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प्रश्न
Read the following passage and answer the question that follows:
Rahini and her parents were watching a television programme. An advertisement flashed on the screen which was promoting the use of sanitary napkins. Rahini’s parents suddenly changed the channel, but she objected to her parents and explained the need and importance of such an advertisement.
What is first menstruation called? When does it occur?
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उत्तर
The first menstruation is called Menarche. In human females, the menstrual cycle starts at the age of 11 – 13 years which marks the onset of puberty.
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संबंधित प्रश्न
Draw a graafian follicle and label antrum and secondary oocyte.
Complete the following sentences with appropriate word:
The human gestation period is about ____________.
Describe the phases of the menstrual cycle and their hormonal control.
Explain the importance of cleanliness during the time of menstrual cycle in girls.
The temporary endocrine gland in humans is ______.
Corpus luteum ______.
Mention the importance of LH surge during menstrual cycle.
Given below is a flow chart showing ovarian changes during menstrual cycle. Fill in the spaces giving the name of the hormones responsible for the events shown.
In the figure given below, parts A and B show the level of hormones which influence the menstrual cycle. Study the figure and answer the questions that follow:
- Name the organs which secrete the hormones represented in parts A and B.
- State the impact of the hormones in part B on the uterus of the human female during 6 to 15 days of the menstrual cycle.
The figure show a section of human ovary. Select the option which gives the correct identification of either A or B with function/characteristic.
