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प्रश्न
Give two reasons for the appearance of variations among the progeny formed by sexual reproduction.
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उत्तर
Two reasons for the appearance of variations among the progeny formed by sexual reproduction are:
- Two parents, each with different set of characters take part in sexual reproduction.
- Gametes from two different individuals possess different combinations of genes which are combined in the zygote.
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संबंधित प्रश्न
Identify True/False statement. Correct false statement to make it true.
Spermatozoa get nutrition from Sertoli cells.
The external layer of connective tissue sheath of human testis is __________.
Write a note on human sperm
State the function of Seminal vesicle.
Define the following term:
Hernia
Sketch the labelled diagram.
Human male reproductive system.
Choose the correct answer:
Removal of testes is called ____________
Given on the right is a diagram which represents the reproductive organs of a man:
(i) Write the names of the parts numbered 1 to 16.
(ii) Give two functions of the part 6.
(iii) Name three components of the fluid which may be found in the tube labeled 2.
(iv) What is the main function of the part labelled 3?
Name the Following
The male gamete (male reproductive cells) of mammals.
Name the Following
The tubular knot fitting like a cap on the upper surface of the testes.
Hormones related to male reproductive system.
How are the sperms formed?
The large elongated cells that provide nutrition to developing sperms are ______
Semen is secreted by ______.
Vas deferens receives the duct of seminal vesicle and forms the ______.
Name the following:
Three accessory glands of human male reproductive system.
The thin-walled sac of skin in which testis descends is ______.
The figure given ahead is an organ system of humans. Study the same and answer the following questions.
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- Identify the organ system.
- Label the guidelines 1 to 7.
- Write one important role of parts 3 and 6.
- Name the cells of part 1 that produce testosterone.
- What is the significance of the part 1 being located in a separate sac suspended outside the body?
In which anatomical region is the male reproductive system located?
What is the enlarged tip of the penis called?
