The _______ is an important structure for waste storage in birds and some mammals, but not in humans.A. allantoisB. yolk sacC. placentaD. umbilical cordE. amnion

Q: If an embryo splits at the two-cell stage, each of the resulting identical twins will have its own…

A: Identical twins:  The splitting up of the embryos into two at the two-cell stage leads to the…

Q: Placenta ... a) ... develops from trophoblast cells. b) ... develops from embryoblast cells. c)…

A: Pregnancy occurs when the male gamete sperm fuses and fertilizes with the female egg that is…

Q: The seven-day blastocyst: A. has a single layer of trophoblast at the embryonic pole B. has an…

A: The correct option is C.

Q: The first week of human development is characterized by formation of the: A. inner cell mass B.…

A: The correct option is E - all of the above

Q: umbilical cord is formed from the chori

A: Within the uterus, the cells start to divide and form a ball of cells known as the blastocyst. It…

Q: The umbilical cord connects the developing fetus to thea. mother’s belly button.b. placenta.c.…

A: Reproduction is the process by which an organism creates more of its own progeny. During…

Q: Nutrient and waste requirements for the developing fetus are handled during the first few weeks by:…

A: Endometrium is the innermost lining of the uterus which undergoes cyclic changes during…

Q: The presence or absence of testosterone determines whether a mammal will differentiate as a male or…

A: In, mammals, estrogen is a hormone which is required to sustain the pregnancy, in coordination with…

Q: The surface that enables active and passive exchange between the fetal and maternal bloodstreams is…

A: Answer is b.)  chorionic villi.

Q: What structural adaptation in chickens allows them to lay theireggs in arid environments rather than…

A: The vertebrate embryo requires an aqueous environment for their development. The amphibians and…

Q: Which of the following is required for successful fetal development after the egg has been…

A: When sperm successfully enters and fuses with the ovum fertilization occurs. This genetic material…

Q: The inner cell mass of a human blastocysta. gives rise to the chorion.b. gives rise to the…

A: Cell is the basic unit of life. Based on the number of cells an organism may be prokaryotic or…

Q: All fish, all birds and all mammals are A animals with internal fertilization. B carnivores. C…

A: Classification of animals includes the following phyla:Phylum - PoriferaPhylum - CnidariaPhylum -…

Q: During human gestation, rudiments of all organs develop (A) in the first trimester. (B) in the…

A: Gestation is the time required for the full development of a fetus. It is divided into pre-embryonic…

Q: Birds, reptiles and insects have something in common as far as the development of their embryos.…

A: Answer :- Birds, insects and reptiles are higher vertebrate . All of these are developed from…

Q: A baby born four weeks before its due date is most likely to have anunderdevelopeda. central nervous…

A: The central nervous system begins developing two weeks after fertilization and continues developing…

Q: At what stage uteroplacental circulation started?  a.Maternal blood entering the lacunar  b.Embryo…

A: The uteroplacental circulation is a circulatory framework where two circulation systems, the fetal…

Q: . The structure labeled C, within which development occurs, is known as the a. placenta. b. oviduct…

A: The picture is showing the foetus in the womb of mother.

Q: Fill in the blank:  After the eighth week, a developing human is called a(an) ___________________…

A: On the very first day of your last menstrual period Initially the stage comes when the start of the…

Q: For the first 8 weeks of gestation, a conceptus is nourished mainly by a. The placenta. b. Amniotic…

A: A conceptus receives nutrition is totally depends on the state. The foetus stage receives nutrition…

Q: In humans, the development of fertilised egg takes place in the: (a) ovary (b) testis (c) oviduct…

A: Fertilization in humans refers to the fusion of human sperm and egg. This process occurs in the…

Q: Blood islands first form in the embryonic:- a. spleen. d. liver. b. yolk sac. e. red bone marrow. c.…

A: Blood Islands are structures that form around the developing embryo and which give rise to the…

Q: . In humans, identical twins are possible because(A) extraembryonic cells interact with the zygote…

A: The identical twins are also referred to as monozygotic twins. This occurs from the fertilization of…

Q: The..........is a hollow ball of cells that develops from the morula. a) Blastocyst b) Oviduct c)…

A: The fusion of male gamete (haploid) and female gamete (haploid) is known as fertilization. It…

Q: The zona pellucida is important in mammals because it...

A: The zona pellucida is a thick extracellular layer that covers all mammalian eggs and preimplantation…

Q: After fertilisation, the resulting cell which gives rise to a new individual is the: (a) embryo (b)…

A: Fertilization is a process that occurs during reproduction in organisms. Reproduction is a process…

Q: In human embryogenesis, how many hours does it take after fertilization to form the following; a.…

A: Embryogenesis  Embryogenesis refers to the stages of developing embryo. The embryogenesis start just…

Q: Which of these produces blood cells and germ cells at the early stages of fetal development? O…

A: The yolk sac is responsible for producing blood cells and germ cells during the early stages of…

Q: Which of the following statements is not true about the placenta?  A. It provides exchange of wastes…

A: During pregnancy, inside the uterus, the organ placenta develops. It is found attached to the wall…

Q: In the development of the nervous system, one of the following is false? The neural tube maintains…

A: The vertebrate nervous system is framed in embryos. neural plate: A thick, level bundle of ectoderm…

Q: From which of the following is the embryo developed? Trophoblasts Inner cell mass Blastocoelen…

A: Embryo is formed from the  zygote and zygote is formed by the union of the male and female gametes.…

Q: In human development, an embryo is most sensitive to chemicals, radiation, and pathogens during the…

A: Need to find the best option from the given four options related to embryo.

Q: In human beings, after fertilisation, the structure which gets embedded in the wall of uterus is:…

A: Embryonic development is the process by which the embryo forms and develops. Embryonic development…

Q: Placenta is the structure formed: A. by the union of foetal and uterine tissue B. by foetus…

A: The uterus or womb is a hollow muscular organ which is located in the pelvis of female between the…

Q: Place the number corresponding to the correct germ layer in the blank.   ____ Mesoderm ____…

A: During gastrulation, the hollow sphere of balls called blastula develops into a gastrula.…

Q: The placenta is formed from ________.a. the embryo’s mesenchymal cellsb. the mother’s endometrium…

A: Placenta is defined as the organ that develops in the uterus of the women during pregnancy. The…

Q: This is the outermost layer that protects from water loss but allows for gas exchange: amnion…

A: An embryo is present at an early stage of the development of a multicellular organism. The formation…

Q: Explain the way in which the yolk amount affects the cleavage. Compare the Cleavage in a sea star…

A: Yolk  Yolk is a nutrient rich part of the egg which support the growth of developing embryo.

Q: Which statement relating to frog gastrulation is INCORRECT? a. A second set of bottle cells…

A: Embryonic development refers to the division in zygote and growth that ultimately goes through…

Q: An early stage embryo consisting of mutiple layers is a blastula O True False

A: In mammals, a blastula is an initial phase of embryonic development.

Q: During the embryonic developmen, the trophoblast will developed into  Select one: A. The embryonic…

A: Developmental biology focuses on the study of developmental sequences of organisms. The embryonic…

Q: explain the developmental processes that will happen to the fertilized ovum of a dog or any animal

A: The individual entity that embodies the attributes of life is known as an organism. There are two…

Q: Which of the following statements is NOT correct about the umbilical cord?   a. The umbilical cord…

A: There are 4 extraembryonic membranes that support the growing embryo namely the Yolk sac, Allantois,…

Q: ain The process of releasing of an egg from the ovary is called .

A: Ova (singular egg cell, from the Latin term egg cell, which means 'egg') is another name for egg…