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When a Human Female Reaches a Certain Age Then Vaginal Bleeding Occurs for a Few Days After Regular Time Intervals. (A) What is this Process Known as (I) in Scientific Terms, and (Ii) in Everyday Language? (B) at What Approximate Age this Process Starts in Human Females? When is the Human Female Said to Have Attained at this Stage? (C) After How Much Time is this Process Repeated? for How Many Days Does this Process Usually Last? (D) What Does the Onset of this Process in Human Females Signify? (E) at Which Particular Event in the Life of a Human Female Does this Process Stop Temporarily but Start Again? (F) at Which Approximate Age of Human Female Does this Process Stop Permanently? - Science

When a human female reaches a certain age then vaginal bleeding occurs for a few days after regular time intervals.
(a) What is this process known as (i) in scientific terms, and (ii) in everyday language?
(b) At what approximate age this process starts in human females? When is the human female said to have attained at this stage?
(c) After how much time is this process repeated? For how many days does this process usually last?
(d) What does the onset of this process in human females signify?
(e) At which particular event in the life of a human female does this process stop temporarily but start again?
(f) At which approximate age of human female does this process stop permanently?

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Solution

Answer 97:

(a) The process is termed as (i) menstruation scientifically and (ii) periods in everyday language.

(b) The approximate age for a girl to undergo her first period is between 10 and 12 years. A human female usually attains puberty or sexual maturity at this stage.

(c) This process is repeated after every 28 days and usually lasts for 3 to 5 days.

(d) The onset of this process signifies sexual maturity in human females.

(e) During pregnancy, this process stops temporarily but starts again eventually.

(f) At the age of about 45–50, this process stops permanently.

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Lakhmir Singh Class 10 Biology (Science)
Chapter 3 How do Organisms Reproduce?
Q 97 | Page 174
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