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Gametogenesis And Menstrual Cycle Free Doubts and Solutions

CBSE - XII Science - Biology - Human Reproduction

Zona pellucida is secreted by 1) primary follicle 2) granulosa cells 3) secondary oocyte 4) membrana granulosa

Asked by heraomair29 24th April 2018, 1:37 PM
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CBSE - XII Science - Biology - Human Reproduction

Name the meiocyte in male gametogenesis in man and woman.

Asked by rohitraman1115 21st April 2018, 8:01 AM
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CBSE - XII Science - Biology - Human Reproduction

Explain the role of pitutary hormones in various phases of human menstrual cycle.

Asked by pksunilnair 12th December 2017, 9:11 PM
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CBSE - XII Science - Biology - Human Reproduction

Differentiate between spermatogenesis and oogenesis.

Asked by sunil2791 30th May 2017, 11:13 AM
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CBSE - XII Science - Biology - Human Reproduction

why chances of fertilization are more at ampullary isthmus junctiom?

Asked by upmaniousagarika 8th June 2016, 11:18 PM
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CBSE - XII Science - Biology - Human Reproduction

Human female is not fertile after menopause whereas human males can produce gametes at any stage of their age after puberty. Analyse the statement giving appropiate explanation.

Asked by Pragnya Kar 18th March 2016, 12:56 AM
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CBSE - XII Science - Biology - Human Reproduction

WHAT HAPPENS IN OVULATION AND HOW IT IS DIFFRENT FROM MENSTRUAL CYCLE?

Asked by Shahwar 7th June 2015, 10:46 PM
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CBSE - XII Science - Biology - Human Reproduction

Corpus luteum degenerates after 3 to 4 months of pregnancy, then how is it possible that it secretes relaxin at the end of pregnancy? Please explain the concept in detail.

Asked by shubham.padamwar.3 29th January 2015, 1:25 PM
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CBSE - XII Science - Biology - Human Reproduction

What is membrane granulose, does it forms theca folliculi? If not, what forms theca folliculi?

Please explain the concept in detail.

Asked by shubham.padamwar.3 29th January 2015, 1:21 PM
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CBSE - XII Science - Biology - Human Reproduction

Give a schematic labelled diagram to represent oogenesis (without description).

Asked by Topperlearning User 11th June 2014, 3:42 PM
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CBSE - XII Science - Biology - Human Reproduction

Study the figure given: (i) Pick out and name the cells that undergo spermiogenesis. (ii) Name cells A and B. (iii) Give the ploidy of cells B and E. (iv) What are the cells marked as F? Mention their function. (v) Mention the type of cell division in A and B.        

Asked by Topperlearning User 11th June 2014, 3:33 PM
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CBSE - XII Science - Biology - Human Reproduction

During reproduction, the chromosome number (2n) reduces to half (n) in the gametes and again the original number (2n) is restored in the offspring. What are the processes through which these events take place?

Asked by Topperlearning User 11th June 2014, 3:33 PM
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CBSE - XII Science - Biology - Human Reproduction

The spermatogonial cell has 46 chromosomes in human male. Give the number of chromosomes in: (a) Primary spermatocyte (b) Spermatid

Asked by Topperlearning User 11th June 2014, 3:33 PM
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CBSE - XII Science - Biology - Human Reproduction

Why are menstrual cycles absent during pregnancy?

Asked by Topperlearning User 11th June 2014, 3:33 PM
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CBSE - XII Science - Biology - Human Reproduction

What is meant by LH surge? Write the role of LH.

Asked by Topperlearning User 11th June 2014, 3:33 PM
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CBSE - XII Science - Biology - Human Reproduction

How many sperms will be produced from 10 primary spermatocytes and how many eggs will be produced from 10 primary oocytes?

Asked by Topperlearning User 11th June 2014, 3:33 PM
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CBSE - XII Science - Biology - Human Reproduction

Assuming a spermatogonial cell has 30 chromosomes, how many chromosomes will be formed in: a) The primary spermatocyte b) a spermatid derived from the cell  Justify your answer.   

Asked by Topperlearning User 11th June 2014, 3:33 PM
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CBSE - XII Science - Biology - Human Reproduction

Mention the name and role of hormones which are involved in regulation of gamete formation in human males.

Asked by Topperlearning User 11th June 2014, 3:33 PM
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CBSE - XII Science - Biology - Human Reproduction

Given below is an incomplete flowchart showing the influence of hormone on gametogenesis in males. Observe the flowchart carefully and fill in the blank A, B, C and D.       

Asked by Topperlearning User 11th June 2014, 3:33 PM
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CBSE - XII Science - Biology - Human Reproduction

Differentiate between menarche and menopause.

Asked by Topperlearning User 11th June 2014, 3:33 PM
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CBSE - XII Science - Biology - Human Reproduction

Give reason for the following: (a) The first half of the menstrual cycle is called follicular phase as well as proliferative phase. (b) The second half of the menstrual cycle is called luteal phase as well as secretory phase.

Asked by Topperlearning User 11th June 2014, 3:33 PM
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CBSE - XII Science - Biology - Human Reproduction

Given below are the events in human reproduction. Write them in the correct sequential order. Insemination, Gametogenesis, Fertilization, Parturition, Gestation, Implantation.

Asked by Topperlearning User 11th June 2014, 3:33 PM
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CBSE - XII Science - Biology - Human Reproduction

Name the muscular and the glandular layers of human uterus. Which one of these layers undergoes cyclic changes during menstrual cycle? Name the hormone essential for the maintenance of this layer.

Asked by Topperlearning User 11th June 2014, 3:33 PM
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