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प्रश्न
How does fertilisation take place? Fertilisation occurs once in a month. Comment.
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उत्तर
In human beings, internal fertilization takes place in female body. During sexual intercourse, sperms reach the vagina and travel upto the fallopian tube where fertilization take place. Sperms deposited in the vagina reach there partly by their own movement and partly by local movements of reproductive tract. A single ovum is released by female roughly in the middle of menstrual cycle which has a span of 28 days. Thus, one egg is released every month from either of the ovaries. Fertilization occurs within 2-3 days of ovulation. Both sperm and ovum remain viable for 1-2 days only. Therefore, fertilization can occur only once in a month.
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संबंधित प्रश्न
Which part of the human body produces Ova?
Rewrite the terms in the correct order so as to be in a logical sequence.
Puberty, menopause, menstruals, menarche, reproductive age.
Differentiate between:
Prostate gland and cowper’s gland (the nature of secretion)
Complete the paragraph with the help of words given in the bracket.
(Luteinizing hormone, endometrium of uterus, follicle stimulating hormone, estrogen, progesterone, corpus luteum)
Growth of follicles present in the ovary occurs under the effect of ______. This follicle secretes estrogen. ______ grows/regenerates under the effect of estrogen. Under the effect of ______, fully grown up follicle bursts, ovulation occurs and ______ is formed from remaining part of follicle. It secrets ______ and ______. Under the effect of these hormones, glands of ______ are activated and it becomes ready for implantation.
Why is zona pellucid retained around the egg till it reaches the uterus?
Complete the following sentences with appropriate word:
The female equivalent of the penis is the _______.
State names of organs in the female reproductive system.
All are internal genitalia in females. EXCEPT ______.
Which of the following is a finger like structure and lies at the upper junction of the two labia minora above the urethral opening?
In 28 days human ovarian cycle, ovulation occurs on ______.
Which part of ovary in mammals acts as an endocrine gland after ovulation?
The finger-like projections, called fimbriae, help in the collection of ovum into the fallopian tube following ovulation.
To answer the question, study the graphs below for Subjects 1 and 2 showing different levels of certain hormones.
If the peak of Hormone A does not appear in the study for Subject 1, which of the following statement is true?
With a suitable diagram, describe the organisation of mammary gland.
The______ is also called the womb.
The ______ is also called the womb.
Statement I: The presence or absence of hymen is not a reliable indicator of virginity.
Statement II: The hymen is torn during the first coitus only.
In the light of the above statements, choose the correct answer from the options given below:
Complete the analogy with respect to reproductive system.
Male : Penis : : Female : ______.
Which part of the fallopian tube is closest to the ovary and has finger-like fimbriae at its edges?
Which statement correctly describes the basic composition of each breast?
