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Select the correct sequence for transport of sperm cells in male reproductive system.

 

  • Option 1)

    Testis \rightarrow Epididymis \rightarrow Vasa efferentis \rightarrow Rete testis \rightarrow Inguinal canal \rightarrow Urethra

  • Option 2)

    Seminiferous tubules \rightarrow Rete testis \rightarrow Vasa efferentia \rightarrow Epididymis\rightarrow Vas deferens \rightarrow Ejaculatory duct \rightarrow Urethra \rightarrow Urethral meatus

  • Option 3)

    Seminiferous tubules \rightarrow Vasa efferentia \rightarrow Epididymis \rightarrow Inguinal canal \rightarrow Urethra

  • Option 4)

    Testis \rightarrow Epididymis \rightarrow Vasa efferentia \rightarrow Vasa deferens \rightarrow Ejaculatory duct \rightarrow Inguinal canal \rightarrow Urethra \rightarrow Urethral meatus

  Testis - In adults, each testis is oval in shape, with a length of about 4 to 5 cm and a width of about 2 to 3 cm. The testis is covered by a dense covering. -       The pathway for the transport of sperms: Seminiferous tubules Rete testis Vasa efferentia Epididymis Vas deferens Ejaculatory duct Urethra Uretral meatus                                                                Option...

Select the hormone-releasing Intra-uterine Devices.

  • Option 1)

    Vaults,LNG-20

  • Option 2)

    Multiload\: 375,Progestasert

  • Option 3)

    Progestasert,LNG-20

  • Option 4)

    Lippes\: Loop,Multiload\: 375

    contraceptive - Contraceptive are methods which help prevent unwanted pregnancies. - wherein An ideal contraceptive should be userfriendly, easily available, effective and reversible with no or least sideeffects. It also should in no way interfere with the sexual drive, desire and/or the sexual act of the user.     The IUD's or Intra-Uterine Devices can act either through phagocytosis of...

What is the fate of the male gametes discharged in the synergid?

 

  • Option 1)

    One fuses with with the egg other(s) degentrate in the synergid

  • Option 2)

    All fuse with the egg

  • Option 3)

    One fuses with the egg, other(s) fuse with the synergid nucleus.

  • Option 4)

    One fuses with with the egg and other fuses with central cell nuclei

 
  Double Fertilisation - After entering one of the synergids, the  pollen tube releases the two male gametes into the cytoplasm of the synergid. One of the male gametes moves towards the egg cell and fuses with its nucleus thus completing the syngamy. This results in the formation of a diploid cell, the zygote. -       Out of the two male gamete that are discharged in the synergid cell via...

Which of the following contracepative methods do involve a role of hormone?

 

 

  • Option 1)

    Lactational amenorrhea, Pills, Emergency contraceptives

  • Option 2)

    Barrier method, Lactional amenorrhea, Pills

  • Option 3)

    CuT, Pills, Emergency contraceptive

  • Option 4)

    Pills, Emergency contraceptives, Barrier method

  Lactational amenorrhea (absence of menstruation) - Is another natural method to avoid pregnancy. - wherein This method is based on the fact that ovulation and therefore the cycle do not occur during the period of intense lactation following parturition. Therefore, as long as the mother breastfeeds the child fully, chances of conception are almost nil.       Lactational amenorrhea is marked...

Placentation, in which ovules develop on the inner wall of the ovary or in the peripheral part is:

 

  • Option 1)

    Basal

  • Option 2)

    Axile

  • Option 3)

    Parietal

  • Option 4)

    Free central

The arranfgemment of ovules within, the ovary is known as placentaion. The placentations are of different types - marginal, axile, parietal, basal, central and free - central. The ovules develpo in the inner wall of the ovary or on peripheral part in parietal placentation. In this type, ovary is one chambered but becomes two chambered due to the presence of false septum called replum, e.g,...

Which one of the following statements regulating post - fertilization development in flowering plants is incorrect?

 

  • Option 1)

    Ovary develpos into the fruit 

  • Option 2)

    Zygote develops into embryo

  • Option 3)

    Central cell develops into endosperm

  • Option 4)

    Ovules develop innto embryo sac

A DIFFERENTIATED CELL IN OVULE DEVELOP INTO MMC WHICH UNDERGOES MEIOSIS TO GIVE MEGASPORE WHICH DEVELOPS INTO EMBRYOSAC.....AND OVULE DO NOT DEVELOP INTO EMBRYOSAC.......AND BASICALLY FORMATION OF EMBRYOSAC IS PREFERTILIZATION EVENT

Extrtusion of second polar body from egg nucleus occurs:

 

  • Option 1)

    after entry of sperm but before fertilization 

  • Option 2)

    after fertilization 

  • Option 3)

    before entry of sperm into ovum

  • Option 4)

    simultaneously with first cleavge 

  Second Polar body - This induces the completion of the meiotic division of the secondary oocyte. The second meiotic division is also unequal and results in the formation of a second polar body and a haploid ovum (ootid) . -     Extrusion of second polar body from egg nucleus occurs during the entry of sperm but before fertilization. It occurs as a consequence of oocycte activation which is...

In some plants, the female gamete develops into embryo without fertilization. This phenomenon is known as:

 

  • Option 1)

    Autogamy

  • Option 2)

    Parthenocarpy

  • Option 3)

    Syngamy 

  • Option 4)

    Parthenogenesis

  Parthenogenesis - In a few organisms, the female gamete undergoes development to form new organisms without fertilisation.  - wherein Eg., rotifers, honeybees and even some lizards and birds (turkey).       When female gamete does not undergo fertilization and gets developed into embryo the process is called parhenogenesis.It occurs in some plants and many animals.  Parthenocrapy is formation...
Chlamydiasis is caused by?
Chlamydia is a sexually transmitted bacterial infection caused by the bacterium Chlamydia trachomatis. It affects both men and women and is spread during sexual contact. Chlamydia, which strikes over 4 million Americans a year, is the most common bacterial sexually transmitted disease (STD) in the U.S. Scientists believe it's twice as common as gonorrhoea and 30 times as common as syphilis.
Difference between persistent synegrid and degenerated synegrid?And which embryo sac cell allow pollen tube entry and why?
Degenerated synergid is that synergid which starts degenerating at the time of pollination and its secretions attract the pollen tube towards micropyle. Persistent synergid is the other synergid that persists and starts degenerating at the time of fertilisatio. Thus the difference between both is in their timing of degeneration during reproduction.The entry of pollen tube may occur through...
1548664634112..jpg
In Q. 92. it is very clear that the bacterial cell replicate once in every min. that means it produce its double in every min and within 23 min it fills a bottle, then it is obvious that it will take 23-1 min to fill half of the bottle. means the correct answer is 22min.

 

DNA replication in bacteria occurs:

Your Answer:

Just before transcription

 

Given answer is the correct one.
Both the angiosperm egg and human egg are stationary .. is it correct?
What is the difference between opsonisation and phagocytosis?
@Vikas Dutt Q. What is the difference between opsonization and phagocytosis? phagocytosis is (immunology|cytology) the process where a cell incorporates a particle by extending pseudopodia and drawing the particle into a vacuole of its cytoplasm while opsonization is the process of coating pathogens to promote phagocytosis and the protein which perform this function are called opsonins.
What are t tubules ?,kindly explain their structure and function
@praveen s T-tubules: are extensions of the cell membrane that penetrate into the centre of skeletal and cardiac muscle cells. With membranes that contain large concentrations of ion channels, transporters, and pumps, T-tubules permit rapid transmission of the action potential into the cell. Function: T-tubules permit rapid transmission of the action potential into the cell, and also play an...
Medical
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Match the items given in Column I with those in Column II and select the correct option given below : 

  Column I   Column II
a. Proliferative Phase i. Breakdown of endometrial lining
b. Secretory Phase ii. Follicular Phase
c. Menstruation iii. Luteal Phase

 

  • Option 1)
    a b c
    ii iii i

     

  • Option 2)
    a b c
    i iii ii
  • Option 3)
    a b c
    iii ii i
  • Option 4)
    a b c
    iii i ii
 

Correct answer: Option 1  

Medical
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The contraceptive 'SAHELI'

  • Option 1)

    is an IUD.

  • Option 2)

    increases the concentration of estrogen and prevents ovulation in females.

  • Option 3)

    blocks estrogen receptors in the uterus , preventing eggs from getting implanted.

  • Option 4)

    is a post - coital contraceptive.

 

Option 3 is aright answer

 

Medical
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The difference between spermiogenesis and spermiation is

  • Option 1)

    In spermiogensis spermatozoa from sertoli cells are released into the cavity of seminiferous tubules , while in spermiation spermatozoa are formed .

  • Option 2)

    In spermiogenesis spermatozoa are formed , while in spermiation spermatids are formed .

  • Option 3)

    In spermiogensis spermatids are formed , while in spermiation spermatozoa are formed.

  • Option 4)

    In spermiogenesis spermatozoa are formed , while in spermiation spermatozoa are released from sertoli cells into the cavity of seminiferous tubules.

 

As we learnt in

Sperms -

The spermatids are transformed into spermatozoa (sperms) by the process called spermiogenesis

-

Spermiation -

After spermiogenesis, sperm heads become embedded in the Sertoli cells, and are finally released from the seminiferous tubules by the process called spermiation

-

Spermiogenesis is transformation of spermatids into spermatozoa whereas spermiation is the release of the sperms from sertoli cells into the lumen of seminiferous tubule.

 


Option 1)

In spermiogensis spermatozoa from sertoli cells are released into the cavity of seminiferous tubules , while in spermiation spermatozoa are formed .

This is incorrect.

Option 2)

In spermiogenesis spermatozoa are formed , while in spermiation spermatids are formed .

This is incorrect.

Option 3)

In spermiogensis spermatids are formed , while in spermiation spermatozoa are formed.

This is incorrect.

Option 4)

In spermiogenesis spermatozoa are formed , while in spermiation spermatozoa are released from sertoli cells into the cavity of seminiferous tubules.

This is correct.

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Medical
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Hormones secreted by the placenta to maintain pregnancy are

  • Option 1)

    hCG , hPL , progestogens , estrogens

  • Option 2)

    hCG , hPL , estrogens , relaxin , oxytocin

  • Option 3)

    hCG , hPL , progestogens , prolactin

  • Option 4)

    hCG , progestogens , estrogens , glucocorticoids

 
As we learnt in Foetal ejection reflex. - The signals for parturition originate from the fully developed foetus and the placenta which induce mild uterine contractions called foetal ejection reflex. - wherein This triggers release of oxytocin from the maternal pituitary. Oxytocin acts on the uterine muscle and causes stronger uterine contractions, which in turn stimulates further secretion of...
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