Tag: zoology

Quizzes (289) Questions (5869)

Questions Related to zoology

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

The function of oxytocin is to help in

  1. child birth

  2. growth

  3. lactation

  4. gametogenesis
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.

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

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

  1. Lactation

  2. Uterine contractions

  3. Oxytocin secretion

  4. Dilation of uterus
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.

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

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

  1. hCG

  2. hPL

  3. Oxytocin

  4. Progesterone
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Oxytocin is the hormone that stimulates powerful uterine contractions, and its concentration increases significantly to determine the onset and progression of labor (childbirth).

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

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

  1. Utrus

  2. Zygote

  3. Foetus

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Birth occurs when foetal development is complete, typically around 38-40 weeks of gestation. The zygote is the initial single-cell stage formed at fertilization, not the developed stage ready for birth. The uterus is the organ, not the developing organism. At birth, the foetus has developed all major organ systems and is ready to survive outside the womb. Thus, completion of foetal development is the prerequisite for birth.

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

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

  1. Gestation

  2. Implantation

  3. Parturition

  4. Capacitation
Reveal answer Fill a bubble to check yourself
C Correct answer
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. 

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

Gestation period of Salamandra atra is 

  1. 200 days

  2. 540 days

  3. 36 months

  4. 440 days
Reveal answer Fill a bubble to check yourself
C Correct answer
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'.

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

Which grouping has gestation period in decreasing order?

  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
Reveal answer Fill a bubble to check yourself
B Correct answer
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'

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

Oxytocin is helpful in

  1. Semen formation

  2. Parturition

  3. Diuresis

  4. Molecular development
Reveal answer Fill a bubble to check yourself
B Correct answer
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'.

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

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

  1. Amniotic fluid passing out

  2. Expulsion of baby

  3. Expulsion of placenta, umbilical cord and foetal membrane

  4. Secretion of hormone relaxin
Reveal answer Fill a bubble to check yourself
C Correct answer
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'.

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

Foetal ejection reflex in human female induces

  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
Reveal answer Fill a bubble to check yourself
C Correct answer
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'.