Reproduction | Animal, Bat, Pangolin Reproduction, Monarch Butterfly, Jellyfish Reproduction

We are going to cover Reproduction | Animal, Bat, Pangolin Reproduction, Monarch Butterfly, Jellyfish Reproduction Topic. Firstly we will discuss important definitions after that quiz section.

Reproduction in Animals | Reproduction in Biology


Female egg | Parts of the vaginal system



Reproduction fertility and development 



Whale Reproduction



Fertilization in plants



Artificial Reproduction




Luteinizing hormone in females



Turtle reproduction



Elephant Reproduction



Dolphin Reproduction


Octopus Reproduction



Platypus reproduction


reproduction of cow


reproduction in human


salmon reproduction


Male genital anatomy


clownfish reproduction


Clownfish reproduction



Reproduction in Female



blue whale reproduction


Reproduction in science




Fish reproduction



Komodo dragon reproduction




Q.1. Definitions:

Ans. 1. Gametogenesis: It is the process involved in the maturation of the two highly specialised cells, spermatozoon in male and Ovum in female before they unite to form zygote is known as gametogenesis.

  1. Oogenesis: It is the process involved in the development of a Mature Ovum.
  2. Spermatogenesis: It is the process involved in the development of spermatids from the primordial male germ cells and their differentiation into spermatozoa.
  3. Capacitation: It signifies the physiochemical changes that occur in the sperm to make it capable of fertilizing the ovum.
  4. Ovulation: Ovulation is a process where by a secondary Oocyte is released from the Ovary following rupture of a Mature graafian follicle and becom available for conception.
  5. Fertilization: Fertilization is the process of fusing of the spermatozoon with the Mature Ovum. Almost always it occurs in the ampullary part of the uter tube.
  6. Decidua : Decidua is the endometrium of the pregnant uterus. It is so increased because much of it is shed following delivery.
  7. Chorion: It is the outermost layer of 2 fetel membranes.
  8. Nitabuch’s Membrane: The appearance of fibrinoid deposit on the syncytiotrophoblast outside the trophoblastic shell is called Nibbuch’s Membrane.
  9. Chorionic Villi: These are the fingerlike buds of trophoblastic layer that projects out on the surface of embedded blastocyst

Q.2. List the Causes of Ovulation.

Ans: (a) Endocrinal

(1) LH Surge

(2) FSH rise

(b) Stretching factor

Q.3. Where do fertilization occur?

Ans. Fertilization occurs mostly in the Ampullary part of the uterine tube.

Q.4. What are the Objectives of fertilization?

Ans. It has 2 objectives.

(a) To initiate embryonic development of the egg. (b) To restore the chromosome number of the species.

Q.5. How much time does it take for the sperms to reach the site?

Ans. It takes about 2hr for the sperms to reach the site.

Q.6. How many sperms can enter the zona Pellucida?

Ans. More than one sperm may penetrate the zona pellucida.

Q.7. How does a sperm finally act?

Ans. Out of many sperms, one touches the Vitelline Membrane soon, penetration of the other sperm is prevented and immobilisation of sperms present inside the zone pellucida occurs of by zone/ reaction and vitelline block.

Q.8. How is the x pattern of child determined?

Ans. Sex of the child is determined by the pattern of sex chromosome supplied by the spermatozoon. If the spermatozoon contains ‘X’ chromosomes then a female embryo is formed (46, xx). If it contains “y” chromosome, a male embryo (46, xx) is formed.

Q.9. When is the 2 cell (Morula) stage reached?

Ans. The 2-cell stage is reached approximately 30 hours after fertilization.

Q.10. When & where does implantation occur?

Ans. Implantation occurs in the Endometrium of the anterior or posterior wall of the body of uterus, near the fundus on the 6th day which corresponds to the 20th day of a regular Menstrual cycle.

Q.11. What is Interstitital Implantation ?

Ans. Deeper penetration of human blastocyst is called interstitial implantation.

Q.12. To what do the trophoblast differentiate?

Ans. Just before implantation the trophoblast is further differentiated to an inner cellular layer called

(a) Cytotrophoblast (Langhan’s layer) and as outer layer of

(b) Multinucleated synticium called syntitio or Plasmo diotrophoblast.

(c) Contraction of the Micromuscles.

Q.13. What all do develop from trophoblasť?

Ans. Placenta and fetal membranes are developed from the trophoblast.

Q.14. List the functions of trophoblast.

Ans. It serves at least 3 imp. functions.

(a) Invasion.

(b) Nutrition.

(c) Production of hormones for the maintenance of pregnancy.

Q.15. What is decidua?

Ans. It is the Endometrium of pregnant uterus.

Q.16. Enlist the layers of decidua before Implantation?

Ans. The well developed decidua differentiates into 3 layers.

(a) Superficial Compact layer.

(b) Intermediate spongy layer.

(c) Thin basal layer.

Q.17. Name the above layers after implantation.

Or With what names are the above layers renamed after implantation?

Ans. 1. Decidua basalis or Scrotina.

  1. Decidua capsularis or Reflexa.
  2. Decidua vera or Parietalis.

Q.19. Explain the structure of a mature spermatozoon?

Ans. It has got 2 parts.

(a) Head: Consists of condensed nucleus & Acrosomal Cap.

(b) Tail: It has neck, the middle piece, the principal piece and the end piece.

Q.20. How many Arteries of veins does the Umbilical Cord Possess?

Ans. Umbilical Cord has 2 arteries and 2 veins of the 2 Umbilica veins the right one disappears by the 4th month leaving behind 1 vein.

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