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Penetration of spermatozoan into the egg...

Penetration of spermatozoan into the egg at fertilisation triggers metaphase-II in the secondary oocyte. This phenomenon is known as .......

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egg activation
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The secondary oocyte is arrested at ..... before fertilisation.

The delivery of a foreign DNA fragment into the fertilised egg with a micropipette is known as ………………… .

Consider the following statements. (i) Polyspermy may bring about fertilisation of egg by more than one male nucleus or the supernumerary sperms may fertilise other components of embryo sac much as synergids or antipodals. (ii) In angiosperms, pollen tube is normally an unbranched structure which ususally persists after fertilisation. (iii) Intine is the inner, pectocellulosic layer of pollen grain wall which is destroyed during acetolysis. (iv) Exine layer of pollen grain comprises of an outer non-sculptured layer sexine and an inner sculptured layer tectum. Which of the following combinations of above given statements is correct ?

Identify the statements as correct or incorrect with explanations for your answer (i) FSH acts on the Leydig cells and stimulates synthesis and secretion of androgens. (ii) The increased level of GnRH acts on the anterior pituitary and stimulates the secretion of gonadotropins, i.e. LH and FSH. (iii) The fully grown primary oocyte completes mitotic division producing two daughter nuclei, i.e. secondary oocyte and first polar body. (iv) Ovum is a rounded, motile cell having abundant cytoplasm called ooplasm and a large nucleus termed as germinal vesicle.

On the basis of the functions mentioned below, identify each one correctly (i) It helps in the movement of spermatozoan in a fluid medium. (ii) It contains hydrolytic enzymes and is used to contact and penetrate the egg during fertilisation.

Double fertilisation in an angiosperms plant means (a) fusion of two egg cells with two male gametes (b) fusion of egg cell twice with male gametes (c) fusion of one male gamete with the egg cell and the other male gamete with the synergid (d) fusion of one male gamete with the egg cell and the other male gamete with secondary nucleus

ARIHANT PUBLICATION-HUMAN REPRODUCTION -ODISHA BUREAU.S TEXTBOOK SOLUTIONS (A Very Short Answer Type Questions) (Fill in the blanks)
  1. The early development of the ovarian follicles is stimulated by .........

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  2. Luteinizing hormone stimulates ..... cells of the testis.

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  3. The final maturation of the ovarian follicles and ovulation are stimul...

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  4. The prostatic fluid contains an acid called ......

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  5. Prostate Specific Antigens (PSAs) help in the diagnosis of .......

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  6. The swollen tip of the penis is known as .........

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  7. The erectile tissue of the penis is constituted by ...... and .......

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  8. The seminal vesicles discharge into vas deferens through .......

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  9. The peritoneal fold by which the ovary is attached to the broad ligame...

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  10. Primary oocyte gets arrested at ......... stage of meiosis-I.

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  11. The layers of cuboidal follicular cells surrounding the primary oocyte...

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  12. Stromal cells, surrounding the granulosa cells are known as ...... cel...

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  13. The egg is ovulated at ...... stage.

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  14. The non-cellular layer surrounding the primary oocyte is known as .......

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  15. The inner epithelial lining of the uterus is known as .......

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  16. The menstrual cycle spans ..... days and the ovulation occurs on the d...

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  17. The secondary oocyte is arrested at ..... before fertilisation.

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  18. Penetration of spermatozoan into the egg at fertilisation triggers met...

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  19. Following the failure of fertilisation, the corpus luteum regresses in...

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  20. Corpus luteum is the main source of oestrogen and .......

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