Tag: fertilization and post fertilization in humans

Questions Related to fertilization and post fertilization in humans

An animal with gestation period of more than one year is

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

  1. Cow

  2. Dog

  3. Camel

  4. Rat

Show answer
Correct Option: A
Explanation:

  • Gestation length of a cow ranges from 279-287 days and is usually 283 days. 
  • The gestation period of a dog usually ranges from 58-68 days. 
  • The camel has a gestation period of 13-14 months or 410 days approximately. 
  • The gestation period of a rat varies from 21-23 days (rarely 26 days). 
Hence the correct answer is 'Camel'.

Short term immunity is provided by 

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

  1. Lysozyme

  2. Serum

  3. Vaccine

  4. Colostrum

Show answer
Correct Option: D
Explanation:

Colostrum is the name given to the first milk produced by the mammary glands of mammals. It consists of various antibodies that provide natural passive immunity to the newborns. This immunity is transient and does not have a latent period or a negative phase.

So, the correct answer is 'Colostrum'.

Women who consumed thalidomide as antivomiting drug during early months of pregnancy gave birth to children with

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

  1. Harelip

  2. Extra fingers and toes

  3. Undeveloped limbs

  4. No spleen

Show answer
Correct Option: C
Explanation:
Thalidomide is a teratogen. It is prescribed to pregnant woman to get relief from nausea during pregnancy. Teratogens are the drugs which can cause foetal abnormalities if given to a pregnant woman. These drugs can cross the placenta as it does not acts as a barrier. Thalidomide is a synthetic teratogen which causes phocomelia, a condition of undeveloped limbs (or seal like limbs) in new born babies. Sometimes, the fingers are also fused.
So, the correct answer is 'Undeveloped limbs'.

Fetal 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 glands

  2. Pressure exerted by amniotic fluid

  3. Release of oxytocin from pituitary

  4. Fully developed fetus and placenta

Show answer
Correct Option: D
Explanation:

Foetal ejection reflex in human female is induced by fully developed foetus and placeta which causes mild contraction. This induces the release of oxytocin from maternal posterior pituitary ultimately leading to parturation due to strong contractions.

So, the correct option is 'fully developed foetus and placenta'.

At the time of child birth, which harmone is secreted?

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

  1. Glucocorticoid

  2. Progesterone

  3. Relaxin

  4. Thyroxine

Show answer
Correct Option: A

If both ovaries are removed from  a pregnant human female in first trimester of pregnancy then it will lead to : (Explain) the answer also)

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

  1. Absorption

  2. Normal development

  3. Irregular ovulation no fixed time interval

  4. Menarche

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Correct Option: A

Which foetal hormone signals that it is mature now to take birth?

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

  1. Relaxin

  2. Oxytocin

  3. ACTH

  4. Progesterone

Show answer
Correct Option: A
Explanation:

  • Relaxin is a hormone secreted by the placenta that causes the cervix to dilate and prepares the uterus for the action of oxytocin during labour.
  • Relaxin is a protein hormone of about 6000 Da.
  • Relaxin is produced by the ovary and the placenta.
So, the correct answer is 'Relaxin'

The normal gestation period in humans is 

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

  1. 270 days

  2. 290 days

  3. 280 days

  4. 295 days

Show answer
Correct Option: C
Explanation:
Gestation period is the time period of foetal development from the day of conception until birth. The normal gestation period in humans is about 40 weeks or 280 days. This time period is calculated after the onset of woman's last period.
So, the correct answer is '280 days'.

Choose the correct answers from the alternatives given.
The period of time from conception of the zygote to delivery of the fetus is called

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

  1. implantation

  2. gastrulation

  3. fertilization

  4. gestation

Show answer
Correct Option: D
Explanation:
 Gestation in mammals is the time between conception and birth, during which the embryo or fetus is developing in the uterus. The gestation period in humans is about 40 weeks.
So the correct option is 'gestation'.

Colostrum (mother's milk produced immediately after child birth) is beneficial for immunity of the human infant because it contains

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

  1. $IgF$

  2. $IgC$

  3. $IgB$

  4. $IgA$

Show answer
Correct Option: D
Explanation:

Colostrum is the form of milk produced by the mother, after the birth of the baby. This is the first milk and is known to contain nutrients, proteins, antibodies and many growth factors essential for the growth and development of immunity in the baby. This milk contains high amounts of IgA. This antibody is required to protect the mucous membranes present in the throat, lungs and intestine of the baby from infection. 

Thus, the correct answer is option D.