Tag: zoology

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Questions Related to zoology

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

Gestation period in human beings is about 

  1. 10 weeks

  2. 28 weeks

  3. 32 weeks

  4. 36 weeks
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Gestation (pregnancy) is completed in about 266 days from the mother's last menstruation. The gestation period of human beings is 270 days to 280 (approximately). It is usually about 266 days i.e., 36 weeks.

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

The process of delivery of the feotus is called 

  1. Parturition

  2. Implantation

  3. Fertilisation

  4. Lactation

  5. Ovulation
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Parturition can be defined as the act of expelling the full term young ones from the mother's uterus at the end of the gestation period. In other words, the process of delivery of the fetus is known as parturition.

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

Delivery of developed foetus is

  1. Ovulation

  2. Oviposition

  3. Parturition

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

The delivery of the developed foetus after 9 months is known as parturition. Ovulation is the release of the secondary oocyte from the ovary. 

Oviposition is known as the egg-laying stage.
Abortion is the ending of the pregnancy before time. If it is abrupt then it is known as a miscarriage but if the abortion is surgical and through pills, it is known as induced abortion.
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

Thick yellow, high protein fluid produced by mammary glands of a woman during first $2-3$ days after child birth is

  1. Meconium

  2. Hymen

  3. Cumulus oophorus

  4. Colostrum
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
The mammary glands undergo differentiation during pregnancy and start producing milk towards the end of pregnancy by the process called lactation.
The milk produced during the initial few days of lactation – colostrum. It is thick and yellow in colour. It contains several antibodies essential to develop resistance for new-borns.
so, the correct option is 'Colostrum'.
Multiple choice zoology menustral cycle in human parturition and lactation pregnancy and birth fertilization and post fertilization in humans

State whether the following statements are true or false.
Prolactin stimulates milk secretion and growth of breast.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Prolactin regulates the growth of the mammary glands and formation of milk in them. Prolactin has a wide variety of effects. It stimulates the mammary glands to produce milk (lactation). Increased serum concentrations of prolactin during pregnancy cause enlargement of the mammary glands and prepare for milk production.
So, the correct option is 'True'.
Multiple choice zoology menustral cycle in human parturition and lactation pregnancy and birth fertilization and post fertilization in humans

Breast feeding suspends pregnancy due to

  1. Post pregnancy lower levels of FSH and LH

  2. Post pregnancy higher levels of FSH and LH which puts a negative check on ovulation

  3. Inhibiting the release of FSH by prolactin and thus countering the effects of FSH on the ovarian follicles

  4. Increasing the release of inhibin by prolactin and thus countering the effects of FSH on the ovarian follicles
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The hypothalamus secretes the Gonadotropin-releasing hormone which is responsible for menstruation sequence. The GnrRH repressed by the prolactin hormone, which encourages the production of milk. Without the GnRH release, the menstrual cycle wont begin a new event of pregnancy.

As long as prolactin level are high, GnRH generally won't be release. Now GnRH is responsible for the release of the follicular stimulating hormone. The hormone FSH is responsible for the formation of ovarian follicle. So, as GnRH is stopped there will be an inhibition in the release of FSH by prolactin and thus thus it counter the effects of FSH on the ovarian follicle. So, there will be a delay in ovulation that will automatically prevent pregnancy. 
So, the correct option is 'Inhibiting the release of FSH by prolactin and thus countering the effects of FSH on the ovarian follicle'.

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

Which of these is not an important component of the initiation of parturition in humans?

  1. Synthesis of prostaglandins

  2. Release of oxytocin

  3. Release of prolactin

  4. Increase in estrogen and progesterone ratio
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

  • Parturition is a phenomenon of giving birth. It is a process of delivering a child from the womb to the outside. It is usually initiated by the release of oxytocin hormone. 
  • This hormone increases the contraction of uterine muscles. Prostaglandins are synthesized and released in response to the oxytocin hormone. Also, an increase in estrogen and progesterone ratio indicates the initiation of the parturition process. 
  • Prolactin hormones are released after the parturition in order to secrete the milk from the mammary gland.

Thus, the correct answer is 'Release of prolactin.'

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

Which of the following statement is incorrect regarding the parturition?

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

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

Foetal ejection reflex triggers the release of 

  1. Prolactin by maternal pituitary

  2. Prolactin by foetal pituitary

  3. Oxytocin by foetal pituitary

  4. Oxytocin by maternal pituitary
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The foetal ejection reflex is triggered by the fully developed foetus and placenta, which sends signals to the maternal pituitary gland to release oxytocin. Oxytocin then causes the uterine contractions necessary for childbirth.

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

The haemoglobin of a human foetus

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