Select Board & Class
list any four methods of contraception used by humans. how does their use have a direct effect on the health and prosperity of the family?
how mammary glands are integrated structurally and functionally to support the process of ovulation, fertilization, pregnancy, birth and child care?????
plz explain, these lines are written in NCERT textbook.
why menstrual blood doesn't clot?
Explain the process of oogenesis.
(please explain because i want the proper answer of this ques.)
Draw a neat labelled sketch of Graafian follicle.
Why does failure of testes to descend into the scrotum produce sterility?
how does menstrual flow occurs after tubectomy?... i mean the passage blocked then how does the degnerated egg comes out from...????
what is embryo proper?
What is spermatogenesis? Briefly describe the process of spermatogenesis.
List all the changes that occur in the ovum during fertilisation.
what is sporogenous tissue?
give a labeled diagram of spermatogenesis as im finding it difficult to understand .
Draw a labeled diagram of female reproductive system.
Female pronucleus is
(a)cytoplasm of ovum (b)nucleus of ovum (c)nucleus of quaternary oocyte (d)both b and c
why is menstrual cycle absent during pregnancy?
WHAT IS THE FUNCTION OF INFUNDIBULUM
the function of prostate gland is ......?
WHAT IS THE SIGNIFICANCE OF SPERMATOGENESIS & OOGENESIS?
what is spermatic cord? What is gubernaculum?
explain male reproductive system
what is major difference between spermatogenesis & oogenesis?
A female of 30 yrs age attained puberty at the age of 13 yrs. She has three children born by normal delivery. How many polar body are formed in her body till date. (Each M.C. is of 30 days) :
(1)160
(2)159
(3)162
(4)161
The correct answer is (3). Could you please explain ? Question from Human Reproduction Class XII
difference between ducts and glands????
what is foetal ejection reflex?
Secondary oocyte retains bulk of the nutrient rich cytoplasm of the primary oocyte. Can you think of any advantage for this? rn Does the first polar body born out of first meiotic division divide further or degenerate?rn
WHAT IS PREGNANCY HORMONE? WHY IT IS CALLED SO? NAME TWO SOURCES OF THIS HORMONE IN HUMAN FEMALE?
from where do signals of parturition originate and what does maternal pituitary release for stimulating uterine contractions for child birth?
distingiush b/w morula gastrula and blastula
Can anal sexual intercouse lead to fertilisation?If not, then why it is done?
DIFFERENCE BETWEEN SPERMIOGENESIS AND SPERMIATION
difference between zoospore and zygote ?
what is oogenesis?
Draw a labelled diagram of Blastocyst
Draw a sectional view of human blastocyst and label trophoblast and inner cell mass. Mention the fate of trophoblast after the implantation of the blastocyst.
List the changes the primary oocyte underqoes in the tertiary follicular stage in the human ovary.
What are the three major phases of menstrual cycle in primates?Mention the key event in each phase.
why is placenta called a temporary endocrine gland?
when and how does placenta develop in human female?
what is the main difference between insemination and ejaculation?
spermatogenesis in human male is a hormone regulated process. justify
which hormone is called as the pregnancy hormone? ...why ?
Draw a labeled diagram of sperm.
explain the steps in the formation of an ovum from an oogonium in humans
what is corona radiata?what is the difference between corona radiata and zona pellucida?
why does not all copulations lead to pregnancy???
which part of the blastula is destined to form the germ layers of the developing embro in humans
What is mean by Spermlysin ??????????
after tubectomy does menstrual cycle continue? there is a knot tied in the tube so how does the cycle takes place? pls give a proper answer
What is the difference between umbilical cord and placenta??
Draw a labeled diagram of a Graafian Follicle?
draw a flow chart to show the hormonal control of the human male reproductive system highlighting the inhibitory and stimulatory directions in it
if asked to draw a labbeled diagram of male reproductive system in exam , which one we hav to write ...
there r 2 diagrams in textbook ...
pls answer asap
URGENT!! Define seminal vessicles ,,,prostate gland and cowper's gland.????
dear experts
1.why is oogenesis considered as a discontinous and wasteful process?
2.is ejaculation and insemination the same ?
3.what is monospermy?
4.how implantation takes place ?
does menstruation occur even after tubectomy in females?? and does ovulation too occurs??
A. Corona radiata, zona pellucida, vitelline membrane
B. Zona pellucida, corona radiata, vitelline membrane
C. Vitelline membrane, zona pellucida, corona radiata
D. Zona pellucida, vitelline membrane, corona radiate pls explain with diagram as nothing is mentioned nywhere about vitelline membrane.
What is the difference between blastulation and gastrulation?
the seminiferous tubules of the testis are lined by the germinal epithelium consisting of.......?
After a successful in vitro fertilization the fertilized egg begins for begins to divide where is this egg transferred before it reaches the 8 cell stage What is the techniques?
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Syllabus
list any four methods of contraception used by humans. how does their use have a direct effect on the health and prosperity of the family?
how mammary glands are integrated structurally and functionally to support the process of ovulation, fertilization, pregnancy, birth and child care?????
plz explain, these lines are written in NCERT textbook.
why menstrual blood doesn't clot?
Explain the process of oogenesis.
(please explain because i want the proper answer of this ques.)
Draw a neat labelled sketch of Graafian follicle.
Why does failure of testes to descend into the scrotum produce sterility?
how does menstrual flow occurs after tubectomy?... i mean the passage blocked then how does the degnerated egg comes out from...????
what is embryo proper?
What is spermatogenesis? Briefly describe the process of spermatogenesis.
List all the changes that occur in the ovum during fertilisation.
what is sporogenous tissue?
1) graafian follicle
2)tertiary follicle
3)secondary follicle
4) primary follicle
give a labeled diagram of spermatogenesis as im finding it difficult to understand .
T.S of mammalian testis revealing seminiferous tubules show different types of cell
Draw a labeled diagram of female reproductive system.
a) Cells of Leydig
b) Sustentacular cells
c) Interstitial cells
d) Spermatogonial cells
Female pronucleus is
(a)cytoplasm of ovum (b)nucleus of ovum (c)nucleus of quaternary oocyte (d)both b and c
why is menstrual cycle absent during pregnancy?
WHAT IS THE FUNCTION OF INFUNDIBULUM
the function of prostate gland is ......?
Q15. Assume 2n = 12 in a hypothetical species. In gametogenesis, the number of chromosomes in a spermatid would be _____________ and in a first polar body would be __________
(a) 3,6 (b) 3 , 3
(c) 6 ,3 (d) 6 , 6
WHAT IS THE SIGNIFICANCE OF SPERMATOGENESIS & OOGENESIS?
what is spermatic cord? What is gubernaculum?
explain male reproductive system
what is major difference between spermatogenesis & oogenesis?
A female of 30 yrs age attained puberty at the age of 13 yrs. She has three children born by normal delivery. How many polar body are formed in her body till date. (Each M.C. is of 30 days) :
(1)160
(2)159
(3)162
(4)161
The correct answer is (3). Could you please explain ?
Question from Human Reproduction Class XII
difference between ducts and glands????
what is foetal ejection reflex?
reason: secretion of epididymis,vas defernes, seminal vessicle, and prostate gland are essential for maturation and motility of sperms.
give reason why
both assertion and reason are true but reason is not the correct explanation of the assertion . ?
Secondary oocyte retains bulk of the nutrient rich cytoplasm of the primary oocyte. Can you think of any advantage for this? rn
Does the first polar body born out of first meiotic division divide further or degenerate?rn(a) pivot joint
(b) hinge joint
(c) gliding joint
(d) ball and socket joint
WHAT IS PREGNANCY HORMONE? WHY IT IS CALLED SO? NAME TWO SOURCES OF THIS HORMONE IN HUMAN FEMALE?
from where do signals of parturition originate and what does maternal pituitary release for stimulating uterine contractions for child birth?
(1) Acrosomal reaction
(2) Depolarisation of plasma membrane
(3) Cortical reaction
(4) Zona reaction
Annd what is slow block to polyspermy?
distingiush b/w morula gastrula and blastula
Can anal sexual intercouse lead to fertilisation?If not, then why it is done?
cycle is directly responsible for degeneration of
corpus luteum?
(1) Estrogen (2) Progesterone
(3) LH (4) FSH
a) cleavage divisions bring about considerable increase in protoplasm size
b) in second cleavage division, one of the two blastomeresusually diviidea little sooner than the 2nd.
c) with more cleavages, the resultant blastomeres become larger and larger.
d) cleavage divisions result in a hollow ball of cells called morula
DIFFERENCE BETWEEN SPERMIOGENESIS AND SPERMIATION
difference between zoospore and zygote ?
what is oogenesis?
Draw a labelled diagram of Blastocyst
Draw a sectional view of human blastocyst and label trophoblast and inner cell mass. Mention the fate of trophoblast after the implantation of the blastocyst.
List the changes the primary oocyte underqoes in the tertiary follicular stage in the human ovary.
What are the three major phases of menstrual cycle in primates?Mention the key event in each phase.
why is placenta called a temporary endocrine gland?
when and how does placenta develop in human female?
what is the main difference between insemination and ejaculation?
spermatogenesis in human male is a hormone regulated process. justify
which hormone is called as the pregnancy hormone? ...why ?
Draw a labeled diagram of sperm.
explain the steps in the formation of an ovum from an oogonium in humans
what is corona radiata?what is the difference between corona radiata and zona pellucida?
Q). The controlling centre of autonomic nervous system is
(a) Hypothalamus
(b) Spinal cord
(c) Cerebellum
(d) Medulla oblongata
why does not all copulations lead to pregnancy???
which part of the blastula is destined to form the germ layers of the developing embro in humans
What is mean by Spermlysin ??????????
after tubectomy does menstrual cycle continue? there is a knot tied in the tube so how does the cycle takes place? pls give a proper answer
What is the difference between umbilical cord and placenta??
Draw a labeled diagram of a Graafian Follicle?
draw a flow chart to show the hormonal control of the human male reproductive system highlighting the inhibitory and stimulatory directions in it
if asked to draw a labbeled diagram of male reproductive system in exam , which one we hav to write ...
there r 2 diagrams in textbook ...
pls answer asap
URGENT!! Define seminal vessicles ,,,prostate gland and cowper's gland.????
(a) Cutting
(b) Layering
(c) Grafting
(d) Gootee
2. Anemophily refers to the pollination by (1Mark)
(a) Wind
(b) Water
(c) Animals
(d) Insects
3. A typical angiospemric embryosac is 8-nucleate and (1Mark)
(a) Single celled
(b) Seven celled
(c) Eight celled
(d) Four celled
4. Which of the is a start codon? (1Mark)
(a) UAA
(b) UAC
(c) AUG
(d) UAG
5. An unorganised mass of cells produced by ex-plant is called (1Mark)
(a) Callus
(b) Embryoid
(c) Somatic hybrid
(d) Protoplast
6. What is parthenogenesis considered as a special mode of reproduction in plants? (2Mark)
7. Differentiate between autogamy and geitonogamy. (2Mark)
8. State the two laws of thermodynamics to explain the flow of energy in an ecosystem. (2Mark)
9.
a. Draw a neat labelled diagram of the two-dimensional structure of t-RNA.
Or (3Mark)
b. Draw the chemical structure of ribose and deoxyribose sugar of nucleotides.
10. What are single cell proteins? Write two significance of single cell protein. (3Mark)
11. What are primary pollutants and secondary pollutants? Give examples. (3Mark)
12.
a. Explain the sequence of events during DNA replication.
Or (3Mark)
b. Explain the technique of DNA fingerprinting.
13.
a. What are cloning vectors? Describe the characteristics of a cloning vector.
Or (5Mark)
b. What are restriction endonuclease enzymes? Explain how restriction endonuclease enzymes are named.
14.
a. Define the term biodiversity. Enumerate the factors responsible for the loss of biodiversity.
Or (5Mark)
b. What is green house effect? Describe briefly the effects of global warming.
PART-B
1. At which stage, the implantation in uterus takes place? (1Mark)
(a) 8-cell stage
(b) Morula
(c) Blastocyst
(d) Late gastrula
2. The sterilization in males is performed surgically by (1Mark)
(a) Tubectomy
(b) Vasectomy
(c) Laparotomy
(d) Hysterectomy
3. A typical 1:2:1 phenotypic ratio in a monohybrid cross is a characteristic of (1Mark)
(a) Incomplete dominance
(b) Co-dominance
(c) Law of dominance
(d) Law of segregation
4. The antibiotic penicillin in produced from (1Mark)
(a) Bacteria
(b) Fungi
(c) Lichen
(d) Algae
5. Who coined the term ecology? (1Mark)
(a) Odum
(b) Ernst Haekal
(c) Arthur Tansley
(d) Darwin
6. Differentiate between homologous and analogous organs. (2Mark)
7. Give two important features of acquired immunity. (2Mark)
8. Define biowar. Give two examples of biological agents. (2Mark)
9.
(a) What is pedigree analysis? List any two advantages
Or (3Mark)
(b) what are the similarities found between man and great apes on the basis of molecular studies?
10. What is a transgenic animal? Give any two applications of transgenic animals. (3Mark)
11. What is commensalism? Explain with the help of an example. (3Mark)
12.
(a) Define spermatogenesis. Explain in brief the various stages of spermatogenesis.
Or (5Mark)
(b) Give the full form of ART. Explain any four techniques used in ART.
13.
(a) What is cancer? Explain four ways of treating cancer.
Or (5Mark)
(b) What are biofertilisers? Explain how fungi act as a biofertiliser
Answer all the question
dear experts
1.why is oogenesis considered as a discontinous and wasteful process?
2.is ejaculation and insemination the same ?
3.what is monospermy?
4.how implantation takes place ?
does menstruation occur even after tubectomy in females?? and does ovulation too occurs??
Layers of ovum from outside to inside are .
A. Corona radiata, zona pellucida, vitelline membrane
B. Zona pellucida, corona radiata, vitelline membrane
C. Vitelline membrane, zona pellucida, corona radiata
D. Zona pellucida, vitelline membrane, corona radiate
pls explain with diagram as nothing is mentioned nywhere about vitelline membrane.
What is the difference between blastulation and gastrulation?
the seminiferous tubules of the testis are lined by the germinal epithelium consisting of.......?
After a successful in vitro fertilization the fertilized egg begins for begins to divide where is this egg transferred before it reaches the 8 cell stage What is the techniques?