Tag: zoology

Questions Related to zoology

The function of oxytocin is to help in

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

  1. child birth

  2. growth

  3. lactation

  4. gametogenesis

Show answer
Correct Option: A
Explanation:

Oxytocin i a hormone released by the posterior pituitary that helps the muscles of the uterus to contract during parturition (child birth). It also stimulates the release of prostaglandins that help cause further contraction. So, the correct option is 'child birth'.

Estrogen progesterone ratio increases during end of the 3rd trimester. This is responsible for increasing

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

  1. Lactation

  2. Uterine contractions

  3. Oxytocin secretion

  4. Dilation of uterus

Show answer
Correct Option: A
Explanation:

  • The increased levels of oxytocin at the time of parturition are responsible for vigorous uterine contractions and the dilation of the uterus. 
  • The estrogen-progesterone ratio increases during the end of the 3rd trimester which results in the increased ability of the mammary glands for lactation.

So, the correct answer is 'lactation'.

Increase in concentration of which hormone determines the time of child birth?

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

  1. hCG

  2. hPL

  3. Oxytocin

  4. Progesterone

Show answer
Correct Option: C

The mother gives birth to the child when the development of the _____ is complete.

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

  1. Utrus

  2. Zygote

  3. Foetus

  4. None of these

Show answer
Correct Option: C

The act of expelling the full term foetus from the uterus is termed as

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

  1. Gestation

  2. Implantation

  3. Parturition

  4. Capacitation

Show answer
Correct Option: C
Explanation:

The process of delivery of foetus is called as parturition. Parturition is the act of expelling the full-term foetus from the mother's uterus at the end of gestation. In this process fully developed foetus produces foetal ejection reflex which stimulates pituitary to release oxytocin hormone. This hormone causes vigorous uterine contraction that leads to the delivery of feotus. This process is also known as the delivery of the foetus when the pregnancy period gets over. The importance of parturition is that the event results in the foetus to come out of the womb. The process is accompanied with the onset of lactation.

Thus, the correct answer is option C. 

Gestation period of Salamandra atra is 

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

  1. 200 days

  2. 540 days

  3. 36 months

  4. 440 days

Show answer
Correct Option: C
Explanation:

Salmonella atra is an amphibian having one of the longest gestation periods among animals existing on this earth. They have a gestation period between 36-48 weeks.

They are unique in the sense that it has an ovo-viviparous method of reproduction by which it gives birth on land to fully metamorphosed offspring causing such a long gestation period.
So, the correct option is '36 months'.

Which grouping has gestation period in decreasing order?

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

  1. Cow, Horse, Goat, Monkey and Swine/ Pig

  2. Horse, Cow, Goat, Monkey and Swine

  3. Money, Cow, Horse, Goat and Swine

  4. Monkey, Horse, Goat, Cow and Swine

Show answer
Correct Option: B
Explanation:

The horse has a gestation period of around 342 days whereas it is around 289 days for the cow.

Goat has a gestation period of 165 days and for Monkey, it is 155 to 160 days. Pig has the least gestation period of around 116 days.
So, the correct option is  'Horse, Cow, Goat, Monkey, and Swine'

Oxytocin is helpful in

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

  1. Semen formation

  2. Parturition

  3. Diuresis

  4. Molecular development

Show answer
Correct Option: B
Explanation:

Oxytocin is a hormone which is released from the pituitary gland. It is responsible for the muscular contraction which occurs during the parturition. The fully developed baby exerts a pressure on the walls of the uterus and as a result, it signals the pituitary gland to release oxytocin. The muscular contractions are responsible for the expulsion of the baby out of the uterus.

So, the correct option is 'Parturition'.

Which of the following relates to the term "after-birth"?

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

  1. Amniotic fluid passing out

  2. Expulsion of baby

  3. Expulsion of placenta, umbilical cord and foetal membrane

  4. Secretion of hormone relaxin

Show answer
Correct Option: C
Explanation:

Parturition or childbirth is the event of bringing a child into the world from the uterus of the mother. It involves forceful muscle contractions of the uterine wall which push the child out of the womb through the vaginal canal. Several events take place after the birth of the child, including expulsion of the placenta, umbilical cord, and fetal membrane.

So, the correct answer is 'Expulsion of the placenta, umbilical cord, and fetal membrane'.

Foetal ejection reflex in human female induces

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

  1. Release of hormones from placenta

  2. Growth and development of ovarian follicles

  3. Release of oxytocin from maternal pituitary

  4. Release of gonadotrophins

  5. Release of prolactin from pituitary

Show answer
Correct Option: C
Explanation:

Foetal ejection reflex occurs at the time of parturition and are gentle uterine contactions produced by the placenta. This may occur due to extremely high levels of adrenaline during childbirth. Since parturition is a neuro-endocrine process, oxytocin is released by the neurohypophysis of maternal pituitary which stimulates stronger contractions of the uterus and induces labour pain, with decreasing progesterone levels and marks the end of the gestation period. Hence, the correct answer is 'Release of oxytocin from maternal pituitary'.