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BSEB Class 12 Biology Human Reproduction Textbook Solutions PDF: Download Bihar Board STD 12th Biology Human Reproduction Book Answers

BSEB Class 12 Biology Human Reproduction Textbook Solutions PDF: Download Bihar Board STD 12th Biology Human Reproduction Book Answers
BSEB Class 12 Biology Human Reproduction Textbook Solutions PDF: Download Bihar Board STD 12th Biology Human Reproduction Book Answers


BSEB Class 12th Biology Human Reproduction Textbooks Solutions and answers for students are now available in pdf format. Bihar Board Class 12th Biology Human Reproduction Book answers and solutions are one of the most important study materials for any student. The Bihar Board Class 12th Biology Human Reproduction books are published by the Bihar Board Publishers. These Bihar Board Class 12th Biology Human Reproduction textbooks are prepared by a group of expert faculty members. Students can download these BSEB STD 12th Biology Human Reproduction book solutions pdf online from this page.

Bihar Board Class 12th Biology Human Reproduction Textbooks Solutions PDF

Bihar Board STD 12th Biology Human Reproduction Books Solutions with Answers are prepared and published by the Bihar Board Publishers. It is an autonomous organization to advise and assist qualitative improvements in school education. If you are in search of BSEB Class 12th Biology Human Reproduction Books Answers Solutions, then you are in the right place. Here is a complete hub of Bihar Board Class 12th Biology Human Reproduction solutions that are available here for free PDF downloads to help students for their adequate preparation. You can find all the subjects of Bihar Board STD 12th Biology Human Reproduction Textbooks. These Bihar Board Class 12th Biology Human Reproduction Textbooks Solutions English PDF will be helpful for effective education, and a maximum number of questions in exams are chosen from Bihar Board.

Bihar Board Class 12th Biology Human Reproduction Books Solutions

Board BSEB
Materials Textbook Solutions/Guide
Format DOC/PDF
Class 12th
Subject Biology Human Reproduction
Chapters All
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BSEB Class 12th Biology Human Reproduction Textbooks Solutions with Answer PDF Download

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Bihar Board Class 12 Biology Human Reproduction Text Book Questions and Answers

Question 1.
Fill in the blanks :
(а) Humans produce ……………………………… (asexually /sexually)
Answer:
Sexually.

(b) Humans are ……………………………… (oviparous, viviparous,ovoviviparous)
Answer:
Viviparous.

(c) Fertilisation is ……………………………… in humans, (enternal /internal)
Answer:
Internal.

(d) Male and female gametes are ……………………………… (diploid / haploid)
Answer:
Haploid.

(e) Zygote is ……………………………… (diploid / haploid)
Answer:
Diploid.

(f) The process of release of ovum from a mature follicle is called ……………………………… .
Answer:
Ovulation.

(g) Ovulation is induced by a harmone called ……………………………… .
Answer:
Estrogens.

(h) The fusion of male and female gemetes is called ……………………………… .
Answer:
Fertilisation.

(i) Fertilisation takes place in ……………………………… .
Answer:
Ampullarv-isthmic junction.

(j) Zygote divides to form ……………………………… which is implanted in uterus.
Answer:
Blastomers.

(k) The structure which provides vascular connection between fetus and uterus is called ……………………………… .
Answer:
Placenta.

Question 2.
Draw a labelled diagram of male reproductive system.
Answer:

Question 3.
Draw a labelled diagram of female reproduce systems.
Answer:

Question 4.
Write two major functions each of testis and ovary.
Answer:
Major functions of testis :
(a) Produces sperms
(b) Provide nutrition to germ cells and secrete testicular hormones called androgens.

Major functions of ovary :
(a) Produce female gamete (ovum)
(b) Produce several steroid harmones (ovarian hormones).

Question 5.
Describe the structure of a seminiferous tubule.
Answer:
Sperms are produced in the seminiferous tubles. Each seminiferous tubule is lined on its inside by two types of cells called male germ cells (spermatogonia) and Sertoli cells. The male germ cells undergo meiotic divisions finally leading to sperm formation, while Sertoli cells provide nutrition to the germ cells. The regions outside the seminiferous tubules called interstitial spaces, contain small blood vessels and interstitial cells or Leydig cells. There cells synthesise and secrete testicular hormones called androgens.

Question 6.
What is spermatogenesis? Briefly describe the process of spermatogenesis.
Answer:
In testis, the immature male germ cells produce sperms by spermatogenesis that begins at puberty, it is a process of formation and differentiation of haploid sex cells in sexually producing animals from undifferentiated diploid germ cells.

The spermatogonia present on the inside wall of seminiferous tubules multiply by mitotic division and increase in numbers. Each spermatogonium is diploid and contains 46 chromosomes. Some of the spermatogonia called primary spermatocytes periodically undergo meiosis. A primary spermatocyte completes the first meiotic division leading to formation of two equal haploid cells called secondary spermatocytes, which have only 23 chromosomes each.

The secondary spermatocytes undergo the second meiotic division to produce four equal, haploid spermatids.
The spermatids are transformed into spermatozoa by the process called spermiogenesis. After spermiogenesis sperm heads become embedded in the Sertoli cells, and are finally released from the seminiferous tubules by the process called spermiation.

Question 7.
Name the harmones involved in regulation of spermato-genesis.
Answer:
The increased levels of GnRH acts at the anterior pituitary gland and stimulates secretion of two gonadotropins – lutenising hormone (LH) and follicle stimulating hormone (FSH). LH acts at the Leydig cells and stimulates synthesis and secretion of androgens. Androgens, in turn, stimulate the process of spermatogenesis.

Question 8.
Define spermiogenesis and spermiation.
Answer:
Spermiogenesis – It the process of transfer of spermatids into spermatozoa (sperms).
Spermiation – It is the process of release of sperms after being embedded in the Sertoli cells from the seminiferous tubules.

Question 9.
Draw a labelled diagram of sperm.
Answer:

Question 10.
What are the major components of seminal plasma?
Answer:
The main components of seminal plasma are fructose, calcium and certain enzymes.

Question 11.
What are the major functions of male accessory ducts and glands?
Answer:
The male accessory ducts store and transport the sperms from the testis to the outside through urethra.
The secretions of accessory glands constitue the seminal plasma which is rich in fructose, calcium and certain enzymes. The secretions of bulbourethral glands help in^he lubrication of the penis.

Question 12.
What is oogenesis? Give a brief account of oogenesis.
Answer:
The process of formation of a mature female gamete is called oogenesis. Oogenesis takes place in the ovaries. Initial step is egg production occur prior to birth. Oogenio is formed by mitosis. These diploid cell develop into primary oocyte, begin the first step of the meiotic division. Oocyte starts developing, usually one at a time and once a month primary oocyte, grows much larger and completes the meiosis-1, forming a large secondary oocyte and a small polar body.

The first polar body does not undergo meiosis-11, whereas the secondary oocyte proceeds as far as the metaphase stage of meiosis-11. However, it awaits the arrival of the spermatozoa for completion of second meiotic division. Entry of the sperm restarts the cell cycle breaking down MPF (M-phase promoting factor) and turning on the APCC Anaphase promoting complex). Completion of meiosis-11 concerts the secondary oocyte into a fertilized egg or zygote (and also a second polar body).

Oogenesis occurs under the influence of endocrine hormones. The ova this produced within their ovarian follicles. The mature follicle ruptures to liberate the ovum.

Question 13.
Draw a labelled diagram of a section through ovary.
Answer:

Question 14.
Draw a labelled diagram of a Graafian follicle.
Answer:

Question 15.
Name the functions of the following :
(a) Corpus luteum
(b) Endometrium
(c) Acrosome
(d) Sperm tail
(e) Fimbriae
Answer:
(a) Corpus lateum – It secretes large amounts of progesterone which is essential for maintenance of the endometrium.
(b) Endometrium – It helps in the implantation of the fertilised ovum and other events of pregnancy.
(c) Acrosome – A cap-like structure found in sperm that help fertilization of the ovum.
(d) Sperm tail – It facilitates sperm mortality essential for fertilisation.
(e) Fimbriae – It helps in the collection of ovum after ovulation.

Question 16.
Identify True / False statements :
(a) Androgens are produced by Sertoli cells. (True / False)
Answer:
False.
(b) Spermatozoa get nutrition from Sertoli cells. (True / False)
Answer:
True.
(c) Leydig cells are found in ovary. (True / False)
Answer:
False.
(d) Leydig’cells synthesise androgens. (True / False)
Answer:
True.
(e) Oogenesis takes place in corpus luteum. (True / False)
Answer:
False.
(f) Menstrual cycle ceases during pregnancy. (True / False)
Answer:
True.
(g) Presence or absence of hymen is not a reliable indicator of virginity or sexual experience. (True / False)
Answer:
True.

Question 17.
What is menstrual cycle? Which hormones regulate menstrual cycle?
Answer:
In human beings, menstruation is repeated at an average internal of about 28/29 days and the cycle of events starting from one menstruation till the next one is called menstrual cycle.
Estrogen play a central role in the menstrual cycles. A rising level of FSH stimulates the growth of ovarian follicles and forritation of estrogens.

Question 18.
What is parturition? Which hormones are involved in induction of parturition?
Answer:
The process of delivery of the fetus (child birth) is called parturition. Oxytocin acts on the uterine muscle and causes stronger uterine contractions. The stimulatory reflex between the uterine contraction and oxytocin secretion continues resulting in stronger and stronger contractions. This leads to empulsion of the body put of the utreus through the birth canal.

Question 19.
In our society the women are often blamed for giving birth to daughters. Can you explain why this is not correct?
Answer:
The chromosome pattern in the human female is XX and that in the female is XY. Thus, all the haploid garnets produced by the female have the sex chromosome X whereas that is the male gametes could be either X or Y chromosome, hence 50 percent carry the X chromosome while the other 50 per cent carry the Y, after fusion of the gametes the zygote would carry either XX or XY depending on whether the sperm carrying X or Y fertilised the ovum. The zygote carrying XX would be a female baby and XY could be a male. Thus, from the above reason it is not correct to say the women are responsible for giving birth to a girl child.

Question 20.
How many eggs are released by a human ovary in a month? How many eggs do you think would have been released if the mother gave birth to identical twins? Would your answer change if the twins born were fraternal?
Answer:

  1. One ovum is released during the middle of each menstrual cycle
  2. Two eggs
  3. No.

Question 21.
How many eggs do you think were released by the ovary of a female dog which gave birth to 6 puppies?
Answer:
Six.

Bihar Board Class 12 Biology Human Reproduction Additional Important Questions and Answers

Very Short Answer Type Questions

Question 1.
Development of unfertilized ovum into a new individual is called :
Answer:
Parthenogenesis.

Question 2.
The mature follicles are termed as :
Answer:
Graafian follicle.

Question 3.
Degenerated carpus luteum is called :
Answer:
Follicular atresia.

Question 4.
What is semen?
Answer:
The products of the testes (spermatozoa) and prostate gland along with the fluid from the seminal vesicle are collectively known as semen.

Question 5.
Name accessory genital glands in male.
Answer:
Seminal vesicles, the prostrate and the bulbourethral glands are the accessory genital glands.

Question 6.
Name some extraembryonic membranes
Answer:
The extraembryonic or foetal membranes are the amnion charion allantois and yolk sac.

Question 7.
What is teratogen?
Answer:
Teratogen are the agents which may cause malformations in the developing embryo. These are chemicals.

Question 8.
What is functions of fallopian tubes?
Answer:
These conduct the ovum towards the uterus and ovum may be fertilized by a sperm in it.

Question 9.
What is colostrum?
Answer:
The colostrum is the first milk, which comes out from the mother’s mammary glands just after childbirth.

Question 10.
What is placenta?
Answer:
The placenta is temporary association between the foetal and maternal tissues. It consists of foetal part, deciduas basalis.

Question 11.
What is a zygote?
Answer:
The single-cell produced as a result of nuclear fusion of male and female gamete.

Question 12.
What is gestation period?
Answer:
It is the period between fertilization of ova and birth of young individual.

Question 13.
What is endometrium?
Answer:
The innermost lining of uterus containing glands and blood vessels.

Question 14.
What is corpus luteum?
Answer:
It is the ruptured Graafian follicle of ovary having large, yellow and conical cells.

Question 15.
What is hermaphrodite?
Answer:
The organism that has testes and ovaries both is called hermaphrodite.

Question 16.
What is parthenogenesis?
Answer:
It is the development of new individual directly from unfertilized egg.

Question 17.
Name the organism which is produced exclusively of parthenogenesis.
Answer:
Drone (male) honey bee.

Question 18.
Name the animal in which the process of budding is found.
Answer:
Hydra.

Question 19.
Where are the sperms stored in male?
Answer:
Epididymis.

Question 20.
Why is ovum non-motile?
Answer:
It is non-motile because of being fully laden with food material.

Short Answer Type Questions

Question 1.
What are the fundamental methods of reproduction?
Answer:
There are two fundamental methods of reproduction :

  1. Asexual – A single parent is involved. In this case a single-celled parent individual either splits or buds or fragments into two identical daughter cells of individuals, for example amoeba, paramoecium etc.
  2. Sexual – The two parents, each capable of producing gametes, spermatozoa and ova, are required. Many acellular protists, like monocytes plasmodium and all metazoans, employ sexual reproduction.

Question 2.
Where do you find corpora cavernosa?
Answer:
Corpora cavernosal is found under the skin of penis. It is a column of eractile tissue.
Under the skin, the penis contains three columns of eractile tissue: Two cylinders of the corpara cavernosa of the penis, placed dorsally, one cylinder – the corpus cavernosum of the urethra or corpus spongiosum, along the ventral side.

Question 3.
How is corpus luteum formed? What is its function?
Answer:
After ovulation, the granulosa cells and the interstitial cells form a mass of large and yellowish conical cells. This is named as corpus luteum.
Functions : It serves as temporary endocrine gland by releasing progesterone and estrogen.

Question 4.
What is follicular atresia?
Answer:
Most of the follicular in die two ovaries undergo regression and disappear due to death and disposal by phagocytes. This is referred to as follicular atresia.

Question 5.
Name the accessory structures of female reproductive system.
Answer:
Vulva or external genitalia are the female accessory genital glands. Vulva has small depression in front of the anus called vestibule.

Vestibule contains following structures :

  • Labia Majora: These are two outer skinny, moist hair covered folds forming the outer boundaries of the vulva. Anteriorly the two folds are joined to form monus pubis. A fleshy elevation above the labia is called mons veneris.
  • Labia Minora: These are two thin, small, moist folds of connective tissue covered with skin. On stretching over the clitoris to form the prepuce and beneath in form frenulum. The smooth, almond-shaped area into which opens the vagina and urethra between the labia minora is called the vestibule.
  • Clitoris: It is capable of enlargement but serves no reproductive function.
  • Bartholin’s Glands: These secrete clear viscous mucus containing alkaline fluid to lubricate the vulva and vagina during copulation.
  • Perineum: It lies between the anus and vaginal artifice.

Question 6.
How do leyding cell help in spermatogenesis?
Answer:
Interstitial cells or leydingcells that lie between the seminiferous tubules secrete testosterone. Testosterone is essential for making. sperm interstitial cell or Leydig cell-stimulating hormone (ICSH).

Question 7.
What is spermatogenesis? Write down its steps.
Answer:
It is process of formation and differentiation of haploid sex cells or garmetes in sexually reproducing animals form undifferentiated diploid germ cells.

Spermatogenesis is completed in three major steps :
(a) Spermatocutogenesis: During this process spermatogonia divide and produce successive generations of cells, which give rise to spermatocytes.
(b) Meiosis: During which the spermatocytes go through one reduction division (meiosis-I) and one equational division (meiosis-II).
(c) Spermiogenesis: During which the spermatids differentiate into spermatozoa.

Question 8.
What is capacitation?
Answer:
Sperm motivity occurs due to activation of the sperm by the viscous liquid secreted from the secretary cells of the epithelial lining of oviductal mucosa. The phenomenon of sperm activation in mammals is known as capacitation.

Question 9.
What is cortical reaction?
Answer:
Cortical reaction are the reaction by which egg-sperm binding takes place.
First: The egg becomes activated and undergoes depolarization of its membrane.
Second: The egg exhibits cortical reaction and shows zona reaction, which makes the egg impervious to any second sperm.

Question 10.
Name some chemicals that are released by acrosome during fertilization.
Answer:
The activated spermatozoa undergo acrosomal reaction and release various chemicals, like hyaluronidase that acts on the ground substances of follicle cells, corona penetrating enzyme that dissolves corona radiata and zona lysine or acrosin helps to digest the zona pellucida. All these chemicals are collectively termed sperm lysin. Fertilin proteins are present on the sperm surface.

Question 11.
How is polyspermy prevented?
Answer:
During the process of egg sperm binding, the egg becomes activated and undergoes depolarization of its membrane. The egg exhibits cortical reaction and shows zona reaction, which makes the egg impervious to any second sperm. This is how polyspermy, the entry of more than one sperm into the ovum is prevented.

Question 12.
How is milk production hormonally regulated?
Answer:
Colastrum is rich in colories and protein. Its synthesis is stimulated by the pituitary hormone prolactin (PRL). Its release is stimulated by a rise in the level of oxytocin when baby begins nursing. Milk contains an inhibitory peptide. If the breasts are not fully emptied, the peptide accumulates and inhibits milk production. This autocrine action, thus, matches supply with demand.

Question 13.
Mention three advantages of sexual reproduction.
Answer:
Sexual reproduction is the process of union of male and female gametes mostly morphologically and physiologically distinct the process is advantageous in the aspect that :

  1. The haploid gametes unite and the chromosome number of the species is restored.
  2. Variations are produced in the off-springs.
  3. Off-springs are better adapted to environmental conditions.

Question 14.
Give an account of accessory or secondary glands in a mammalian male reproductive system.
Answer:
Secondary glands include a prostate two seminal vesicles and two Cowper’s gland.
The prostate is located around the first part of the urethra and secretes its fluid into the urethra walls. These secretion enters the vas deferens through their ducts. Cowper’s gland are situated below the bladder are behind the urethra. Their secretion enters the urethra through their ducts.

Question 15.
What is semen? How is the secretion of accessory male sex glands significant?
Answer:
Semen is the fluid mixture of spermatozoa and the secretions of the accessory male sex glands in the urethra.
The secretion of accessory glands :

  • Provide fluid medium for transporting spermatozoa.
  • Supply nutrients to spermatozoa.
  • Maintain the viability and motility by providing proper pH and ionic strength.

Question 16.
Name the hormones that control the growth, maintenance and functions of duct system, accessory glands, penis, seminiferous tubules and Leydig cells.
Answer:

  • Testosterone promotes the growth, maintenance and functions of duct system, accessory gland and penis.
  • FSH regulates the growth maintenance and functions of seminiferous tubules.
  • LH (Luteinizing Hormone) regulates the growth, maintenance and functions of Leydig cells.

Question 17.
Mention the functions of (i) Fallopian tubes (ii) Uterus and (iii) Vagina.
Answer:
Fallopian Tubes: These conducts the ovum towards the uterus and ovum may be fertilized by a sperm in it
Uterus: The fertilized ovum at the blastocyst stage gets implanted on the wall of the uterus and develops into the growing foetus during pregnancy.
Vagina: It receives the semen from the male during mating. During childbirth, it conveys child to the outside.

Question 18.
Write down the major components of testis.
Answer:
in adult males, each testis is a small, structure. Each testis is a compound tubular gland and remains packed with numerous highly coiled tubules. The testes remain suspended in a skinny sac-like pouch called scrotum or scrotal sacs. Scrotum acts as thermoregulator keeps the testicular temperature 20C lower than the body. The scrotum is divided internally into right and left scrotal sacs by a muscular partition, the septum scroti. A scar-like raphe marks the lining of septum.

Inguinal passage or inguinal canals in the passage through which the testes descend down into scrotal sac. Each testis is held in position in scrotum by a small, thick fibrous cord, the gubernaculum and spermatic cord.
Each testis is surrounded by 3 distinct coat’s, i.e. tunica vaginalis, tunica albuginea and the tunica vasculosa. Each seminiferous tubules is lined by a single layer of germinal epithelium, which give rise to spermatozoa. These are released into the lumen of the tubule.

Question 19.
What is conjugation?
Answer:
This is a mode of sexual reproduction. Some acellular protist animals exhibit sexual reproduction by forming male and female gamete nuclei, which they exchange through temporary cytoplasmic bridge, later the cytoplasmic bridge disappears and the gamete nucleus of one individual fuse with that of the other to firm zygoto nuclei.

Question 20.
What is menstrual cycle? Write down the hormonal control over the menstrual cycle.
Answer:
Menstrual cycle starts between 12 to 15 years and continues until about 40-50 years. On a average, menstrual cycle continues for 28 days, after which some blood and other products of the disintegration of the uterine mucosa (the endometrium) are sloughed off and discharged form the uterus as menstrual bleeding. The process is called menstruation. During this period, the female reproductive system shows regular cycle changes. The cycle is known as menstrual cycle.

Hormonal Control: Estrogen plays a control role in the menstrual cycles. As the menstruation ceases, ovarian follicle secreteis estrogens. It causes the formation of thick endometrium and more richly supplied with blood vessels and endometrium glands. A rising level of FSH stimulates the growth of ovarian follicles and
formation of estrogens. The most immediate effect of FSH is the maturation of existing of late primary or secondary follicle.

Long Answer Type Questions

Question 1.
Distinguish between spermatogenesis and oogenesis.
Answer:

Spermatogenesis Oogenesis
(i) It takes place ¡h the seminiferous tubules of the testes by repeated division of spermatogonia in maIes. (i) It takes place in the Graafian follicles of the ovary by the repeated division of Oogonia in the females.
(ii) It occurs in four stages spermatogenesis, meiosis-l,meiosis-II and spermatogenesis. (ii) It occurs in three stages, Oocytogenesis, Meiosis-l and Meiosis-II.
(iii) Spermatogenesis involves the maturation of spermatids into sperms. (iii)There is no such change.
(iv) Primary spermatocyte gives rise to four spermatozoa. (iv) Primary Oocyte gives rise to one ovum only and three polar bodies.
(v) Spermatozoa thus formed are motile and without food reserve. (v) Ovum thus formed are non-motile and generally full of food reserves.

Question 2.
Explain female mammary glands with the help of diagram.
Answer:
The mammary glands in female animals are paired structures that contain glandular tissue and variable amount of fat. The glandular tissue of each breast (mammary gland) is divided into 1 5-20 mammary lobes containing clusters of cells called alveoli (Fig.).

The cells of alveoli secrete milk, which is stored in the cavities (lumens) of alveoli. The alveoli open into mammary tubules. The tubules of each lobe join to form a mammary duct. Several mammary ducts join to form a wider mammary ampulla which is connected to lactiferous duct through which milk is sucked out.

Question 3.
With the help of a diagram explain the structure of a sperm.
Answer:
The sperm is composed of a head, neck, a middle piece and a tail (Fig.). A plasma membrane envelops the whole body of sperm. The head of the sperm contain an alongated haploid nucleus, the anterior portion of which is covered by a cap Ike structure, acrosome. The acrosome is filled with enzymes that help fertilization of the ovum. The middle piece possesses numerous mitochondria, which produce energy for the movement of tiI that facilitate sperm morality essential for fertilization. Plasma membrane energy for the movement of til that facilitate sperm morality essential for fertilization.


BSEB Textbook Solutions PDF for Class 12th


Bihar Board Class 12th Biology Human Reproduction Textbooks for Exam Preparations

Bihar Board Class 12th Biology Human Reproduction Textbook Solutions can be of great help in your Bihar Board Class 12th Biology Human Reproduction exam preparation. The BSEB STD 12th Biology Human Reproduction Textbooks study material, used with the English medium textbooks, can help you complete the entire Class 12th Biology Human Reproduction Books State Board syllabus with maximum efficiency.

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