Tag: zoology

Questions Related to zoology

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

Show answer
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. 

At the time of birth, a baby girl has thousands of immature eggs.

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

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

  • Unlike spermatogenesis, oogenesis starts in embryonic life with the formation of oogania ( gamete mother cells ).
  • Oogania starts dividing and enter into a prophase-I stage of the meiosis. They get arrested at this stage and they are called as primary oocytes now. 
  • These oocytes are basically immature eggs and they are present in thousands within each ovary of a baby.
So, the correct option is 'True'.

Mother's milk is preferred to cow's milk because it contains

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

  1. More fats and more lipids

  2. Less lopids and more fats

  3. More lipids and less fats

  4. Less fats and less lipids

Show answer
Correct Option: D
Explanation:

Whole cow's milk also contains too much protein, sodium, potassium, phosphorus and chloride which may put a strain on an infant's immature kidneys. In addition, the proteins, fats and calcium in whole cow's milk are more difficult for an infant to digest and absorb than the ones in breast milk. So, the correct option is "D" (Less fats and less lipids).

Column I contains terms and Column II contains definitions. Match them correctly and choose the right answer.

Column I Column II
A Parturition 1. Attachment of zygote to endometrium
B. Gestation 2. Release of egg from Graafian follicle
C. Ovulation 3. Delivery of baby from uterus
D. Implantation 4. Duration between pregnancy and birth
E. Conception 5. Formation of zygote by fusion of the egg and sperm
6. Stoppage of ovulation and menstruation
zoology menustral cycle in human parturition and lactation pregnancy and birth fertilization and post fertilization in humans

  1. A - 2, B - 4, C - 1, D - 5, E - 3

  2. A - 4, B - 3, C - 1, D - 5, E - 2

  3. A - 5, B - 1, C - 2, D - 3, E - 4

  4. A - 3, B - 4, C - 2, D - 1, E - 5

Show answer
Correct Option: D
Explanation:

The duration of pregnancy from conception till birth is known as gestation. It occurs for a duration of 40 weeks. The release of eggs from the ovaries (or the mature graafian follicle) is known as ovulation. Implantation is the process in which the embryo in the blastocyst stage is implanted in the uterus. When the egg fuss with the sperm resulting in the formation of zygote it is known as conception. Parturition is the act of childbirth in which the baby is delivered from the uterus. So, the correct option is 'A - 3, B - 4, C - 2, D - 1, E - 5'.