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NCERT Exemplar Class 12 Biology Solutions Chapter 3 Human Reproduction
Edited By Priyanka kumari | Updated on Aug 25, 2022 06:10 PM IST | #CBSE Class 12th
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NCERT exemplar Class 12 Biology solutions chapter 3 Human Reproduction is a very important chapter from the examination point of view. The experts in this field who have deep knowledge and understanding about the field have prepared NCERT exemplar Class 12 Biology chapter 3 solutions to provide accurate information. The experts have used simple and understandable language to prepare Class 12 Biology NCERT exemplar solutions in chapter 3. The solutions will help the students to refer to this quality study material to experience the best learning. NCERT exemplar Class 12 Biology solutions chapter 3 pdf download is useful to access it offline.
This Story also Contains
- Long Answer Type Questions:
- Short Answer Type Questions:
- Very Short Answer Type Questions:
- Multiple Choice Questions:
- Major Subtopics in NCERT Exemplar Class 12 Biology Solutions Chapter 3 Human Reproduction:
- NCERT Exemplar Class 12 Biology Solutions Chapter 3 Human Reproduction - Learning Outcome:
- NCERT Exemplar Class 12 Biology Chapter Wise Links:
- Benefits of NCERT Exemplar Class 12 Biology Solutions Chapter 3 Human Reproduction:
- NCERT Exemplar Class 12 Solutions Subject Wise:
In this chapter of NCERT Class 12 Solutions, the students will learn and study the different reproductive events in humans, which include the formation of sperms in males, ovulation in females, insemination, fertilization, implantation, gestation, and the delivery of the baby.
Long Answer Type Questions:
Question:1
Answer:
Pituitary gonadotropins (FSH and LH) play a very vital role during the follicular and ovulatory phases of the menstrual cycle.
- FSH stimulates the release of ovum from the Graafian follicle. It also stimulates the development and subsequent rupture of Graafian follicle. Thus, FSH plays a major role during the follicular and ovulatory phases.
- The above figure shows varying levels of LH. FSH and steroid hormones during follicular and ovulation phases of the menstrual cycle.
- At this stage, the level of estradiol (a steroid hormone) increases. This suppresses the level of Luteinizing hormone (LH). Once the level of estradiol reaches a threshold level, the effect is reversed.
- After that, the level of estrogen (another steroid hormone) increases. This stimulates a surge in levels of LH. High level of L.H stimulates the development of corpus luteum and proliferation of the endometrium, thus, marking the beginning of the luteal phases.
Question:2
Meiotic division during oogenesis is different from that in spermatogenesis. Explain how and why?
Answer:
It is true that the meiotic division during oogenesis is different from that in spermatogenesis. Following are the details about significant differences between them:
- In the case of spermatogenesis, meiotic division begins at the time of puberty. This is the time when spermatogenesis begins in a male. On the other hand, oogenesis begins in the female when the female is still in the womb. Thus, it can be said that meiotic division during oogenesis begins when the girl child is still in the womb.
- Formation of primary oocytes stops by the 20th week of gestation of the female child. On the contrary, the production of spermatocytes continues throughout the reproductive phase of a male.
- All the stages of meiosis take place quickly after one another in case of spermatogenesis and there is no time lag between them. In case of oogenesis, meiosis is deferred at the Prophase I state.
Meiosis resumes only once the puberty begins.
Following are some possible reasons for this difference in patterns of oogenesis and spermatogenesis:
- Male gametes need to be formed in very large number to ensure Fertilisation.
- Female gametes are not exposed to external hazards, and hence a less number of them would be enough. Limiting the production of female gametes helps in conservation of resources from the female body. The resources can then be properly utilised during the development of the foetus.
Question:3
Answer:
The following figure shows various stages of zygote development till implantation:
(a) The zygote divides into two-cell stage called cleavage. This development takes place when the zygote is still in the isthmus.
(b) The cleavage undergoes further rounds of mitosis to form 2, 4, 8 and finally 16-celled stage.
These daughter cells are called blastomere.
(c) The 16-celled stage is known as morula.
(d) The morula changes into blastocyst; with more rounds of meiosis. At this stage, the blastomeres are arranged in an outer layer of cells; called trophoblast and an inner mass of cells.
(e) Implantation to uterine wall happens at the blastocyst stage.
Question:4
Draw a neat diagram of the female reproductive system and label the parts associated with the following
(a) production of gamete,
(b) site of fertilisation
(c) site of implantation and,
(d) birth canal.
Answer:
Question:5
With a suitable diagram, describe the organisation of mammary gland.
Answer:
Mammary glands are paired structures which contain glandular tissue and a variable amount of fat.
- Glandular tissue present in each breast is made up of 15 - 20 mammary lobes. These lobes have clusters of cells known as alveoli.
- Milk, stored in the cavities (lumens) of alveoli, is secreted from the cells of alveoli. The alveoli open in mammary tubules.
- Tubules from each lobe join to form a mammary duct.
- Many mammary ducts join to form a wider mammary ampulla.
- A mammary ampulla is connected to the lactiferous duct. Milk is sucked out through the lactiferous duct.
Short Answer Type Questions:
Question:1
Answer:
Menarche marks the onset of puberty (beginning of reproductive phase).
Menopause marks the end of the reproductive phase.
Question:2
a. How many spermatozoa are formed from one secondary spermatocyte?
b. Where does the first cleavage division of zygote take place?
Answer:
(a) One secondary spermatocyte forms four spermatids, all of which subsequently develop into spermatozoa via the process spermiogenesis.
(b) The first cleavage division of zygote takes place in the ampullary-isthmus junction.
Question:4
Answer:
Corpus luteum is responsible for the secretion of progesterone, which is essential to maintain the endometrium and helps in the proper development of the foetus.
This is the reason for the long life of Corpus luteum when Fertilisation has occurred. However, when there is no fertilisation, it serves no purpose and thus remains active only for 10-12 days
Question:4
What is foetal ejection reflex? Explain how it leads to parturition?
Answer:
Foetal ejection reflex is the mild uterine contraction at the time of childbirth. It triggers the release of oxytocin from the maternal pituitary, which induces strong uterine contraction and finally leads to parturition.
Question:5
Except for the endocrine function, what are the other functions of the placenta?
Answer:
The placenta is responsible for the following in addition to its endocrine function –
(A) Supply of oxygen and nutrient to foetus
(B) Removal of waste products from the foetus
Question:6
Why do doctors recommend breastfeeding during the initial period of infant growth?
Answer:
Milk produced during the initial few days of lactation is known as colostrum and contains several antibodies, which are important for the development of disease resistance in the baby. This is the prime reason why doctors recommend breastfeeding during the initial period of growth of an infant.
Question:7
Answer:
During the follicular phase of the menstrual cycle, the following things happen in the ovary and the uterus –
- The primary follicle in the ovary grows into fully mature Graafian follicle
- Endometrium in the uterus regenerates through the proliferation
- Estrogen is secreted by growing follicle
Question:8
Answer:
Hormones responsible for various changes during the menstrual cycle are:
- Follicle Stimulating Hormone (FSH): It is responsible for the transformation of the primary follicle into Graafian follicle.
- Follicle Stimulating Hormone (FSH): It is also responsible for ovulation. It works in coordination with LH and complement its function.
- Luteinizing Hormone (LH): It is responsible for the development of corpus luteum from Graafian follicle.
Question:10
Answer:
Following changes occur in the oogonia during the transition of a primary follicle to Graafian follicle:
(a) Each primary oocyte is surrounded by a layer of granulosa cells; called a primary follicle
(b) Primary follicle transforms into secondary follicle by getting surrounded by another layer of granulosa cells and a new theca.
(c) The secondary follicle then transforms into the tertiary follicle. The tertiary follicle is characterised by a fluid-filled cavity called the antrum. At this stage, the primary oocyte undergoes second meiotic division and forms secondary oocyte and a tiny polar body.
(d) The tertiary follicle then changes into mature Graafian follicle. During this stage, a new layer; called zona pellucida; develops around the secondary oocyte.
Very Short Answer Type Questions:
Question:1
Answer:
Gametogenesis→Insemination→Fertilization→Implantation→Gestation→Parturition
Question:3
What is the role of cervix in the human female reproductive system
Answer:
Cervix and vagina together form the birth canal. Parturition happens through the birth canal.
Question:4
Why are menstrual cycles absent during pregnancy?
Answer:
Gonadotropins, which are required for the development of new follicles, are suppressed due to the high levels of progesterone and estrogen during pregnancy. This inhibits the initiation of a new menstrual cycle.
Question:5
Column A | Column B |
Ovaries Oviduct B Vagina | Ovulation A Pregnancy Birth |
Answer:
A. Fertilisation
B. Uterus
Question:6
Answer:
Parturition signals arise from the foetus. Oxytocin is the main hormone involved in parturition and is released from the maternal pituitary gland.
Question:7
What is the significance of epididymis in male fertility?
Answer:
Secretions from the epididymis, vas deferens, prostate and seminal vesicle are essential for maturation and motility of sperms. These organs play an important role in male fertility.
Question:8
Answer:
Hormone | Function | Hormone’s origin |
Gonadotropin Releasing Hormone (GnRH) | Act on the anterior pituitary gland and stimulates the release of LH and FSH | Hypothalamus |
Luteinizing Hormone (LH) | Acts at Leydig cells and stimulates the secretion of androgen | Pituitary |
Follicle Stimulating Hormone (FSH) | Acts on Sertoli cells and stimulates factors which are involved in spermatogenesis | Pituitary |
Question:10
Answer:
Chromosome number reduces to half in gametes as, during gametogenesis, meiosis takes place resulting in the haploid number of chromosomes.
During Fertilisation, male and female gametes undergo fusion to make the diploid zygote.
Question:11
What is the difference between a primary oocyte and a secondary oocyte?
Answer:
Primary Oocyte | Secondary Oocyte |
Primary oocyte is formed when the female is still in the womb | Secondary oocyte is formed when the individual undergoes puberty |
It is surrounded by secondary follicle | It is surrounded by tertiary follicle |
Number of chromosomes is 46 | Number of chromosomes is 23 |
Question:12
What is the significance of ampullary-isthmic junction in the female reproductive tract?
Answer:
First cleavage division of zygote occurs in the ampullary-isthmic junction in the female reproductive tract
Question:13
How does zona pellucida of ovum help in preventing polyspermy?
Answer:
Zona pellucida’s membrane undergoes changes when sperm comes into contact with it. This prevents the entry of other sperm into the ovum and thus prevent polyspermy.
Question:14
Mention the importance of LH surge during the menstrual cycle.
Answer:
Rupture of Graafian follicle is induced by a rapid surge in LH level. Resulting in the release of ovum (ovulation)
Question:15
Which type of cell division forms spermatids from the secondary spermatocytes?
Answer:
Meiosis results in the formation of spermatids from secondary spermatocytes.
Multiple Choice Questions:
Question:1
Choose the incorrect statement from the following:
a. In birds and mammals, internal Fertilisation takes place
b. Colostrum contains antibodies and nutrients
c. Polyspermy in mammals is prevented by the chemical changes in the egg surface
d. In the human female implantation occurs almost seven days after Fertilisation
Answer:
The answer is the option (c) Polyspermy in mammals is prevented by the chemical changes in the egg surface
Explanation: Zona pellucida absorbs water and swells preventing further entry of sperms. So, physical change rather than chemical change is responsible for the prevention of polyspermy in mammals.
Question:2
Identify the correct statement from the following:
a. High levels of estrogen trigger the ovulatory surge.
b. Oogonial cells start to proliferate and give rise to functional ova in regular cycles from puberty onwards.
c. Sperms released from seminiferous tubules are highly motile.
d. Progesterone level is high during the post-ovulatory phase of the menstrual cycle
Answer:
The answer is the option (d) Progesterone level is high during the post-ovulatory phase of the menstrual cycle
Explanation: Ovulatory surge is triggered by the high levels of LH and FSH. Sperms released from seminiferous tubules are non-motile. Oogonial cells stop their activity when the girl child is still in the womb.
Question:3
Spot the odd one out from the following structures with reference to the male reproductive system:
a. Rete testis
b. Epididymis
c. Vasa efferentia
d. Isthmus
Answer:
The answer is the option (d) Isthmus
Explanation: Isthmus is a part of the oviduct in the female reproductive system. Others are parts of the male reproductive system
Question:4
Seminal plasma, the fluid part of semen, is contributed by.
i. Seminal vesicle
ii. Prostate gland
iii. Urethra
iv. Bulbourethral gland
(a) i and ii (b) i, ii and iv (c) ii, iii and iv (d) i and iv
Answer:
The answer is the option (b) (i), (ii) and (iv)
Explanation: Urethra has no contribution to seminal plasma
Question:5
Spermiation is the process of the release of sperms from:
a. Seminiferous tubules
b. Vas deferens
c. Epididymis
d. Prostate gland
Answer:
The answer is the option (a) Seminiferous tubules
Explanation: Seminiferous tubules
Question:6
Mature Graafian follicle is generally present in the ovary of a healthy human female around:
a. 5 – 8 day of menstrual cycle
b. 11 – 17 day of menstrual cycle
c. 18 – 23 day of menstrual cycle
d. 24 – 28 day of the menstrual cycle
Answer:
The answer is the option (b) 11-17 day of the menstrual cycle
Explanation: After rupturing in Graafian follicle, ovulation takes place in this period
Question:7
The acrosomal reaction of the sperm occurs due to:
a. Its contact with zona pellucida of the ova
b. Reactions within the uterine environment of the female
c. Reactions within the epididymal environment of the male
d. Androgens produced in the uterus
Answer:
The answer is the option (a) Its contact with zona pellucida of the ova
Explanation: Sperm can enter the ova only after the enzyme from acrosome breaks down the zona pellucida
Question:8
Which one of the following is not a male accessory gland?
a. Seminal vesicle
b. Ampulla
c. Prostate
d. Bulbourethral gland
Answer:
The answer is the option (b) Ampulla
Explanation: Ampulla is part of the fallopian tube
Question:9
The spermatogonia undergo division to produce sperms by the process of spermatogenesis. Choose the correct one with reference to above.
a. Spermatogonia have 46 chromosomes and always undergo meiotic cell division
b. Primary spermatocytes divide by mitotic cell division
c. Secondary spermatocytes have 23 chromosomes and undergo second meiotic division
d. Spermatozoa are transformed into spermatids
Answer:
The answer is the option (c) Secondary spermatocytes have 23 chromosomes and undergo second meiotic division
Explanation: Spermatogonia have 46 chromosomes, and they undergo meiotic cell division; primary spermatocytes undergo meiotic cell division. Spertamids and transformed into spermatozoa
Question:10
Column I A. Head B. Middle piece C. Acrosome D. Tail | Column II i. Enzymes ii. Sperm motility iii. Energy iv. Genetic material |
a. A-ii, B-iv, C-i, D-iii
b. A-iv, B-iii, C-i, D-ii
c. A-iv, B-i, C-ii, D-iii
d. A-ii, B-i, C-iii, D-iv
Answer:
The answer is the option (b) (A) – (iv), (B) – (iii), (C) – (i), (D) – (ii)
Explanation: Nucleus is present in the head. Acrosome releases enzyme which dissolves zona pellucida. The tail helps in swimming of sperm and the middle piece is the place where mitochondria are present
Question:12
Match the following and choose the correct options:
Column I A. Trophoblast B. Cleavage C. Inner cell mass D. Implantation | Column II i. Embedding of the blastocyst in the endome trium ii. Group of cells that would differentiate as embryo iii. The outer layer of blastocyst attached to the endometrium iv. Mitotic division of the zygote |
a. A-ii, B-i, C-iii, D-iv
b. A-iii, B-iv, C-ii, D-i
c. A-iii, B-i, C-ii, D-iv
d. A-ii, B-iv, C-iii, D-i
Answer:
The answer is the option (b) (A)-(iii), (B)-(iv), (C)-(ii), (D)-(i)
Question:13
Which of the following hormones is not secreted by human placenta?
a. hCG
b. Estrogens
c. Progesterone
d. LH
Answer:
The answer is the option (d) LH
Explanation: LH (Luteinizing hormone) is secreted by the pituitary gland
Question:14
The vas deferens receives duct from the seminal vesicle and opens into urethra as:
a. Epididymis
b. Ejaculatory duct
c. Efferent ductule
d. Ureter
Answer:
The answer is the option (b) Ejaculatory duct
Explanation: Ejaculatory duct
Question:15
Urethral meatus refers to the:
a. Urinogenital duct
b. Opening of vas deferens into urethra
c. The external opening of the urinogenital duct
d. Muscles surrounding the urinogenital duct
Answer:
The answer is the option (c) External opening of the urinogenital duct
Explanation: External opening of the urinogenital duct
Question:16
Morula is a developmental stage:
a. Between the zygote and blastocyst
b. Between the blastocyst and gastrula
c. After the implantation
d. Between implantation and parturition
Answer:
The answer is the option (a) between the zygote and blastocyst
Explanation: between the zygote and blastocyst
Question:17
The membranous cover of the ovum at ovulation is:
a. Corona Radiata
b. Zona radiata
c. Zona pellucida
d. Chorion
Answer:
The answer is the option (a) corona radiate
Explanation: corona radiate
Question:18
Identify the odd one from the following:
a. Labia minora
b. Fimbriae
c. Infundibulum
d. Isthmus
Answer:
The answer is the option (a) Labia Minora
NCERT exemplar Class 12 Biology solutions chapter 3 helps students to learn and understand the different reproductive events, thus they will get to know about the functioning of different parts in a human body.
Major Subtopics in NCERT Exemplar Class 12 Biology Solutions Chapter 3 Human Reproduction:
- 3.1 The Male Reproductive System
- 3.2 The Female Reproductive System
- 3.3 Gametogenesis
- 3.4 Menstrual Cycle
- 3.5 Fertilisation and Implantation
- 3.6 Pregnancy and Embryonic Development
- 3.7 Parturition and Lactation
NCERT Exemplar Class 12 Biology Solutions Chapter 3 Human Reproduction - Learning Outcome:
- In Class 12 Biology NCERT exemplar solutions chapter 3, the students will learn about the different events that take place in the human body with the functioning of reproductive parts.
- There are different topics that are covered in this chapter that the students should know when it comes to human reproduction. Every topic covered in NCERT exemplar Class 12 Biology chapter 3 solutions is very well explained in detail.
- The students will study the various reproductive events that occur after puberty in humans. There are many differences between the reproductive events occurring in males and females.
NEET Highest Scoring Chapters & Topics
Most Scoring concepts For NEET (Based On Previous Year Analysis)
Download EBookNCERT Exemplar Class 12 Biology Chapter Wise Links:
Benefits of NCERT Exemplar Class 12 Biology Solutions Chapter 3 Human Reproduction:
- The different parts and how they function in the human body is very important for the students to understand. The reproductive parts and their functioning is very well explained in the NCERT exemplar solutions for Class 12 Biology chapter 3.
- It also provides important information about the different stages and how it is developed.
- NCERT exemplar Class 12 Biology solutions chapter 3 is fun and interesting for all those students who wish to learn about the different parts and how it works. This chapter is helpful for the students who wish to make a career in biology.
NCERT Exemplar Class 12 Solutions Subject Wise:
Check NCERT solutions for questions given in the book:
Chapter 1 | |
Chapter 2 | |
Chapter 3 | |
Chapter 4 | |
Chapter 5 | |
Chapter 6 | |
Chapter 7 | |
Chapter 8 | |
Chapter 9 | |
Chapter 10 | |
Chapter 11 | |
Chapter 12 | |
Chapter 13 | |
Chapter 14 | |
Chapter 15 | |
Chapter 16 |
Also, Read NCERT Solution subject wise
- NCERT Solution for Class 12 Physics
- NCERT Solution for Class 12 Chemistry
- NCERT Solution for Class 12 Maths
- NCERT Solution for Class 12 Biology
Must Read NCERT Notes subject wise
- NCERT Notes for Class 12 Physics
- NCERT Notes for Class 12 Chemistry
- NCERT Notes for Class 12 Maths
- NCERT Notes for Class 12 Biology
Also Check NCERT Books and NCERT Syllabus here
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The experts use the chapters and also the information that is provided to them along with their practical knowledge.
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Hope it helps !
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Ashvadha 12 July,2024
Popular CBSE Class 12th Questions
A block of mass 0.50 kg is moving with a speed of 2.00 ms-1 on a smooth surface. It strikes another mass of 1.00 kg and then they move together as a single body. The energy loss during the collision is
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A particle is projected at 600 to the horizontal with a kinetic energy . The kinetic energy at the highest point
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In the reaction,
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How many moles of magnesium phosphate, will contain 0.25 mole of oxygen atoms?
| Option 1)
0.02 |
Option 2)
3.125 × 10-2 |
| Option 3)
1.25 × 10-2 |
Option 4)
2.5 × 10-2 |
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