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Reproduction System and Embryology Quiz-08

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NEET is the most famous and important medical entrance examination held in our country. This exam is an objective type, an offline test which includes 4 sections namely– Physics, Chemistry, Botany, and Zoology. The maximum marks that can be scored are 720 marks and have 180 questions. About half of the paper consists of questions from Biology, as the NEET exam essentially focuses on capacitating students to go for seats in medical courses. One of the most significant and crucial sections in the NEET exam is of Biology. It comprises of theories, descriptions, discoveries, diagrams, definitions, explanations of differences, and relations. The majority of the topics covered in the NEET syllabus are from the NCERT syllabus of Class 11 & 12 and other related sources become part of the rest of the syllabus. Clear Exam curates a list of articles selected by professionals who recommend the highly vital topics for NEET exams. The table below takes you directly to the respective topic where the in-depth article and the MCQs are available for an easy and productive learning experience. Prior to solving NEET question papers or practicing mock tests, you must ensure to study the basic concepts in NEET and practice a few sample questions related to this exam. Students will be covered for all their studies as the topics are available from basics to even the most advanced. .

Q1.   Arrange the events of menstrual cycle as they occur I. Secretion of FSH II. Growth of corpus luteum III. Growth of follicle and oogenesis IV. Ovulation V. Sudden increase in level of LH
  •  I, III, V, IV, II
  •  II, I, III, IV, V
  •  III, I, IV, V, II
  •  I, IV, III, V, II
Solution
(a)

Q2.   At the time of implantation, the human embryo is called
  •  Embryo
  •  Blastocyst
  •  Zygote
  •  Foetus
Solution
(b) The embryo with about 64 cells is termed as blastocyst. The process of attachment of blastocyst with the uterine wall of mother is called implantation. It occurs after 7 days of fertilization.

Q3.   Which one of the following is the correct matching of the events occurring during menstrual cycle?
  •  Ovulation – LH and FSH attain peak level and sharp fall in the secretion of progesterone
  •  Proliferative phase – Rapid regeneration of myometrium and maturation of Graafian follicle
  •  Development of corpus luteum – Secretory phase and increased secretion of progesterone
  •  Menstruation – Breakdown of myometrium and ovum not fertilized
Solution
(c) In secretory phase during ovulation, the follicle breaks and collapse under the continuous influence of Luteinizing Hormone (LH). It begins to enlarge and forms a yellowish structure, called the corpus luteum. The corpus luteum plays an important role in the preparation of the endometrium for the implantation of the fertilized egg by secreting estrogens and progesterone.

Q4.   Vasa efferentia are the ductules leading from
  •  Testicular lobules to rete testis
  •  rete testes to vas deferens
  •  Vas deferens to epididymis
  •  Epididymis to urethra
Solution
(b) Rete testis is connected to caput epididymis by 12-20 fine tubules called vasa efferentia or ductuli efference. These collect sperms from inside the testis and transfer them to the epididymis. Vas deferens arises from cauda epididymis, conducts, sperms from epididymis to urethra.

Q5.   The polar body of human ovum is formed
  •  Before birth
  •  After birth
  •  During birth
  •  Both (a) and (b)
Solution
(d) There are two types of polar bodies found in oogenesis in meiosis-I the first polar body is formed and in meiosis-II the 2nd type of polar body is formed. Meiosis-I takes place before birth and meiosis-II after birth of female

Q6.   Mixing up of chromosome of male and female nucleus is called
  •  Karyogamy
  •  Amphimixis
  •  Both (a) or (b)
  •  None of the above
Solution
(c) Karyogamy and amphimixis are the same terms. Mixing up of chromosomes of male and female nucleus is called karyogamy or amphimixis

Q7.   The epididymis leads to …A… that ascends to abdomen and loops over the …B…. Here A and B refers to
  •  A-epididymis; B-vas deferens
  •  A-vas deferens; B-epididymis
  •  A-vas deferens; B-urinary bladder
  •  A-urinary bladder; B-vas deferens
Solution
(c) A-vas deferens; B-urinary bladder

Q8.  



  •  Option A
  •  Option B
  •  Option C
  •  Option D
Solution
(c) Either (a) or (b). Blastocyst Formation At the next stage of development (morula), which produces an embryo with about 64 cells, a cavity is formed with in the cell mass. This cavity is called blastocyst cavity (blastocoel) and the embryo is termed as blastocyst. Blastocyst composed of an outer envelops of cells the trophoblast or trophoectoderm and inner mass cell (embryoblast). The side of the blastocyst to which inner mass cell is attached is called embryonic pole (animal pole), while opposite side is the abembryonic pole

Q9.   Our all bones are derived from the mesoderm. Except
  •  Facial
  •  Femur
  •  Redula
  •  Occipital
Solution
(a) All bones are derived from the mesoderm but only facial bones which are derived from the ectoderm

Q10.   Head region of the sperm contains
  •  Nucleus and acrosome
  •  Middle piece and neck region
  •   Nucleus and tail
  •  Middle piece and nucleus
Solution
(a) Nucleus and acrosome. Structure of a sperm (spermatozoa) It consists of four parts i.e., Head, Neck, Middle piece and tail, enveloped by a plasma membrane. Head It is the enlarged end of a sperm, containing the large haploid nucleus, i.e., condensed chromatin body and is capped by acrosome. The acrosome contains hydrolytic enzymes that help in dissolving membranes of the ovum for fertilization. Neck It contains proximal centriole which is necessary for the first cleavage division of zygote and the distal centriole that is connected to the tail filament. Middle piece It contains a number of mitochondria that provide energy for the movement of the tail that facilitate sperm motility essential or fertilization. Tail It consists of axial filaments surrounded by the plasma membrane. It helps the sperms to swim in a fluid medium


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