Tag: fertilization and post fertilization in humans

Questions Related to fertilization and post fertilization in humans

Which of the following structures serves as a lung, digestive tract, and kidney for the developing embryo?

zoology reproduction in humans placenta pregnancy and birth fertilization and post fertilization in humans

  1. Placenta

  2. Endometrium

  3. Amnion

  4. Liver

Show answer
Correct Option: A
Explanation:

The placenta is an organ that develops in the uterus during pregnancy. This structure provides oxygen and nutrients to the growing baby and removes waste products from the baby's blood. The placenta attaches to the wall of the uterus, and the baby's umbilical cord arises from it. The organ is usually attached to the top, side, front or back of the uterus.

So the correct option is 'placenta'.

State whether the following statements are true or false .
Endometrium is highly vascular and rich in glands.

zoology reproduction in humans placenta pregnancy and birth fertilization and post fertilization in humans

  1. True

  2. False

Show answer
Correct Option: A
Explanation:
In the uterus, simple tubular glands reach from the endometrial surface through to the base of the stroma, which also carries a rich blood supply provided by the spiral arteries
So, the correct answer is 'True'

Choose the correct answers from the alternatives given.
The placenta

zoology reproduction in humans placenta pregnancy and birth fertilization and post fertilization in humans

  1. is formed by the inner portion of the chorion

  2. contacts a portion of the mothers endometrium

  3. allows the fetus and the mother to exchange nutrients and waste products

  4. all of the above

Show answer
Correct Option: D
Explanation:

The placenta facilitates the supply of oxygen and nutrients to the embryo and also the removal of carbon dioxide and excretory/waste materials produced by the embryo. It is formed from the chorion. 

So the correct option is 'All of the above'.

State whether the following statements are true or false .
The placenta in humans is the true placenta in which foetal and maternal parts can be easily separated without any bleeding.

zoology reproduction in humans placenta pregnancy and birth fertilization and post fertilization in humans

  1. True

  2. False

Show answer
Correct Option: B
Explanation:
The placenta is delivered as part of the afterbirth with a small gush of blood, from a few minutes to a half hour after the baby arrives. The doctor or midwife will examine it to make sure it's intact and that nothing has been left behind in the uterus
So, the correct answer is 'False'

On the basis of intimacy Human placenta is 

zoology reproduction in humans placenta pregnancy and birth fertilization and post fertilization in humans

  1. Interstitial placenta

  2. Deciduate placenta

  3. Discoidal placenta

  4. Yolk sac placenta

Show answer
Correct Option: A

Milk secreted from the cells of alveoli of mammary lobes reaches nipple through lactiferous duct (L), mammary duct(M), mammary tubule (T) and mammary ampulla (A) in the following order

zoology menustral cycle in human parturition and lactation pregnancy and birth fertilization and post fertilization in humans

  1. TMAL

  2. MTLA

  3. MTAL

  4. ATML

Show answer
Correct Option: A
Explanation:
  • Mammary glands or breasts are modified sweat glands that lie over the pectoral muscles. Each breast has a broad multiporous tip called nipple for the release of milk. A circular pigmented area called areola lies below it. Each breast contains 15-20 glandular lobes separated from one another by dense connective tissue and adipose tissue. Each lobe is further made of many lobules having glandular or secretory alveoli.
  • The cells of alveoli produce milk which is stored in the cavities or lumens of alveoli. Alveoli open into mammary tubules and then into mammary ducts. Mammary ducts form a mammary ampulla from which a lactiferous duct develops. Each lobe produces a separate lactiferous duct. The various lactiferous ducts open at the nipple by separate pores.
So, the correct answer is 'TMAL'.

Delivery of developed fetus is scientifically called ______________.

zoology menustral cycle in human parturition and lactation pregnancy and birth fertilization and post fertilization in humans

  1. Parturition

  2. Oviposition

  3. Abortion

  4. Ovulation

Show answer
Correct Option: A
Explanation:

Parturition is the act of expelling the full-term young one from the mother's uterus at the end of gestation. Gestation (pregnancy) is completed in about 266 days from the mother's last menstruation.

Given below are three statements each with one or two blanks. Select the option which correctly fills up the blanks in, any two statements.
(A) In human beings, menstrual cycle ceases around 50 years of age; this is termed as  (i) .
(B) The milk produced during the initial few days of lactation is called  (i)  which contains several  (ii)  absolutely essential to develop resistance for the new-born babies.
(C) At the completion of the  (i)  division the primary oocyte divides into secondary oocyte and  (ii) .

zoology menustral cycle in human parturition and lactation pregnancy and birth fertilization and post fertilization in humans

  1. (A)-(i) menarche; (B)-(i) lactation, (ii) minerals

  2. (B)-(i) colostrum, (ii) antibodies, (C)-(i) first meiotic, (ii) first polar body

  3. (A)-(i) menopause; (C)-(i) second meiotic, (ii) second polar body

  4. (A)-(i) menopause; (B)-(i) corpus luteum, (ii) antibodies

Show answer
Correct Option: B
Explanation:

The mammary glands of the female undergo differentiation after the pregnancy and starts producing milk towards the end of it, called lactation and the milk produced during these initial few days is referred to as colostrum. This contains many antibodies that is essential for the new born babies to develop resistance against any pathogen attack or disease. During oogenesis the gamete mother cell undergoes meiosis division to form the primary oocyte and this further divides into the secondary oocyte and a polar body by means of an unequal division. 

So, the correct option is ' (B)-(i) colostrum, (ii) antibodies, (C)-(i) first meiotic, (ii) first polar body'.

Intensely lactating mothers do not generally conceive due to the

zoology menustral cycle in human parturition and lactation pregnancy and birth fertilization and post fertilization in humans

  1. Suppression of gonadotropins

  2. Hypersecretion of gonadotropins

  3. Suppression of gametic transport

  4. Suppression of fertilization

Show answer
Correct Option: A
Explanation:
Presence of prolactin hormone in the blood of lactating mothers suppresses the release of gonadotropins (FSH and LH) from the pituitary gland. Gonadotropins are required for ovulation to occur. Thus, in the absence of gonadotropins, ovum is not released and hence chances of fertilisation are nil upto 6 months following parturition (if the mother is regularly breast-feeding). Therefore, intensely lactating mothers do not generally conceive.
So, the correct answer is 'Suppression of gonadotropins'.

Which hormone stimulates the secretion of milk from female?

zoology menustral cycle in human parturition and lactation pregnancy and birth fertilization and post fertilization in humans

  1. Oxytocin

  2. Progesterone

  3. LH

  4. Prolactin

Show answer
Correct Option: D
Explanation:

 Prolactin hormone is secreted by pituitary gland it stimulates the secretion of milk from mammals. It rises only when a baby suckles. Hormone oxytocin cause tiny muscles around the alveoli to squeeze the milk by using small tubes called milk ducts. Oxytocin is also responsible for contraction of uterus muscles, during and after birth. Prolactiiin and Oxytocin help the mother to form an emotional bond with her baby. Progesterone regulates the growth in size of alveoli and lobes. Estrogen stimulates the milk duct system to grow. Follicle stimulating hormone, luteinizing hormone and human chorionic gonadotropin control the level of estrogen and progesterone production.