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

Match the columns and find the correct options.

Column I Column II
a Parturition p Attachment of zygote to endometrium
b Gestation q Release of egg from Graafian follicle
c Ovulation r Delivery of baby from uterus
d Implantation s Duration between pregnancy and birth
e Conception t Formation of zygote by fusion of egg and sperm
u Stoppage of ovulation and menstruation

  1. a-q, b-s, c-p, d-t, e-r

  2. a-s, b-r, c-p, d-t, e-q

  3. a-t, b-p, c-q, d-r, e-s

  4. a-r, b-s, c-q, d-p, e-t
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Parturition is also called as childbirth. It is the act of delivering baby from uterus. Gestation is a period of developing embryo from conception to birth. It is a duration considered between pregnancy and birth. Ovulation is a process of releasing of egg from the ovary or Graafian follicle. Implantation is the process in which fertilized egg or zygote adheres or attaches to the endometrium wall of the uterus. Conception is the act of conceiving  a baby. In this, zygote is formed from the fusion of egg and sperm.

Thus, the correct answer is 'a-r, b-s, c-q, d-p, e-t.'

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

Which is called milk ejection hormone?

  1. Prolactin

  2. Oxytocin

  3. Vassopressin

  4. Luteinizing hormone
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The release of the hormone oxytocin from maternal pituitary which leads to the milk ejection.  Oxytocin stimulates the muscle contraction surrounding the breast to squeeze out the milk. 

so, the correct option is 'Oxytocin'.

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

Signals for parturition originate from

  1. Fully developed foetus only

  2. Placenta only

  3. Oxytocin released by maternal pituitary

  4. Both A and B
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Parturition is an induced Complex neuroendocrine mechanism. In this signals are originated from a fully developed fetus and placenta. This lead to mild uterine contractions and hence fetal ejection reflex. Then oxytocin is released from maternal pituitary and it acts on uterine muscles leading to strong uterine contractions. This further continues to stronger and stronger contractions. As a result, the baby is expelled out of the uterus with placenta through the birth canal. 

so, the correct option is 'Both A and B'.

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 correct?

  1. Foetal heart is formed in second month

  2. Foetus shows movements for the first time in seventh month

  3. hPL has a major role in parturition

  4. Signal for parturition comes from fully developed foetus and placenta
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Parturition is an induced Complex neuroendocrine mechanism. In this signals are originated from a fully developed fetus and placenta. This lead to mild uterine contractions and hence fetal ejection reflex. Then oxytocin acts on uterine muscles leading to strong uterine contractions. This further continues to stronger and stronger contractions. As a result, the baby is expelled out of the uterus with placenta through the birth canal. 

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

Which of the following hormones initiate parturition?

  1. ACTH, hCG, oxytocin

  2. ACTH, corticosteroid, oxytocin

  3. Corticosteroid, ACTH, prostaglandin

  4. ACTH, progesterone, hCG
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Parturition is the process in which a mother gives birth to its young one. It initiates when the message initiating parturition starts with the fetal brain, its control of ACTH release from the pituitary, and increased cortisol production by the fetal adrenal. The cortisol stimulates placental enzymes which cause placental progesterone to be made into estrogen. Oxytocin leads to the contraction of smooth muscles of myometrium of the uterus, which directs the full term foetus towards the birth canal.

So the correct option is 'ACTH, corticosteroid, oxytocin'.

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

Forceful muscular contractions of uterine wall are involved in

  1. Implantation

  2. Lactation

  3. Micturition

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

Parturition or childbirth is the event of bringing a child into the world from the uterus of the mother. It is the apotheosis of pregnancy. It involves forceful muscle contractions of the uterine wall which push the child out of the womb through the vaginal canal.

So, the correct answer is 'Parturition'.

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

The signals for parturition originate from

  1. Placenta only

  2. Placenta as well as fully developed foetus

  3. Oxytocin released from maternal pituitary

  4. Fully developed foetus only
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Parturition is the process of giving birth or delivery. The signals for parturition originate from the placenta as well as fully developed foetus. Both these induces uterine contractions. These uterine contractions are called as foetal ejection reflex. This then stimulates the release of oxytocin hormone from the maternal pituitary gland. 

Thus, the correct answer is 'Placenta as well as fully developed foetus.'

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

An animal with gestation period of more than one year is

  1. Cow

  2. Dog

  3. Camel

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

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

Short term immunity is provided by 

  1. Lysozyme

  2. Serum

  3. Vaccine

  4. Colostrum
Reveal answer Fill a bubble to check yourself
D Correct answer
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'.

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

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

  1. Harelip

  2. Extra fingers and toes

  3. Undeveloped limbs

  4. No spleen
Reveal answer Fill a bubble to check yourself
C Correct answer
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'.