Y chromosome. Answer: Question 3. Prepare a report on the benefits of regular exercise. Topics and Sub Topics in Class … (a), Question 7. (a) 11-13 years Testimonials from Dronstudy experienced students proclaim that the notes are designed to be result oriented. All Crop Production and Management Exercise Questions with Solutions to help you to revise complete Syllabus and Score More marks. Answer: X chromosome stands for female and Y chromosome for male character. Thus, human resources are important. Down: CBSE Notes CBSE Notes Class 8 Social NCERT Solutions Social. Answer: Answer: The child is also afraid of scolding. Answer: Question 2. It occurs once in 28 to 30 days. You may even organise a competition on this topic. What are sex hormones? This causes bleeding in women. All rights reserved. In Indian society, girls are considered a burden. Difference : In boys, moustaches and beard appear due to growth of facial hair. Answer: But both reach their maximum height at the age of 20. What is the function of Follicle Stimulating Hormone (FSH) from pituitary ? Answer: Answer: AIDS can be transmitted by-, Question 1. (iii) What is shifting cultivation? Thymus gland. Two chromosomes out of these are sex chromosomes. NCERT science book class 8 acts as a stepping stone for further higher classes where u might feel that the topic is out of your league and hard to comprehend. Yes, the height of a person depends on the genes inherited from his parents. (c) Sex determination in the unborn baby. Name the sex glands in male and female. A balanced diet during adolescence helps in proper development of reproductive organs and a beautiful body. Where is each gland located ? As per the concepts and knowledge of the subject included in the NCERT textbooks for Class 5, the solutions have been prepared so that your child can refer to them for the correct answers. Controlling the growth of population is important because it is difficult to provide food, shelter and other necessities of life for a large population. Answer: Land,Soil, Water, Natural Vegetation and Wildlife Resources. The following changes take place both in boys and girls : Question 2. What will be the sex of the baby developing from XX zygote ? Glands without ducts Answer: Shoulders become broader and muscles grow more prominently in boys. Topics and Sub Topics in Class 8 ScienceÂ Chapter 10 Reaching The Age of Adolescence: Question 1. Ignorance â many people do not know the various methods available. Answer: Question 6. It is the Period between 11 to 19 years There are also other physical and … Give function of each secretion. Also due to ill treatment by family members, many social groups kill their daughters. Share 1. Sexual reproduction. 3. Write down the items of food in your breakfast, lunch and dinner you had on the previous day. Make a group with your friends. Answer: Why is menstruation also known as âperiodâ ? (a), Question 4. (i) Why are resources distributed unequally over the earth? It also stimulates spermatogenesis. Also, prepare a note on the benefits of regular exercise. Answer: (c) The right meal for adolescents consists of: Doing exercises daily keeps one fit and healthy. Insulin which helps to reduce blood glucose level and maintains the sugar level. Question 32. What do you understand by puberty ? Pituitary glandÂ Â Â Â Â Â Â Â beneath the brain. Answer: The stage in the life of a woman when the menstruation stops. Protruding voice box in boys Solution: Name a gland whose size gets reduced as the child grows older. Download a PDF of free latest Sample questions with solutions for Class 8, Science, CBSE- Light . In girls, the regions below the waist becomes wider. (a) They secrete enzymes which come out through ducts. They are named so because they control the sexual activities and are secreted by males and females separately. About Mrs Shilpi Nagpal. In girls, there is more growth in the body parts below the waist. Answer: Distinguish between exocrine and endocrine glands : Question 4. 4. In girls, oestrogen makes the breasts develop with milk secreting glands inside. 1 ; View Full Answer An … Adamâs apple is observed in Question 7. (a), Question 9. Answer: Sex glandÂ Â Â Â Â Â Â Â Â Â Â Â Â testes in males and ovaries in females. This is to receive the zygote. Answer: 8. speed of light in the glass ⇒speed of light in glass = 2 × 10. Question 3. Also identify the junk food that you consumed the previous day. Testosterone in boys is produce from secretion of What name is given to the period when a person is neither a child nor an adult ? Prepare charts or posters and paste them in the class so that you are aware of the diet for adolescents. Question 8. What conclusions can be drawn from these graphs? (i) Why are resources distributed unequally over the earth? In amphibians, metamorphosis is done by NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12. Define terylene - Science - Synthetic Fibres and Plastics. (d) 08 days [NCERT] Pituitary GlandÂ Â Â Â Â Â Â Â Â Â Growth hormone, Thyroid GlandÂ Â Â Â Â Â Â Â Â Â Thyroxine and calcitonin, Parathyroid GlandÂ Â Â Â Â Â Â Parathyroid hormone, Adrenal GlandÂ Â Â Â Â Â Â Â Â Â Adrenalin, PancreasÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Glucagon and insulin. NCERT Solutions for Class 8 Maths will help you to ace the unsolved problems in the maths book prescribed by the CBSE. Give some myths about sex life prevailing in our society ? Activity 1 (NCERT Textbook, Page 114) The following chart gives the average rate of growth in height of boys and girls with age. Question 2. Answer: Thus the resources are distributed unevenly all over the earth. NCERT solutions for class 8 9 10 11 12. If the sperm contributes a Y chromosome to the egg or ovum at fertilisation, the zygote would develop into a male child. Prepare a table having two columns depicting names of endocrine glands and hormones secreted by them. The hormones which help and control the formation of secondary sexual characters are called sex hormones. (i) proper diet develops their brains. (d) vitamin B-complex Tribals, Dikus and the Vision of a Golden Age, 6. Civilising the “Native”, Educating the Nation, 9. (a) medicines to treat cancer (b) spring water (c) tropical forests, (iii) Complete the statement. Question 3. Therefore, these twins are identical and are of the same sex. Answer: Question 13. (c) pituitary gland The Making of the National Movement: 1870s – 1947, 6. Terylene is used for making dress materials. The knowledge and the ability of each person differs. (b) calcium NCERT Solutions for Class 8 Social Science, NCERT Solutions for class 8 Civics, The Indian Constitution- Class 8th NCERT Solutions Social and Political Life, Chapter 1 - The Indian Constitution - NCERT - Class 8 – Civics, NCERT Solutions for Class 8th: Ch 1 The Indian Constitution Civics, Class VIII Social and Political Life Notes … (c) 18 days (i) menstruation starts. It is very important for the students to get well versed with this NCERT Exemplar as it will aid them in gaining complete knowledge of the concepts included in Class 8 … Filed Under: Class 8, NCERT Solutions, Science Tagged With: Chapter 6, class 8, Combustion and Flame, NCERT Solutions, science. Answer – The resources are unequally distributed over the earth due to their natural or man made occurrence. Question 5. Name a gland which is exocrine as well as endocrine gland. They are a result of double fertilisation â fertilisation of two ova from two sperms. When a sperm containing X chromosome fertilises the egg, the zygote would have two X chromosomes and develop into a female child. Then they may feel like taking drugs. The NCERT Solutions to the questions after every unit of NCERT textbooks aimed at helping … Here on AglaSem Schools, you can access to NCERT Book Solutions in free pdf for Science for Class 8 so that you can refer them as and when required. Endocrine or ductless glands. Which hormone causes sweating under fear ? Identify the items responsible for proper growth. (i) Which one of the following does NOT make substance a resource? All human beings have 23 pairs of chromosomes in the nuclei of their cells. © 2020, Arinjay Academy. [NCERT] Answer: . Use the data given in Activity 10.1 to draw a graph. NCERT Solutions for Class 8 Civics Chapter 4 – Understanding Laws – NCERT Exercises. Author of this website, Mrs Shilpi Nagpal is MSc (Hons, Chemistry) and BSc (Hons, Chemistry) from Delhi University, B.Ed (I. P. University) and has many years … (d) none of these Define terylene. Glucagon and insulin are secreted by pancreas. Answer 1:-Rule of law states that all people are equal before the law … The earth takes 24 hours to complete one rotation. This helps protect the nature and not allow the depletion of resources rapidly. Acquired Immuno Deficiency Syndrome. When we are under stress or angry, the hormone which helps us to adjust, is Which is the age of adolescence ? Pancreatic hormone Pancreas. In boys moustache and beard appear. Male sex hormone: It is also called testosterone. (b) adrenaline Answer: Activity 4 (NCERT Textbook, Page 121) Here you can read Chapter 15 of Class 8 Science NCERT Book. Give the similar changes taking place in both boys and girls during adolescence. Question 25. Answer: Question 10. (i) What is agriculture? (a) vitamin A (a) boys Explain. (c) both boys and girls Download NCERT Solutions 2020-2021 along with NCERT Books for other subjects also. Take age on the X-axis and per cent growth in height on the Y-axis. Answer: (iv) height increases. What is the term used for secretions of endocrine glands responsible for changes taking place in the body? Answer: Question 12. Question 9. What will be the effect of the hormone ? the responsibilities of parenthood should only be taken when you are settled in life. 23 pairs, i.e., 46. Answer: Question 7. ParathyroidÂ Â Â Parathyroid Hormone (b) pituitary gland Name the endocrine gland and the hormone which. → Examples of condensation polymer are nylon-66, terylene etc. Reaching the Age of Adolescence Class 8 Science NCERT Intext Activities Solved. Acrylic → It is relatively cheaper than … Question 8. The voice of boys becomes hoarse and deep but the voice of girls become shrill but sweet during adolescence. In your response include a fictitious or real example of a violation of the rule of law. Answer: Identical twins come from the same ovum. Answer: Question 5. Distinguish between exocrine and endocrine glands. Answer: Question 5. We hope the given CBSE Class 8 … Answer: (a) adrenal gland Marriageable age for girls is 18 years and for boys is 21 years. (b), Question 10. List changes in the body that take place at puberty. Menopause is the stoppage of menstruation in woman. Puberty ends when an adolescent reaches reproductive maturity. Answer: Due to this there will be heavy sweating and lowering of body temperature. You can also get complete NCERT solutions and Sample papers. Pituitary gland secretes which hormone from ovaries in girls Terylene: Terylene is a popular polyester. Secretes thyroxine In boys, the voice box tends to protrude out on the upper part of the neck, below the chin and is often referred to as Adamâs apple. NCERT Solutions for Class 8 Maths in PDF format provided by Vedantu are solved by subject expert teachers carefully from the latest edition books and as per NCERT (CBSE) guidelines. Collect information from magazines or from doctors and prepare a note on the importance of consuming iodised salt. 1. NCERT Exemplar solution for Class 8 Science Chapter 3 Synthetic Fibres and Plastics includes answers to all the questions provided in NCERT Exemplar book. The spurt in physical growth is evident in girls between [NCERT] Question 30. The period of development from childhood to womanhood or manhood is the period of adolescence. Name any two ductless glands. Sexual contact with another HIV infected person. Answer: Killing of the female foetus in the motherâs womb is known as female foeticide. (iv) vegetable cutlets, chips and lemon drink. Ductless glands are those glands, from which the hormones are directly poured into the blood. 10.2). (b) adrenal gland It regulates the metabolism of carbohydrates, fats and proteins, so as to produce the best balance for the growth. Answer: It is the judgemental use of all the resources. Define adolescence. How are identical twins formed ? → Common polyester includes terylene and PET → PET is used for making utensils, films, wires, bottles, etc. Another term for teenage Define hormones. Answer: Activity 3 (NCERT Textbook, Page 120) Question 40. Sexual contact by adolescents should be avoided because : Question 8. Find NCERT textbook questions and answers for cbse Class class 8 9 10 11 12. CBSE class 8 science notes are broadly classified into Chemistry, Biology and Physics. May 8, 2020. Define rotation and revolution. A hormone which helps to balance the suger in the body. (b), Question 5. In the class 8 Science chapter 18 Pollution of air and water, various pollutants of air pollution and water pollution along with the important chapter … Free PDF download of Class 8 Maths NCERT Solutions help students to understand and learn the chapters easily and score more marks in … (c) thyroid gland Answer: Question 9. The two modes mentioned above are explained along with suitable … Just by touching a boy, the girl will get pregnant. (c) Sex determination in the unborn baby: The sex of a child, i.e., whether it is a male or a female is determined at the time of fertilisation when a male gametes fuse with a female gamete. At which age does menopause takes place ? (ii) Name the factors influencing agriculture. Class-8 » Science. Similarity : In both boys and girls hair start to grow in arm pits and the pubic region above the thighs. NCERT Exemplar for Class 8; NCERT Exemplar for Class 8… Answer: 6. These change may be listed as below: Question 5. How can the population be controlled ? Answer: (c) thyroxine Thus, the voice becomes deep and hoarse. Pituitary gland. The unfertilised egg always has one X chromosome. Class 8 - CBSE Board - - LearnNext offers animated video lessons with neatly explained examples, Study Material, FREE NCERT Solutions, Exercises and Tests. 9. Male hormone Question 7. (% of full height at this age = 77%). Solution: (a) thyroid gland Thyroid gland. Answer: Hormone reaches here through blood stream Question 35. Which gland activates all other endocrine glands ? (b) Reproductive age in women starts when their: This is called menstruation. Estrogen is produced in the ovary. Polyester → Fabric made from polyester does not get wrinkled easily. How should the adolescents take care of their health ? How many chromosomes are present in the nucleus of a single egg ? Explain. Answer: Answer: Answer: 10.3. Home » Geography » NCERT Solutions for Class 8 Geography Chapter 1 – Resources, NCERT Solutions for Class 8 Geography Chapter 1 – Resources. Activity 6 (NCERT Textbook, Page 122) The rate of growth in height varies in different individuals. Question 6. (c) Vitamin C The sex of the baby is determined by the XX and XY chromosomes in a zygote. Teenagers. (d) parathyroid gland Once a girl starts menstruating, her body needs more Answer – Sustainable development is a practice where you use resources in a judgemental and wise way, so that the future generations can also use the resources. Personal hygiene should be maintained by taking bath daily. Class 8 Science Chapter 3 Important Questions are given below updated for new academic session 2020-21. (a) Adolescents should be careful about what they eat, because: Furthermore topics are divided into respective chapters for easy referencing for students. Apart from estrogen, name the other female hormone secreted by ovaries. What is menarche ? Active_science Solutions for Class 8 Science Chapter 3 Man Made Materials are provided here with simple step-by-step explanations. What is âfemale foeticideâ ? NCERT Solutions for Class 5 are provided here on this page for all the subjects included in the NCERT academic curriculum. Functions of sex hormones are given below separately: Answer: Sex glands. What is menopause ? 8. m s –1. Answer: Some may grow suddenly at puberty and then slow down, while others may grow gradually. In case it is fertilized, it begins to develop. Scroll down for Some Natural Phenomena from NCERT Book Class 8 … Question 24. [NCERT] Unit Number 319, Vipul Trade Centre, Sohna Road, Gurgaon, Sector 49, Gurugram, Haryana 122018, India, Monday – Friday (9:00 a.m. – 6:00 p.m. PST) Saturday, Sunday (Closed), 4. Offline Apps and NCERT Solutions 2020-2021 of other … Name the male sex hormone and where is it produced ? (v) Name the fibre crops and … Class 8 Geography Chapter 4 Agriculture Ncert Textbook Questions Solved. What are its disadvantages? Question 6. Answer the following questions. Which gland is known as the master gland ? (b) girls Here boys show a greater increase in height than girls. What is the difference in the voice of boys and girls during adolescence ? Free PDF download of NCERT Solutions for Class 8 Science (Biology) Chapter 1 - Crop Production and Management solved by Expert Teachers as per NCERT (CBSE) Book guidelines. Answer: Adolescents should be careful about what they eat, because. Question 9. EndocrineÂ Â Â Â Â Â Â Â Â Â Â Gland Hormone. Name the female sex hormone and where is it produced ? Question 1. Answer: A girl should not handle food duration menstruation. Prepare a table having two columns depicting names of endocrine glands and hormones secreted by them. NCERT Solutions for Class 8 breaks down the solutions into detailed steps to increase your score in exams. Answer: Term for changes at adolescence When X and X chromosomes form zygote (XX) the baby is female. Question 18. please refer to her. Answer: (b) 12-18 years [NCERT] 3. Question 1:-Write in your own words what you understand by the term the ‘rule of law’. Question 11. A large number of family welfare centres have been set-up to educate the people on family planning. Question 28. The gametes (egg and sperm) have only one set of chromosomes. Here are NCERT Exemplar Problems and Solutions for Class 8 to help the students understand the type of questions and the appropriate answers for these. What is the other name for duct gland ? You may use your creative ideas and present it like an advertisement. Question 17. During adolescence one should take care of personal health and hygiene. Answer: Question 9. Using the formula you can calculate your present height. Full height in cm = (110*100) / 77 What do you think is the main difference in the boys and girls of your class ? (iv) taste buds are well developed in teenagers. Across: Download free PDF of best NCERT Solutions , Class 8, Science, CBSE- Reaching the age of Adolescence . (a), Question 6. (a) insulin The first menstrual cycle is known as menarche. 1. Activity 5 (NCERT Textbook, Page 121) Detailed answers and explanations provided in this study material will help you with different aspects of body movements, which is very important to understand Anatomy topics in future classes.
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