Tag: fertilization and post fertilization in humans

Questions Related to fertilization and post fertilization in humans

Which of the following statement is incorrect regarding the parturition?

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

  1. The signals of parturition originate from fully developed foetus and ovary

  2. Relaxin hormine relaxes the pubic symphysis during parturition

  3. Thyroxine is a main parturition hormone

  4. HCG is responsible for labour pain

Show answer
Correct Option: C
Explanation:

Parturition is the process of giving birth to the child.

A)its signal starts from the mature fetus.
B)Relaxin hormone relaxes the pubic symphysis during parturition by softening and lightening pubic symphysis.
C)Oxytocin is the main parturition hormone.
D)HCG is responsible for labor pain.
So the correct option is 'Thyroxine is the main parturition hormone'.

Foetal ejection reflex triggers the release of 

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

  1. Prolactin by maternal pituitary

  2. Prolactin by foetal pituitary

  3. Oxytocin by foetal pituitary

  4. Oxytocin by maternal pituitary

Show answer
Correct Option: D

The haemoglobin of a human foetus

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

  1. Has a higher affinity for oxygen than that of an adult

  2. Has a lower affinity for oxygen than that of the adult

  3. Its affinity for oxygen is the same as that of an adult

  4. Has only $2$ protein subunits instead of $4$

Show answer
Correct Option: A
Explanation:
  • The oxygen is needed for aerobic respiration and diffuses from a region of high to low concentration from the mother's blood to the blood of the foetus. 
  • The haemoglobin of the foetus has a higher affinity for oxygen than that of adult haemoglobin and so the efficiency of exchange is increased

So, the correct answer is 'Has a higher affinity for oxygen than that of an adult'

If a couple has four girls ,the probability of fifth child being male is _________.

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

  1. $50\%$

  2. $25\%$

  3. $75\%$

  4. $100\%$

Show answer
Correct Option: A
Explanation:

The gender of the consecutive children does not depend on each other. So, every time the couple has a kid, there is equal chances of them having a girl or a boy. Therefore, the probability would be 50% reasonably. 

In human beings, pregnancy lasts for $9$ months. The gestation period of dog, elephant, cat and cow is given. Which of the following is wrong match?

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

  1. Animal - Dog, Gestation period - $60-65$ days

  2. Animal- Elephant, Gestation period - $607-641$ days

  3. Animal - Cat, Gestation period - $52-65$ days

  4. Animal - Cow, Gestation period - $330-345$ days

Show answer
Correct Option: A
Explanation:

Gestation length varies by age of dam, breed, and sex of the calf. Gestation length ranges from 279 to 287 days. For most breeds, 283 days is common. In dogs, the entire gestation period is approximately nine weeks, or 63 days, although it can range from 58 to 68 days. Cat pregnancy normally lasts between 63 to 67 days, but it can be tough to know exactly how long a cat is pregnant for. The cat gestation period can vary from as short as 61 days to as long as 72 days. so, 'the correct option is-Animal - Cow, Gestation period - 330−345 days'

In which month, can the foetal movements be observed?

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

  1. $1^{st}$

  2. $5^{th}$

  3. $3^{rd}$

  4. $4^{th}$

Show answer
Correct Option: B
Explanation:
During the first pregnancy, it may not feel that the baby will move until closer to 25 weeks. By the second pregnancy, some women start to feel movements as early as 13 weeks. The first kicking activity is seen in the 5th month.
So, the correct option is '5th'. 

Find the correct statements.
a. By the end of $2^{nd}$ month of pregnancy, foetus limbs and digits develop
b. By the end of $1^{st}$ trimester, most of the major organs are formed in basic form.
c. Signal for parturition originates from fully developed foetus and placenta
d. Lactation starts after the end of pregnancy period

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

  1. a & c

  2. c & d

  3. b, c & d

  4. a, b, c & d

Show answer
Correct Option: D
Explanation:

It has been observed that by the end of the second month of pregnancy period, the foetus develops limbs and digits. Also, by the end of the first trimester (12 weeks), most of the major organs are developed, for instance, the limbs and external genital organs. The signals for parturition derives from the fully developed foetus and the placenta that further leads to mild uterine contraction referred to as foetal ejection reflex. By the end of pregnancy, the mammary glands initiate producing milk by the lactation process. 

So, the correct answer is option D, a, b, c & d. 

The process of releasing the ripe female gamete(ovum) from the ovary is called?

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

  1. Parturition

  2. Ovulation

  3. Fertilisation

  4. Implantion

Show answer
Correct Option: A

Milk ejection hormone in a lactating mother is?

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

  1. Prolactin

  2. Oxytocin

  3. Progesterone

  4. Estrogen

Show answer
Correct Option: A
Explanation:

Lactation is the method of synthesizing and secreting milk from the postpartum female breast mammary glands in reaction to a child sucking in the nipple. Mammary glands, which are enclosed in the breasts, produce the milk. The mammary gland consists of milk-carrying lactiferous ducts that grow and branch widely in reaction to estrogen, growth hormone, cortisol and prolactin during pregnancy.The prolactin of the pituitary hormone is extremely influential in establishing and maintaining the supply of breast milk. It is also essential for mobilizing breast milk maternal micro vitamins and minerals.

Foetal ejection reflex in human female is induced by?

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

  1. Differentiation of mammary gland

  2. Pressure exerted by amniotic fluid

  3. Release of oxytocin from pituitary

  4. Fully developed foetus and placenta

Show answer
Correct Option: D
Explanation:
  • When a woman is in a lithotomy or semi-sitting position, the Foetal Ejection Reflux is impaired and the increased pain caused by the sacrum’s inability to move as the baby descends can be intolerable
  • Foetal ejection reflex in human female is induced by fully developed foetus and placenta. so, option D is correct