Description : During pregnancy degeneration of corpus luteum is prevented by the hormone
Last Answer : During pregnancy degeneration of corpus luteum is prevented by the hormone A. hCG B. hPL C. LH, estrogen and estradiol D. Relaxin.
Description : NAME THE PROTECTIVE SUBSTANCE PRESENT IN THE POLLEN ENVELOPE TO TIDE OVER ADVERSE CONDITIONS.
Last Answer : ANS. SPOROPOLLENIN.
Description : DESCRIBE THE PROCESS OF OOGENESIS IN HUMAN FEMALE AND DIFFERENTIATE IT WITH SPERMATOGENESIS ON THE BASIS OF TIME OF INITIATION AND THE PRODUCTS FORMED.
Last Answer : ANS. OOGENESIS : DIAGRAMMATIC REPRESENTATION AS GIVEN IN NCERT. DIFFERENCES BETWEEN : OOGENESIS SPERMATOGENESIS (i) STARTS DURING FOETAL LIFE (i) STARTS DURING PUBERTY (ii)PRODUCTS: OVUM (ii) SPERMS
Description : (a) IN WHICH PART OF HUMAN FEMALE REPRODUCTIVE SYSTEM DO THE FOLLOWING EVENTS TAKE PLACE. (i) RELEASE OF FIRST POLAR BODY (ii) RELEASE OF SECOND POLAR BODY (iii) FERTILISATION (iv) IMPLANTATION (b) NAME TWO HORMONES SECREATED ONLY DURING PREGNANCY.
Last Answer : ANS (a) (i) OVARY (ii) FALLOPIAN TUBE (iii) AMPULLA-ISTHAMUS JUNCTION OF FALLOPIAN TUBE (iv) ENDOMETRIUM LINING OF UTERUS (b) HUMAN CHORIONIC GONADOTROPIN AND HUMAN PLACENTAL LACTOGEN
Description : WHAT IS APOMIXIS? DESCRIBE ITS IMPORTANCE?
Last Answer : ANS. IT IS THE PROCESS OF DEVELOPMENT OF SEEDS WITHOUT FERTILISATION. EXAMPLE: SOME SPECIES OF ASTERACEAE AND GRASSES. IMPORTANCE: APOMICTIC GENES CAN BE INTRDUED IN HYBRID SEED INDUSTRY.
Description : (A) MENTION ANY FOUR STRATEGIES ADOPTED BY FLOWERING PLANTS TO PREVENT SELF-POLLINATION. (B) DEFINE THE TERM EMASCULATION.
Last Answer : ANS.(a) (i) SELF INCOMPATIBILITY (ii) PRODUCTION OF UNICELLULAR FLOWERS (iii) ANTHERS AND STIGMA ARE PLACED AT DIFFERENT POSITIONS. (iv) MATURATION OF ANTHER AND STIGMA IS NOT ... EMASCULATION: REMOVAL OF ANTHER BEFORE MATURITY SO AS TO ENSURE CROSS POLLINATION IN SELF POLLINATING FLOWERS.
Description : DESCRIBE THE CONTRACEPTIVE ACTIONS OF IUDs.
Last Answer : ANS. (i) INCREASES PHAGOCYTOSIS OF SPERMS (ii) SUPPRESS SPERM MOTILITY (iii) SUPPRESS FERTILISING CAPACITY OF SPERMS (iv) MAKES CERVIX HOSTILE TO SPERMS.
Description : DIFFERENTIATE BETWEEN MORULA AND BLASTULA STAGES OF MAMMALIAN EMBRYO.
Last Answer : ANS. MORULA: (i) 8 TO 16 CELLED STAGE EMBRYO (ii) SOLID WITHOUT ANY CAVITY BLASTULA: (i) 32 CELLED STAGE EMBRYO. (ii) HOLLOW WITH A CAVITY CALLED BLASTOCOEL
Description : WRITE THE FUNTION OF EACH OF THE FOLLOWING: (a) MIDDLE PIECE OF HUMAN SPERM (b) LUTEINIZING HORMONE IN HUMAN MALES
Last Answer : ANS. (a) PROVIDES ENERGY FOR MOVEMENT DUE TO PRESENCE OF MITOCHONDRIA. (c) STIMULATES SYNTHESIS AND SECRETION OF ANDROGENS.
Description : STATE ONE ADVANTAGE AND ONE DISADVANTAGE OF CLEISTOGAMY.
Last Answer : ANS. ADVANTAGE: ASSURED SEED SET DISADVANTAGE: INBREEDING DEPRESSION.
Description : WHY IS THE PROCESS OF FERTILISATION IN A FLOWERING PLANT REFFERED TO AS DOUBLE FERTILISATION ?
Last Answer : ANS. DOUBLE FERTILISATION= SYNGAMY + TRIPLE FUSION SYNGAMY= ONE MALE GAMETE + EGG--- ZYGOTE(n) TRIPLE FUSION= ANOTHER MALE GAMETE+ POLAR NUCLEI-PRIMARY ENOSPERM NUCLEUS(3n)
Description : WHEN DO THE OOGENESIS AND THE SPERMATOGENESIS INITIATE IN HUMAN FEMALES AND MALES RESPECTIVELY ?
Last Answer : ANS. OOGENESIS AT THE FOETAL LIFEAND SPERMATOGENISIS STARTS AT PUBERTY.
Description : WRITE THE LOCATION AND FUNCTION OF SERTOLI CELLS IN HUMANS.
Last Answer : ANS. IN THE SEMINIFEROUS TUBULES OF TESTIS, NOURISHES DEVELOPING SPERMS.
Description : AT WHAT STAGE IS THE MAMMALIAN EMBRYO IMPLANTED IN THE UTERUS ?
Last Answer : ANS. AT THE BLASTOCYST STAGE.
Description : NAME THE TYPE OF FLOWER WHICH FAVOURS CROSS POLLINATION.
Last Answer : ANS. CHASMOGAMOUS.
Description : WHAT IS PERISPERM ?
Last Answer : ANS. THE RESIDUAL NUCELLUS, WHICH PERSISTS IN THE SEEDS IS CALLED AS PERISPERM.
Description : NAME THE PHENOMENON AND ONE BIRD WHERE THE FEMALE GAMETE DIRECTLY DEVELOPS INTO A NEW ORGANISM.
Last Answer : ANS. PARTHENOGENESIS, TURKEY.
Description : WHY ARE DATE PALMS REFFERED TO AS DIOECIOUS ?
Last Answer : ANS. BECAUSE THEY HAVE UNISEXUAL FLOWERS BORNE ON SEPARATE PLANTS.
Description : WHAT TERM IS GIVEN BY YOU TO THE GROUP OF INDIVIDUALS WHICH ARE GENETICALLY AND MORPHOLOGICALLY IDENTICAL ?
Last Answer : ANS. CLONE
Description : Draw a diagrammatic sectional view of human ovary showing different stages of oogenesis along with corpus luteum. (ii) Where is morula formed in human? Explain the process of its development from zygote. -Biology
Last Answer : (i) Sectional view of human ovary. (ii) Morula is formed in the (a)Isthmus of the oviduct (Fallopiantube). (b)The zygote undergoes mitotic divisions in quick succession called cleavage, forming 2, 4 ... 8-16 blastomeres is called a morula and the inner cell mass gets ready to form the embryo proper.
Description : What is corpus luteum? -Biology
Last Answer : answer:
Description : What is corpus luteum ?
Last Answer : : The part of the graphene follicle that is in the ovary after ovulation is called corpus lutea .
Description : Corpus luteum releases
Last Answer : Corpus luteum releases A. Androgen B. Progesterone C. Estrogen D. Both B and C.
Description : Which hormone is not produced by corpus luteum
Last Answer : Which hormone is not produced by corpus luteum A. Progesterone B. Estradiol C. Inhibin D. Relaxin
Description : Assertion. Corpus luteum is produced by Graafian follicle after ovulation Reason. It secretes estrogen which is necessory to maintain pregnancy.
Last Answer : Assertion. Corpus luteum is produced by Graafian follicle after ovulation Reason. It secretes estrogen which is necessory to ... A. A B. B C. C D. D
Description : Corpus luteum produces
Last Answer : Corpus luteum produces A. Lutenizing hormone B. Progesterone C. Luteotrophic hormone D. Inhibin.
Description : Distingeration of corpus luteum occurs due to inhibiton of secretion of hormone
Last Answer : Distingeration of corpus luteum occurs due to inhibiton of secretion of hormone A. LTH B. FSH C. Progesterone D. LH.
Description : Assertion : If fertilization dies not occur than the corpus luteum begins to degenerate . Reason : The levels of progesterone and estrogen decline due
Last Answer : Assertion : If fertilization dies not occur than the corpus luteum begins to degenerate . Reason : The ... D. If both Assertion & Reason are False.
Description : Assertion : Estrogen level is high during the follicular phase of menstrual cycle . Reason : During this phase corpus luteum secrete large amount of e
Last Answer : Assertion : Estrogen level is high during the follicular phase of menstrual cycle . Reason : During this ... D. If both Assertion & Reason are False.
Description : Assertion : After ovulation ruptured graafian follicle transforms into corpus luteum . Reason : Corpus luteum act as endocrine gland and it is stable
Last Answer : Assertion : After ovulation ruptured graafian follicle transforms into corpus luteum . Reason : Corpus ... If both Assertion & Reason are False.
Description : Assertion : Corpus luteum is present in proliferative phase of menstrual cycle . Reason : High concentration of progesterone is present in proliferati
Last Answer : Assertion : Corpus luteum is present in proliferative phase of menstrual cycle . Reason : High ... . If both Assertion & Reason are False.
Description : Assertion : After fertilization corpus luteum is stable till parturition . Reason : After 3 months of intrauterine , life it dominantly secretes proge
Last Answer : Assertion : After fertilization corpus luteum is stable till parturition . Reason : After 3 months of ... D. If both Assertion & Reason are False.
Description : Assertion : In post natal life , oocyte development occurs in mature follicle Reason : After ovulation , Graafian follicle transforms in corpus luteum
Last Answer : Assertion : In post natal life , oocyte development occurs in mature follicle Reason : After ovulation , ... D. If both Assertion & Reason are False.
Description : In mammals corpus luteum is found in which organ
Last Answer : In mammals corpus luteum is found in which organ A. Brain B. Ovary C. Liver D. Eyes
Description : In which phase of menstrual cycle Graafian follide transform as the corpus luteum.
Last Answer : In which phase of menstrual cycle Graafian follide transform as the corpus luteum. A. Luteal B. Proliferation C. Follicular D. Growth
Description : The main function of mammalian corpus luteum is to produce:
Last Answer : The main function of mammalian corpus luteum is to produce: A. estrogen only B. progesterone C. human chorionic gonadotropin D. relaxin only
Description : Yellow corpus luteum occurs in a mammals in
Last Answer : Yellow corpus luteum occurs in a mammals in A. Heart to initiate heart beat B. Skin ... cerebral hemispheres D. Ovary for secretion of progesterone.
Description : Corpus luteum is
Last Answer : Corpus luteum is A. Excretory B. Endocrine C. Digestive D. Reproductive
Description : Which induces the development of corpus luteum :
Last Answer : Which induces the development of corpus luteum : A. LH B. Oestrogen C. FSH D. LTH
Description : In case of nonfertilization , corpus luteum
Last Answer : In case of nonfertilization , corpus luteum A. Stops secreting progesterone B. Changes to corpus ... producing progesterone D. None of the above
Description : Corpus luteum develops from
Last Answer : Corpus luteum develops from A. Oocyte B. Nephrostome C. Graafian follicle D. Antrum
Description : Assertion : Inhibin is secreted by the corpus luteum. Reason : They inhibit the FSH and GnRH production.
Last Answer : Assertion : Inhibin is secreted by the corpus luteum. Reason : They inhibit the FSH and GnRH ... D. If both Assertion and Reason are false.
Description : Assertion : Chorionic gonadotrophin prevents corpus luteum from involuting. Reason : It has the property similar to luteinzing hormone.
Last Answer : Assertion : Chorionic gonadotrophin prevents corpus luteum from involuting. Reason : It has the property ... If both Assertion and Reason are false.
Description : During late pregnancy, the major source of progesterone is (A) Adrenal cortex (B) Placenta (C) Corpus luteum (D) Graafian follicles
Last Answer : Answer : B
Description : A hormone produced by corpus luteum and placenta, concerned with relaxation of pelvis tissue is (A) HCG (B) Chorionic somatommotropin (C) Relaxin (D) Progestins
Last Answer : Answer : C
Description : The production of progesterone by corpus luteum cell is stimulated by (A) LH (B) TSH (C) ACTH (D) MSH
Last Answer : Answer : A
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 : Blood pressure is controlled by – (1) Adrenal gland (2) Thyroid gland (3) Thymus (4) Corpus luteum
Last Answer : (1) Adrenal gland Explanation: Adrenaline directly affects, regulates and determines the body's ability to maintain a healthy blood pressure. When the adrenal gland becomes damaged or ... greatly increases blood pressure levels, causing severe headaches, weight loss and other serious problems.