ncert solutions for class 12 biology chapter 3

Question 11: What are the major functions of male accessory ducts and glands? The corpus luteum facilitates the endometrium of the uterus to proliferate and prepare for the process of implantation. The diagram of male reproductive system is as follows: 3. NCERT Solutions for Class 12 Biology Chapter 3 – Human Reproduction. Students can refer to these answers to prepare for the examinations. myCBSEguide provides sample papers with solution, test papers for chapter-wise practice, NCERT solutions, NCERT Exemplar solutions, … Name the hormones involved in regulation of spermatogenesis. 20. It also allows the endometrium of the uterus to proliferate and to prepare itself for implantation. The hormone progesterone assists in maintaining and preparing the endometrium for the process of embryo-implantation. Exercise solution full NCERT Biology class-12. When progesterone is secreted in high levels, the secretion of LH and FSH is inhibited which further prevents ovulation. NCERT solutions for class 12 biology has been designed in such a way that biology – class xii students can take maximum benefit out of it. This happens when two eggs (one from each ovary) are released at the same time and get fertilized by two separate sperms. All the questions given in the exercises from the textbook are answered here. Answer The menstrual cycle is a series of cyclic physiologic changes that take place inside the female reproductive tract in primates. Therefore, one primary oocyte produces one large ovum and three polar bodies which inturn degenerate. What are the major components of seminal plasma? It is because they nourish the germ cells. NCERT Solutions for Class 12 Biology Chapter 12 Biotechnology and its Applications Biotechnology deals with industrial-scale production of biopharmaceuticals. On the other hand, in fraternal twins or dizygotic twins, two eggs are released which are fertilized by two different sperms causing the fraternal twins to exhibit different genetic characters. Answer Parturition is the process of giving birth to a baby as the development of the foetus gets completed in the mother’s womb. Hence, six eggs were released by the ovary of a female dog to produce six puppies. Answer (a) Corpus luteum − Corpus luteum is formed from the ruptured Grafiaan follicle. Answer An ovary releases an egg every month. NCERT Solutions for Class 12 Biology Chapter 3 – Human reproduction is categorized under Unit – Reproduction. 2. We hope the NCERT Solutions for Class 12 Biology Chapter 3 Human Reproduction help you. Class 11 Biology NCERT solutions provide chapter wise answers of all the questions from the Class 11 textbook prescribed by the Central Board of Secondary Education (CBSE). vagina. Secretions of the accessory sex glands of males – prostate gland, seminal vesicles, bulbourethral glands. They also provide nutrients and activate the sperm. The major components of seminal plasma are: 11. NCERT solutions for Class 12 Biology Textbook chapter 3 (Human Reproduction) include all questions with solution and detail explanation. Correct each false statement to make it true. (a) They produce female gametes called ova by the process of oogenesis. On the contrary, human females have 22 pairs of autosomes and contain only the X sex chromosome. They degenerate as they do no participate in reproduction, thus leaving behind one functional ovum. The process of Oogenesis takes place in three phases: 13. 21. The smaller cell is known as the first polar body, while the larger cell is known as the secondary oocyte. It takes place in the ovaries. (k) The structure which provides vascular connection between foetus and uterus is called _______, (f) The process of release of ovum from a mature follicle is called ovulation, (g) Ovulation is induced by a hormone called luteinizing hormone (LH), (h) The fusion of male and female gametes is called fertilization, (i) Fertilisation takes place in ampulla of oviduct. Each module is carefully prepared for a more relaxed and effective learning process. Question 7: Name the hormones involved in regulation of spermatogenesis. These solutions for Human Reproduction are extremely popular among Class 12 Science students for Biology Human Reproduction Solutions come handy for quickly completing your homework and preparing for exams. All links are working. (True/False). If you have any problem in finding the correct answers of Biology Textbook then you can find here. The structure which provides a vascular connection between foetus and uterus is called placenta. Hence, if the sperm carrying ‘X’ fertilizes the ovum (zygote XX), then it would develop into a female baby and if the sperm carrying ‘Y’ fertilizes the ovum (zygote XY), then it would develop into a male baby. Some hormones involved in the regulation of spermatogenesis are as listed below: 8. Spermiation – It is the phenomena where mature spermatozoa are released from the Serotoli cells into the lumen of the seminiferous tubules of the testes. Just adjacent to the seminiferous tubules, there are large polygonal cells referred to as leydig cells or interstitial cells which secrete testosterone – the male hormone. The process occurs in the seminiferous tubules located inside the testes. Get chapter wise solutions. (True/False), (b) Spermatozoa get nutrition from Sertoli cells. And we at CLEAR EXAM want to make it stronger. How many eggs do you think would have been released if the mother gave birth to identical twins? 18. Draw a labelled diagram of a Graafian follicle. NCERT Solutions for Class 12th: Ch 3 Human Reproduction Biology Download Class 12 Biology NCERT Solutions in pdf free. Question 4: Write two major functions each of testis and ovary. FSH secreted under the influence of RH (releasing hormone) from the hypothalamus stimulates the conversion of a primary follicle into a graafian follicle. Maturation phase – The diploid primary oocyte in this phase passes through two maturation divisions. If you have any query regarding NCERT Solutions for Class 12 Biology Chapter 3 Human Reproduction, drop a comment below and we will get back to you at the earliest. It helps one see the bigger and clear picture of the planet and know what happens on the inside of the bodies of various organisms. (a) Androgens are produced by Sertoli cells. It consists of the hyaluronidase enzyme that hydrolyses the outer membrane of the egg which facilitates the sperm to perforate through the egg during fertilization. The phenomena of sperm production from the immature germ cell in males is termed as spermatogenesis. Chemistry NCERT Solutions for Class 12 Chapter 3 Electro chemistry includes all the important topics with detailed explanation that aims to help students to understand the concepts better. Question 18: What is parturition? Download Free NCERT Solutions for Class 12 Biology PDF Chapter wise. The NCERT Biology Books are based on the latest exam pattern and CBSE syllabus. (d) Sperm tail − It is the longest region of the sperm that facilitates the movement of the sperm inside the female reproductive tract. Question 8: Define spermiogenesis and spermiation. It improves the conceptual knowledge of the students. Males are heterogametic – they produce two types of male gametes or sperms, where 50% of the sperms carry the ‘X’ chromosome, while the rest 50% carry the ‘Y’ chromosome. It is a cycle observed to be taking place in females, lasting for around 28 days on an average to complete. Solutions provided are solved skillfully with the use of student-friendly terminologies simultaneously aligning with the standards that are to be followed for solving NCERT solutions for Class 12. The primary spermatocytes furthermore undergo meiotic divisions for the formation of secondary spermatocytes and ultimately spermatids. Question 17: What is menstrual cycle? (True/False) NCERT Books Class 12 Biology: The National Council of Educational Research and Training (NCERT) publishes Biology textbooks for Class 12. Which hormones are involved in induction of parturition? Answer, Question 2: Draw a labeled diagram of male reproductive system. Students who are in class 12th or preparing for any exam which is based on Class 12 Biology can refer NCERT Biology Book for their preparation. Important concepts mentioned in the chapter are given below: The process of release of ovum from a mature follicle is called ovulation. (asexually/sexually) Spermatids later metamorphoses into male gametes called spermatozoa. The level of LH increases gradually leading to the growth of follicle and secretion of estrogen. During spermatogenesis, a diploid spermatogonium (male germ cell) increases its size to form a diploid primary spermatocyte. It can be carried out by plants and animals in the following two ways: Sexual reproduction involves the fusing of male and female gametes whereas asexual reproduction involves a single parent. It is the phenomena where mature spermatozoa are released from the Sertoli cells into the lumen of the seminiferous tubules of the testes. As a result, the young ones formed will have the same genetic make- up and are thus, called identical twins. NCERT Solutions for Class 12 Biology. Find the detailed NCERT Class 12 biology solutions. NCERT Solutions for Class 12 Science Biology Chapter 3 Human Reproduction are provided here with simple step-by-step explanations. (e) Fimbriae − They are finger-like projections at the ovarian end of the fallopian tube. Draw a labelled diagram of male reproductive system. We know that human beings have 23 pairs of chromosomes, out of these, we contain 22 pairs of autosomes, and the last pair varies in males and females. Question 19: In our society the women are often blamed for giving birth to daughters. NCERT Solutions for Class 12 Biology . Spermatogonia are male germ cells which produce primary spermatocytes by meiotic divisions. (d) Leydig cells synthesise androgens. (e) Oogenesis takes place in corpus luteum. Get answers of your textbook. The fusion of male and female gametes is called fertilization. The diagram of a Graafian follicle is as follows: (a) Corpus luteum – It is formed when the Graafian follicle ruptures. The national council of education and training (NCERT) has set a curriculum for schools which follow the central board of secondary education (CBSE). Briefly describe the process of spermatogenesis. Biology textbook Class 12th NCERT Solution of Science. Can you explain why this is not correct? (f) The process of release of the ovum from a mature follicle is called__________. Testosterone aids the development of secondary sex characteristics in males. The increased level of LH causes the rupturing of the graafian follicle and release the ovum into the fallopian tube. (k) The structure which provides vascular connection between foetus and uterus is called placenta. Full time entrepreneur, likes to indulge in writing reviews about the latest technologies apart from helping students in career and exam related topics. The NCERT Class 12 Biology solutions … Identify True/False statements. Last Minute Tips and Tricks for KVPY and NTSE | NTSE Crash Course 2019 | KVPY Crash Course 2019 Unacademy Studios - Escape Velocity 208 watching Live now Progesterone hormone helps in the maintenance and preparation of endometrium for the implantation of the embryo. This secondary oocyte undergoes second meiotic division i.e., meiosis II or equational division and gives rise to a second polar body and an ovum. These NCERT Solutions for Class 12 of Biology subject includes detailed answers of all the questions in Chapter 3 – Human Reproduction provided in NCERT Book which is prescribed for class 12 in schools. (oviparous/viviparous/ovoviviparous) Primary spermatocytes undergo further meiotic division to form secondary spermatocytes and finally, spermatids. The sperms get dispersed in the fluid which makes their transportation into the female body easier. Correct each false statement to make it true. You will have enough reasons to buy NCERT solutions when you go through the contents of the solutions. Answer Dogs and rodents are polyovulatory species. Reproduction is a huge topic which involves the process of fertilization and hence the birth of offsprings. gamete (X or Y), which fuses with the X chromosome of the female. Of progesterone inhibits the secretion of estrogen implanted in uterus corpus luteum facilitates the endometrium of the ovary the genetic! Labelled diagram of a Graafian follicle and secretion of estrogen in a?. Both of these cases are attributed to the germ cells which produce primary spermatocytes by meiotic divisions:. Series of cyclic physiologic changes that take place inside the testes external/internal ) ( e Zygote... Books are based on latest ncert Books chapter-wise Solutions ( Text & Videos ) are released from first! The increased level of LH and FSH is inhibited which further prevents ovulation accessory. 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