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Human Reproduction Test 15

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Human Reproduction Test 15
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  • Question 1
    1 / -0

    Study the given diagram and answer any of the four questions given below :

    Identify the parts labelled 1, 2 and 3 in the diagram given.

    Solution

    1. Placental villi having finger like projections

    2. The umbilical cord is a tube that connects you to your baby during pregnancy.

    3. The yolk sac is a membranous sac attached to an embryo.

  • Question 2
    1 / -0

    Read the following text and answer the following questions on the basis of the same: During sexual reproduction, the male inserts the sperm into the female reproductive tract, and sperm receive by the ovary and after that sperm fuse with the egg (ovum) in the ampullary region, this process is called fertilization, haploid nucleus of sperm fuse with that of ovum to form Diploid zygote.

    The phenomenon of sperm activation in mammals is known as.

    Solution

    This step is a biochemical event, in which the acrosome reaction occurs so, the reaction can penetrate the zona pellucida of the oocyte and fertilize with an egg (ovum).

  • Question 3
    1 / -0

    Directions : In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :

    Assertion (A) : Blastocyst undergoes gastrulation to form three germinal layers.

    Reason (R) : This involves cell movements (morphogenetic movement) that help to attain new

    shape and morphology of embryo.

    Solution

    During gastrulation, the blastula reorganizes cells migrate to the interior of the

    embryo, forming the three germ layers.

  • Question 4
    1 / -0

    Study the given diagram and answer any of the four questions given below :

    During embryonic development which of the following is formed first ?

    Solution

    During embryonic development Neural tube formed first, it is the embryonic precursor to the central nervous system.

  • Question 5
    1 / -0

    Read the following text and answer the following questions on the basis of the same: During sexual reproduction, the male inserts the sperm into the female reproductive tract, and sperm receive by the ovary and after that sperm fuse with the egg (ovum) in the ampullary region, this process is called fertilization, haploid nucleus of sperm fuse with that of ovum to form Diploid zygote.

    Fertilization take place in :

    Solution

    Fusion of sperm with an egg is known as fertilization, most of the time student’s think that this process is occur in ovary but that’s not true it actually occur In the fallopian tube that links an ovary to the uterus fertilized egg successfully travels down the fallopian tube and implants in the uterus.

  • Question 6
    1 / -0

    Read the following text and answer the following questions on the basis of the same: Read the passage and answer any four questions : Implantation is the embedding of the blastocyst into the endometrium of the uterus. Blastocyst is a ball of cells with a large, fluid-filled cavity called the blastocoel. The blastomeres in the blastocyst are arranged into an outer layer called trophoblast and inner cell mass. With the formation of blastocoel, morula is converted to blastula which is called blastocyst in mammals.

    State of embryo development, in which implantation occurs in human female is :

    Solution

    Blastocyst implant in the uterus, normally developing embryo will contain about six to 10 cells,

  • Question 7
    1 / -0

    Study the given diagram and answer any of the four questions given below :

    The signals for parturition originate from :

    Solution

    The signals for parturition originate from Placenta as well as fully developed foetus,which prompt little uterine contraction is known as foetal expulsion reflex

  • Question 8
    1 / -0

    Read the following text and answer the following questions on the basis of the same: During sexual reproduction, the male inserts the sperm into the female reproductive tract, and sperm receive by the ovary and after that sperm fuse with the egg (ovum) in the ampullary region, this process is called fertilization, haploid nucleus of sperm fuse with that of ovum to form Diploid zygote.

    Egg development without fertilization is known as

    Solution

    Parthenogenesis is a method in which a new individual developed without fertilization, and there is no involvement of male gamete. e.g., Honey bee and drosophila etc.

  • Question 9
    1 / -0

    Read the following text and answer the following questions on the basis of the same: Read the passage and answer any four questions : Implantation is the embedding of the blastocyst into the endometrium of the uterus. Blastocyst is a ball of cells with a large, fluid-filled cavity called the blastocoel. The blastomeres in the blastocyst are arranged into an outer layer called trophoblast and inner cell mass. With the formation of blastocoel, morula is converted to blastula which is called blastocyst in mammals.

    Which organ is formed during gastrulation ?

    Solution

    The primary gut that forms during gastrulation in the developing zygote is known as the archenteron.

  • Question 10
    1 / -0

    Study the given diagram and answer any of the four questions given below :

    Hormones secreted by the placenta to maintain pregnancy are :

    Solution

    hCG, progesterone, estrogens and human placental lactogen, are secreted by the placenta during pregnancy.

  • Question 11
    1 / -0

    Read the following text and answer the following questions on the basis of the same: During sexual reproduction, the male inserts the sperm into the female reproductive tract, and sperm receive by the ovary and after that sperm fuse with the egg (ovum) in the ampullary region, this process is called fertilization, haploid nucleus of sperm fuse with that of ovum to form Diploid zygote.

    Site of fusion of sperm with an ovum.

    Solution

    Fallopian tube has three parts first is isthmus second is ampulla (ampullary – isthmic junction) is the most common site for fertilization and the third is infundibulum which is farthest from the uterus, and the first cleavage division of zygote occurs in the ampullary-isthmic junction.

  • Question 12
    1 / -0

    Read the following text and answer the following questions on the basis of the same: Read the passage and answer any four questions : Implantation is the embedding of the blastocyst into the endometrium of the uterus. Blastocyst is a ball of cells with a large, fluid-filled cavity called the blastocoel. The blastomeres in the blastocyst are arranged into an outer layer called trophoblast and inner cell mass. With the formation of blastocoel, morula is converted to blastula which is called blastocyst in mammals.

    The process that transforms the embryo into a three-layered stage is called............. .

    Solution

    The process that transforms the embryo into a three-layered stage is called gastrulation (a phase early in the embryonic development of most animals).

  • Question 13
    1 / -0

    Study the given diagram and answer any of the four questions given below :

    Gestation period in human is :

    Solution

    The average length of human gestation is 38 weeks, from the first day of the woman's last menstrual period.

  • Question 14
    1 / -0

    Directions : In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :

    Assertion (A) : All copulations do not lead to fertilisation and pregnancy.

    Reason (R) : Fertilisation can occur only if the ovum and sperms are transported simultaneously to the ampullary-isthmic junction.

    Solution

    Fertilisation can only occur if the ovum and sperms are transported simultaneously to the ampullary-isthmic junction and ovum is released only once a month. This is one of the reasons why all copulations do not lead to fertilisation and pregnancy.

  • Question 15
    1 / -0

    Read the following text and answer the following questions on the basis of the same: Read the passage and answer any four questions : Implantation is the embedding of the blastocyst into the endometrium of the uterus. Blastocyst is a ball of cells with a large, fluid-filled cavity called the blastocoel. The blastomeres in the blastocyst are arranged into an outer layer called trophoblast and inner cell mass. With the formation of blastocoel, morula is converted to blastula which is called blastocyst in mammals.

    The ectoderm cells will form the.......................... .

    Solution

    Ectodermal cells form the central nervous system.

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