Description : In vitro fertilisation is a technique that involves transfer of which one of the following into the fallopian tube? (a) Embryo only, upto 8 cell stage (b) Either zygote or early embryo upto 8 cell stage (c) Embryo of 32 cell stage (d) Zygote only
Last Answer : (b) Either zygote or early embryo upto 8 cell stage
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 : Embryo at 16-celled stage is called
Last Answer : Embryo at 16-celled stage is called A. Morula B. Blastula C. Blastomere D. Gastrula.
Description : After the neurula stage and from its ventral portion to the dorsal how can the morphology of the embryo be described ?
Last Answer : In a schematic longitudinal section of the embryo after the neurula stage, the outermost layer of cells is the ectoderm. In the ventral region comes the archenteron tube formed of endodermal cells. In both ... is the notochord. In the dorsal region just above the notochord lies the neural tube.
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 : Which is the most common type of embryo sac in angiosperms ? (a) Tetrasporic with one mitotic stage of divisions (b) Monosporic with three sequential mitotic divisions (c) Monosporic with two sequential mitotic divisions (d) Bisporic with two sequential mitotic divisions
Last Answer : (b) Monosporic with three sequential mitotic divisions
Description : AT WHAT STAGE IS THE MAMMALIAN EMBRYO IMPLANTED IN THE UTERUS ?
Last Answer : ANS. AT THE BLASTOCYST STAGE.
Description : Mention the component cells of an embryo sac of angiosperms -Biology
Last Answer : answer:
Description : In polygonum type of embryo sac, the cells are
Last Answer : In polygonum type of embryo sac, the cells are A. Haploid B. Diploid C. Both A and B D. Poiyploid
Description : When all cells in the embryo of a multicellular organism are identical. later in development the cells become specialized through a process called?
Last Answer : What is the answer ?
Description : With reference to plant tissue culture select the matching pair: (1) Sterile triploid—banana and seedless fruit (2) Somaclonal variations—differences appearing (3) Embryoids—non-zygatic embryo produced from somatic cells (4) Pulses—belong to cruciferae
Last Answer : Ans. ((a))
Description : Haploid cells belong to: (a) Integument, pollen grain, endosperm (b) Embryo, endosperm and pollen grain (c) Megaspore, pollen grain, antipodal (d) Integument, pollen grain and antipodal
Last Answer : Ans. ((c))
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 : Cells become variable in morphology and function in different regions of the embryo. The process is (a) differentiation (b) metamorphosis (c) organisation (d) rearrangement.
Last Answer : (a) differentiation
Description : What is true for cleavage? (a) Size of embryo increases (b) Size of cells decreases (c) Size of cells increases (d) Size of embryo decreases
Last Answer : (b) Size of cells decreases
Description : In majority of angiosperms, (a) egg has a filiform apparatus (b) there are numerous antipodal cells (c) reduction division occurs in the megaspore mother cells (d) a small central cell is present in that embryo sac.
Last Answer : (c) reduction division occurs in the megaspore mother cells
Description : Callus is a. Tissue that forms embryo b. An insoluble carbohydrate c. Tissue that grows to form embryoid d. Unorganized actively dividing mass of cells maintained in cultured
Last Answer : d. Unorganized actively dividing mass of cells maintained in cultured
Description : When embryo arises directly from the (2n) sporophytic cells like nucellus or integuments it is called as
Last Answer : When embryo arises directly from the (2n) sporophytic cells like nucellus or integuments it is called as – Adventive embryony
Description : Stem cells which are capable of developing into other types of cells come from the (1) roots (2) stem (3) embryo (4) flower
Last Answer : embryo
Description : Which is not the main feature of DEC Alpha: a. 64 Bit RISC processor b. Designed to replace 32 VAX(CISC) c. Seven stage split integer/floating point pipeline d. Variable Instruction length
Last Answer : d. Variable Instruction length
Description : Schizont stage of Plasmodium occurs in human (a) erythrocytes (b) liver cells (c) erythrocytes and liver cells (d) erythrocytes, liver cells and spleen cells
Last Answer : (c) erythrocytes and liver cells
Description : Embryo and fetus: tissue or unborn human?
Last Answer : Flamebait.
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 : (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 : Mention the function of trophoblast in human embryo. -Biology
Last Answer : Trophoblast is the outer layer of blastocyst which helps in attachment of blastocyst to the endometrium of the uterus.
Description : What is height and weight of twelve week old human embryo
Last Answer : What is height and weight of twelve week old human embryo A. 7.5cm,650gm B. 42cm,1800gm C. 7.5cm,14gm D. 32cm,650gm.
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 : In human embryo the extra embryonic membrane are formed by :
Last Answer : In human embryo the extra embryonic membrane are formed by : A. Inner cell wall B. Trophoblast C. Formative cells D. Foillcless cells
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 : How many mitotic divisions are needed for a single cell to make 128 cells? (a) 28 (b) 32 (c) 7 (d) 14
Last Answer : (c) 7
Description : A bacterium divides every 35 minutes. If a culture containing 105 cells per mL is grown for 175 minutes, what will be the cell concentration per mL after 175 minutes? (a) 35 × 105 cells (b) 32 × 105 cells (c) 175 × 105 cells (d) 85 × 105 cells
Last Answer : b) 32 × 105 cells
Last Answer : (b) 32 × 105 cells
Description : In which stage of development the embryonic cells form the germinal layers by the movement
Last Answer : In which stage of development the embryonic cells form the germinal layers by the movement A. Morula B. Blastula C. Gastrula D. Zygote
Description : Which one is correct for `G_(0)` stage ? I. It is a quiescent stage. II. In this phase cell cycle is stopped III. `G_(0)` cells do not grow or prolife
Last Answer : Which one is correct for `G_(0)` stage ? I. It is a quiescent stage. II. In this phase cell cycle ... . I,II are correct D. Only I and IV are correct
Description : In which stage of the cell cycle are histone proteins synthesised in a eukaryotic cells ?
Last Answer : In which stage of the cell cycle are histone proteins synthesised in a eukaryotic cells ? A. ... )` -stage of prophase D. During entire prophase
Description : In which stage of the cell cycle do eukaryotic cells spend most of their life?
Last Answer : Need answer
Description : If this stage did not occur daughter cells would have insufficient amounts of DNA?
Last Answer : Feel Free to Answer
Description : Physiologically the cells are active and are synthesizing new protoplasm in which stage of the growth in bacteria a. Log phase b. Lag phase c. Stationary phase d. None of these
Last Answer : Ans: C
Description : Cells are active and synthesizing new protoplasm. This stage of growth is called a. Lag phase b. Stationary phase c. Log phase d. All of these
Last Answer : Ans: A
Description : What are the cells produced in the first stage of the embryonic development called ?
Last Answer : The cells that resulted from the cleavage (the first stage of the embryonic development) are called blastomeres. In this stage the embryo is called morula (similar to a “morus”, mulberry).
Last Answer : The cells that resulted from the cleavage (the first stage of the embryonic development) are called blastomeres. In this stage the embryo is called morula (similar to a “morus”, mulberry). Image Diversity: morula
Description : What is the evolutionary advantage of the occurrence of sperm cells and larval stage in the life cycle of sponges?
Last Answer : The sexual reproduction in sponges, in addition to contributing to genetic variability, also facilitates the colonization of farther environments by these beings, since sperm cells and larvae are mobile and can swim in the exterior to compensate the immobility of the adult individual.
Description : A cell at telophase stage is observed by a student in a plant brought from the field. He tells his teacher that this cell is not like other cells at telophase stage. There is no formation of ... cells. This would result in (a) somaclonal variation (b) polyteny (c) aneuploidy (d) polyploidy.
Last Answer : (d) polyploidy.
Description : In cloning of cattle a fertilized egg is taken out of the mother's womb and (a) in the eight cell stage, cells are separated and cultured until small embryos are formed which are implanted into the ... d) the egg is divided into 4 pairs of cells which are implanted into the womb of other cows.
Last Answer : (a) in the eight cell stage, cells are separated and cultured until small embryos are formed which are implanted into the womb of other cows
Description : At which stage of HIV infection does one usually show symptoms of AIDS? (a) Within 15 days of sexual contact with an infected person (b) When the infected retro virus enters host cells (c) ... large number of helper T - lymphocytes (d) When the viral DNA is produced by reverse transcriptase
Last Answer : (c) When HIV damages large number of helper T - lymphocytes
Description : A stage in cell division is shown in the figure. Select the answer which gives correct identification of the stage with its characteristics. (a) Cytokinesis Cell plate formed, mitochondria ... reforms. (d) Late anaphase Chromosomes move away from equatorial plate, Golgi complex not present.
Last Answer : (c) Telophase Nuclear envelope reforms,Golgi complex reforms.
Description : Some dividing cells exit the cell cycle and enter vegetative inactive stage. This is called quiescent stage (G0). This process occurs at the end of (a) M phase (b) G1 phase (c) S phase (d) G2 phase.
Last Answer : (b) G1 phase