CBSE Class 12 Biology Sexual Reproduction In Human Beings Worksheet

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REPRODUCTION IN HUMAN BEINGS
 
1 Write the function of fimbriae. 
 
2 Name the different layers of human uterus. Which one of these layers undergoe cyclic changes during menstrual cycle? identify the hormone essential for the maintenance of this layer.
 
3 Where are Leydig cells present? What is their role in reproduction? 
 
4 Describe the role of placenta as an endocrine tissue .
 
5 Why are the human testes located outside the abdominal cavity? Name the pouch in which they are present.
 
6 Differentiate between major structural changes in the human ovary during the follicular and luteal phase of the menstrual cycle.
 
7 Mention the fate of Corpus Luteum and its effect on the uterus in absence of fertilisation of the ovum in a human female.
 
8 Spermatogenesis in human males is a hormone regulated process. Justify. 
 
9 What happens to corpus luteum in human female if the ovum is (i) fertilized, (ii) not fertilized?
 
10 Draw a labelled diagram of the microscopic structure of a human sperm. 
 
11
CBSE Class 12 Biology Sexual Reproduction In Human Beings Worksheet 1
Read the graph given above and correlate the uterine events that take place according to the hormone levels on:
i) 6-15 days
ii) 16-25 days
iii) 26-28 days ( if the ovum is fertilised)
 
b) Specify the sources of the hormones mentioned in the graph.
 
12 Study the figure given below and answer the questions that follow:
CBSE Class 12 Biology Sexual Reproduction In Human Beings Worksheet 2
a) Name the stage of human embryo the figure represents.
b) Identify ‘a’ in the figure and mention its function.
c) Mention the fate of the inner cell mass after implantation in the uterus.
d) Where are the stem cells located in this embryo?
 
13 Mention the target cells of luteinising hormone in human males and females. Explain the effect and the changes which the hormone induces in each case.
 
14 Name the source of gonadotrophins in human females. Explain the changes brought about in the ovary by these hormones during menstrual cycle.
 
15 (a) Explain the events taking place at the time of fertilization of an ovum in a human female.
(b) Trace the development of the zygote upto its implantation in the uterus.
 
16 When and where are primary oocytes formed in a human female? Trace the development of these oocytes till ovulation ( in menstrual cycle). How do gonadotrophins influence this developemental process?
 
17 Explain the events in a normal woman during her menstrual cycle on the following days: (a) Pituitary hormone levels from 8 to 12 days. (b) Uterine events from 13 to 15 days. (c) Ovarian events from 16 to 23 days.
 
18 a) Write the specific location and the functions of the following cells in
 
human males :
(i) Leydig cells
(ii) Sertoli cells
(iii) Primary spermatocyte
 
(b) Explain the role of any two accessory glands in human male reproductive system

 

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Exam Preparation Worksheet for Class 12 Biology Chapter 01 Reproduction in Organisms

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