Description : In human female, the blastocyst (a) forms placenta even before implantation (b) gets implanted into uterus 3 days after ovulation (c) gets nutrition from uterine endometrial secretion only after implantation (d) gets implanted in endometrium by the trophoblast cells.
Last Answer : (d) gets implanted in endometrium by the trophoblast cells.
Description : Describe the post-zygotic events leading to implantation and placenta formation in humans. Mention any two functions of placenta. [All India 2010] or Explain the process of fertilisation in human female ... events in a sequential order up to implantation of the embryo. [Foreign 2010] -Biology
Last Answer : Post-zygotic events leading to implantation and placenta formation. After implantation of blastocyst, the finger-like projections called chorionic villi, appear on the trophoblast and is surrounded by ... acts as an endocrine gland and secretes hormones like hPL, hCG, oestrogen and progesterone.
Description : Statement S. After implantation, the uterine endometrium undergoes changes to become decidus Reason R. the placenta in described as deciduous type Cor
Last Answer : Statement S. After implantation, the uterine endometrium undergoes changes to become decidus Reason R. the ... and R is a correct explanation to S.
Description : Select the option which correctly matches the endocrine gland with its hormone and its function. Endocrine Hormone Function gland (a) Placenta Estrogen Initiates secretion of the milk (b) Corpus ... of sperms (d) Ovary FSH Stimulates follicular development and the secretion of estrogens
Last Answer : (c) Leydig’s Androgen Initiates the cells production of sperms
Description : Which extraembryonic membrane in humans prevents desiccation of the embryo inside the uterus? (a) Yolk sac (b) Amnion (c) Chorion (d) Allantosis
Last Answer : (b) Amnion
Description : In uterus , endometrium , proliferates in response to
Last Answer : In uterus , endometrium , proliferates in response to A. Relaxin B. Oxytocin C. Progesterone D. Oestrogen
Description : Lining of uterus (Endometrium) is : -
Last Answer : Lining of uterus (Endometrium) is : - A. St. squamous B. Simple squamous C. Simple columnar epithelium D. Ciliated Pseudostratifed
Description : During pregnancy, corpus luteum, having secreted increasing quantities of progesterone that helps build up endometrium of the uterus, suddenly declines in functioning in the (a) 14th week (b) 16th week (c) 11th week (d) 12th week
Last Answer : Ans:(d)
Description : The figure given below depicts a diagrammatic sectional view of the human female reproductive system. Which set of three parts out of I-VI have been correctly identified? I II III V VI IV (a) (II) ... , (V) Uterus, (VI) Cervix (d) (I) Perimetrium, (II) Myometrium, (III) Fallopian tube
Last Answer : (b) (III) Infundibulum, (IV) Fimbriae, (V) Cervix
Description : Select the correct option describing gonadotropin activity in a normal pregnant female. (a) High level of FSH and LH stimulates the thickening of endometrium. (b) High level of FSH and LH ... synthesis of estrogen and progesterone. (d) High level of hCG stimulates the thickening of endometrium.
Last Answer : (c) High level of hCG stimulates the synthesis of estrogen and progesterone.
Description : What is the role of the uterus in the development of the fetus and the placenta?
Last Answer : The uterus is where the fetus develops and the placenta connects the uterus to the fetus.
Description : Food for the developing fetus is supplied by the – (1) Uterus (2) Placenta (3) Ovary (4) Allantosis
Last Answer : (2) Placenta Explanation: The placenta is an organ that connects the developing fetus to the uterine wall to allow nutrient uptake, waste elimination, and has exchange via the mother's blood ... the maternal blood supply. Nutrient transfer to the fetus occurs via both active and passive transport.
Description : Food for the developing foetus is supplied by the (1) Uterus (2) Placenta (3) Ovary (4) Allantosis
Last Answer : Placenta
Description : (i) When and how does placenta develop in human female? (ii)How is the placenta connected to the embryo? (iii)Placenta acts as an endocrine gland. Explain. -Biology
Last Answer : (i)Development of placenta in human female After implantation of blastocyst, the finger-like projections called chorionic villi, appear on the trophoblast and is surrounded by uterine tissue and ... Chorionic Gonadotropin) (b) hPL (human Placental Lactogen) (c) Oestrogens (d) Progesteronem
Description : In which trimester does the following occur A sac called a placenta forms around the embryo and is connected to the embryo with an umbilical cord.?
Last Answer : What is the answer ?
Description : The structure which helps in the nutrition of the Embryo is – (1) Yolk sac (2) Amniotic membrane (3) Crypts (4) Placenta
Last Answer : (1) Yolk sac Explanation: The yolk sac is a membranous sac attached to an embryo, providing early nourishment. It functions as the developmental circulatory system of the human embryo, ... It carries out transfer of nutrients in weeks 2 and 3 when the uteroplacental circulation is established
Description : Excretory products of mammalian embryo are eliminated out by - (1) Placenta (2) Amniotic fluid (3) Allantois (4) Ureter
Last Answer : (1) Placenta Explanation: The placenta is an organ that connects the developing fetus to the uterine wall to allow nutrient uptake, waste elimination, and gas exchange via the mother's blood ... are also found in some snakes and lizards with yawing levels of development up to mammalian levels.
Description : Which one of the following is not the function of placenta? (a) Facilitates removal of carbon dioxide and waste material from embryo (b) Secretes oxytocin during parturition (c) Facilitates supply of oxygen and nutrients to embryo (d) Secretes estrogen
Last Answer : (b) Secretes oxytocin during parturition
Description : What structure attaches the embryo to the placenta?
Last Answer : ANSWER: UMBILICAL CORD
Description : The structure which helps in the nutrition of the Embryo is (1) Yolk sac (2) Amniotic membrane (3) Crypts (4) Placenta
Last Answer : Yolk sac
Description : Excretory products of mammalian embryo are eliminated out by (1) Placenta (2) Amniotic fluid (3) Allantois (4) Ureter
Description : Study the given figure below and answer the question that follow important-questions-for-class-12-biology-cbse-fertilisation-pregnancy-and-embryonic-development-t-33-3 (i)Name the stage of human embryo the ... implantation in the uterus. (iv)Where are the stem cells located in this embryo? -Biology
Last Answer : (i)The stage is blastocyst. (ii) A—Trophoblast. It helps in attachment to endometrium during implantation and provides nourishment to developing embryo. (iii) Inner cell mass acts as precursor to embryo ... into ectoderm and endoderm. (iv) Stem cells are located in inner cell mass of embryo.
Description : Which extra-embryonic membrane in human prvents desiccation of the embryo inside the uterus?
Last Answer : Which extra-embryonic membrane in human prvents desiccation of the embryo inside the uterus? A. Yolk one B. Amnion C. Chorion D. Allantois.
Last Answer : Which extra-embryonic membrane in human prvents desiccation of the embryo inside the uterus? A. Yolk sac B. Amnion C. Chorion D. Allantois
Description : The term Test Tube Baby' implies (a) Fertilisation of ovum takes place I the test tube but it develops in uterus (b) Fertilisation of ovum takes place in the test tube and develops in ... uterus but develops in the test tube (d) Fertilisation takes place in uterus and embryo develops in uterus
Last Answer : Ans:(a)
Description : In the case of test tube babies (1) egg is fertilized in the uterus. (2) embryo completes its development in a test tube. (3) embryo is placed in uterus after 2 months. (4) egg is fertilized outside mother's body.
Last Answer : (3) embryo is placed in uterus after 2 months. Explanation: Prior of the implantation of the blastocyst the uterus of the recipient mother should be made ready to receive the embryo. This is ... done with the hormonal treatment. The blastocyst is introduced into the uterus by one of the two methods
Description : A test tube baby means : (1) a baby grown in a test tube. (2) embryo fertilised in uterus and developed in test tube. (3) embryo fertilised and developed in uterus. (4) fertilisation in vitro and then transplantation in the uterus.
Last Answer : (4) fertilisation in vitro and then transplantation in the uterus. Explanation: In vitro fertilisation is a process by which an egg is fertilised by sperm outside the body: in vitro. IVF is a ... to collect a naturally selected ovum (egg) for fertilisation, it is known as natural cycle IVF.
Description : Name the organ where the embryo develops - (1) Uterus (2) Fallopian tube (3) Ureter (4) Cervix
Last Answer : (3) Uterus Explanation: In a placental mammal, an ovam is fertilized in a fallopian tube through which it travels into the uterus.
Description : The test tube baby means (a) fertilisation and development both in uterus (b) fertilisation in vitro and then transplantation in uterus (c) a baby grown in test tube (d) fertilised and developed embryo in test tube.
Last Answer : (b) fertilisation in vitro and then transplantation in uterus
Description : The stage transferred into the uterus after induced fertilisation of ovum in the laboratory is (a) embryo at 4 blastomeres stage (b) embryo at 2 blastomeres stage (c) morula (d) zygote.
Last Answer : (c) morula
Description : Assisted reproductive technology, IVF involves transfer of (a) ovum into the fallopian tube (b) zygote into the fallopian tube (c) zygote into the uterus (d) embryo with 16 blastomeres into the fallopian tube.
Last Answer : b) zygote into the fallopian tube
Description : Embryo with more than 16 blastomeres formed due to in vitro fertilisation is transferred into (a) uterus (b) fallopian tube (c) fimbriae (d) cervix.
Last Answer : (a) uterus
Description : The permissible use of the technique amniocentesis is for (a) detecting sex of the unborn fetus (b) artificial insemination (c) transfer of embryo into the uterus of a surrogate mother (d) detecting any genetic abnormality.
Last Answer : (d) detecting any genetic abnormality.
Description : Ectopic pregnancies are referred to as (a) implantation of defective embryo in the uterus (b) pregnancies terminated due to hormonal imbalance (c) pregnancies with genetic abnormality (d) implantation of embryo at site other than uterus.
Last Answer : (d) implantation of embryo at site other than uterus.
Description : Given below are the events that lead to pregnancy and development of embryo i. fertilisation of egg ii. maturation of egg iii. release of egg iv. embedding of embryo in uterus a) i, ii, iii, iv b)ii, i, iii, iv c)i, iv , ii, iii d)ii, iii, i , iv,
Last Answer : d)ii, iii, i , iv,
Description : In human beings after fertilisation , the structure which gets embedded in the wall of uterus is a) ovum b)embryo c)foetus d)zygote
Last Answer : b)embryo
Description : 3. In IVF technique zygote or early embryo is transferred into a. Cervical canal b. Uterus c. Fallopian tube d. Vagina
Last Answer : c. Fallopian tube
Description : In a normal pregnant woman, the amount of total gonadotropin activity was assessed. The result expected was (1) High level of circulating HCG to stimulate estrogen and progesterone synthesis (2) ... endometrial thickening (4) High levels of FSH and LH in uterus to stimulate endometrial thickening
Last Answer : (1) High level of circulating HCG to stimulate estrogen and progesterone synthesis
Description : AT WHAT STAGE IS THE MAMMALIAN EMBRYO IMPLANTED IN THE UTERUS ?
Last Answer : ANS. AT THE BLASTOCYST STAGE.
Last Answer : fertilisation in vitro and then transplantation in the uterus.
Description : In the case of test tube babies (1) egg is fertilized in the uterus. (2) embryo completes its development in a test tube. (3) embryo is placed in uterus after 2 months. (4) egg is fertilized outside mother’s body.
Last Answer : embryo is placed in uterus after 2 months.
Description : Fertilisation in humans is practically feasible only if (a) the ovum and sperms are transported simultaneously to ampullary-isthmic junction of the cervix (b) the sperms are transported ... the ovum and sperms are transported simultaneously to ampullary-isthmic junction of the fallopian tube.
Last Answer : (d) the ovum and sperms are transported simultaneously to ampullary-isthmic junction of the fallopian tube.
Description : The extra embryonic membranes of the mammalian embryo are derived from (a) trophoblast (b) inner cell mass (c) formative cells (d) follicle cells
Last Answer : (a) trophoblast
Description : The amnion of mammalian embryo is derived from (a) ectoderm and mesoderm (b) endoderm and mesoderm (c) mesoderm and trophoblast (d) ectoderm and endoderm
Last Answer : (a) ectoderm and mesoderm
Description : The amnion of mammalian embryo is derived from (1) ectoderm and mesoderm (2) endoderm and mesoderm (3) mesoderm and trophoblast (4) ectoderm and endoderm
Last Answer : (1) ectoderm and mesoderm
Description : .The fetal ejection reflex in humans triggers the release of (a) oxytocin from fetal pituitary (b) human chorionic gonadotropin (hCG) from placenta (c) human placental lactogen (hPL) from placenta (d) oxytocin from maternal pituitary.
Last Answer : (d) oxytocin from maternal pituitary.
Description : Which one of the following is categorised as a parasite in true sense? (a) The female Anopheles bites and sucks blood from humans. (b) Human fetus developing inside the uterus draws nourishment from the mother. ... as laying eggs on human hair. (d) The cuckoo (koel) lays its eggs in crow's nest.
Last Answer : (c) Head louse living on the human scalp as well as laying eggs on human hair
Description : What is true about cleavage in the fertilised egg in humans? (a) It starts while the egg is in fallopian tube. (b) It starts when the egg reaches uterus. (c) It is meroblastic. (d) It is identical to the normal mitosis
Last Answer : (a) It starts while the egg is in fallopian tube
Description : In humans, the development of fertilised egg takes place in the a) ovary b)testis c)oviduct d)uterus
Last Answer : d)uterus
Description : In humans, the embryo is protected in
Last Answer : In humans, the embryo is protected in A. Peritoneal cavity B. Amniotic cavity C. Pleural cavity D. Allantois.