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Reproduction system And Embryology Quiz-19

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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. What happens during the follicular phase of menstrual cycle?
  •  Proliferation of endometrium wall
  •  Reduction of endometrium wall
  •  Shadding of endometrium wall
  •  No effect on endometrium wall
Solution
Proliferation of endometrium. In the ovulatory phase, both LH and FSH attain a peak level in middle of cycle (about 14 day). Rapid secretion of LH induces rupturing of Graafian follicle and thereby releasing the ovum in human beings (secondary oocyte is released). This is called ovulation. Infact increase level of LH causes ovulation

Q2. Give the name A,B and C in the previous question
  •  A-Secondary spermatocytes, B-Primary spermatocytes, C-Spermatozoa
  •  A- Spermatozoa, B-spermatocytes, C- Primary spermatocytes, Secondary spermatocytes
  •  A- Primary spermatocytes, B- Secondary spermatocytes, C-Spermatozoa
  •  A- Spermatozoa, B-Secondary spermatocytes, C- Primary spermatocytes
Solution
A – Primary spermatocytes B – Secondary spermatocytes C – Spermatozoa

Q3. Embryo at 8 to 16 cell stage is called
  •  Blastula
  •  Morula
  •  Trophoblast
  •  All of these
Solution
Embryo at 8 to 16 stages is called morula stage of embryo 


Q4. Which part of the sperm is motile?
  •  Head
  •  Neck
  •  Middle
  •  Tail
Solution
Sperm has mitochondria at its middle part. This middle part gives energy for the motility to the sperm. 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

Q5.Which hormone is produced throughout the menstrual cycle?
  •  FSH
  •  Oestrogen
  •  LH
  •  Progesterone
Solution
  Oestrogen concentration remains almost constant and produce throughout the menstrual cycle Generally, menstrual cycle have four phases (i) Menstrual phase (a) The soft tissue of endometrial lining of the uterus disintegrates causing bleeding. (b) The unfertilized egg and soft tissue are discharged. (c) It lasts 3-5 days. (ii) Follicular Phase/Proliferative Phase (a) The primary follicles in the ovary grow and become a fully mature Graafian follicle. (b) The endometrium of the uterus is regenerated due to the secretion of LH and FSH from anterior pituitary and ovarian hormone, estrogen. (c) It least for about 10-14 days. (iii) Ovulatory Phase (a) Rapid secretion of LH (LH surge) induces rupture of Graafian follicle, thereby leading to ovulation (release of ovum). (b) It lasts for only about 48 hr. (iv) Luteal Phase/Secretor Phase (a) In this phase the ruptured follicle changes into corpus luteum in the ovary and it begins to secrete the hormone progesterone. (b) The endometrium thickens further and their glands secrete a fluid into the uterus. c) If ovum is not fertilized, the corpus luteum undergoes degeneration and this causes disintegration of the endometrium leading to menstruation. (d) Oestrogen and progesterone levels rise during this phase. It lasts for only 1 day. (e) During pregnancy all events of the menstrual cycle stop and there is no menstruation. The menstrual cycle permanently stops in females at the age of around 50 years. This is called menopause

Q6. Which of the following statement is correct?
  •  hCG,hPL and relaxin are produced women only during pregnancy
  •  During pregnancy the level of other hormones like oestrogens, progestogens, cortisol, prolactin, thyroxine, etc., are increased several folds in the maternal blood
  • Increased production of hcG, hPL, progesterone, etc., is essential for supporting the foetal growth, metabolic changes in the mother and maintenance of pregnancy
  •  All of the above
Solution
hCG,hpG, and relaxin are produced during pregnancy. During pregnancy the level of other hormone like oestrogen, progesterone, cortisol, prolactin, thyroxin, etc., are increased several folds in maternal blood. Increased production of these hormones is essential for supporting the foetal growth, metabolic changes in the mother and maintenance of pregnancy 



Q7.Primary sex organ in man is
  •  Scrotum
  •  Accessory gland
  •  Testis
  •  Urinary bladder
Solution
  





Q8.FSH is given to a rat which don’t have anterior lobe of pituitary. What will not happen in rat?
  •  Proliferation of endometrium
  •  TDevelopment of corpus luteum
  •  Maturation of Graafian follicle
  •  Build-up of oestrogen in blood stream
Solution
Development of corpus luteum is done by progesterone and LH not by FSH. Progesterone and LH are secreted by anterior lobe of pituitary

Q9.Body covered with fine hair, eyelid separates and eye lashes are formed during ….. of development
  •  3rd month
  •  4th month
  •  5th month
  •  6th month
Solution
 


















Q10. Which of the following is correct?
  •  Mesoderm – Brain
  •  Ectoderm –Liver
  •  Mesoderm – Skeleton
  • Endodermis -Epidermis
Solution
Notochord, circulatory system, organs of urogenital system (including ureter, kidney, gonads, reproductive ductes); skeletal muscle, bone, cartilage of skeleton (except skull), dermis, connective tissues, etc are the derivatives of mesoderm.

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