Describe the Structure of a Seminiferous Tubule. - Biology


Describe the structure of a seminiferous tubule.

Draw a labelled diagrammatic sectional view of a human seminiferous tubule.


Solution 1

The production of sperms in the testes takes place in a highly coiled structure called the seminiferous tubules. These tubules are located in the testicular lobules. Each seminiferous tubule is lined by germinal epithelium. It is lined on its inner side by two types of cells namely spermatogonia and sertoli cells respectively. Spermatogonia are male germ cells which produce primary spermatocytes by meiotic divisions. Primary spermatocytes undergo further meiotic division to form secondary spermatocytes and finally, spermatids. Spermatids later metamorphoses into male gametes called spermatozoa. Sertoli cells are known as nurse cells of the testes as they provide nourishment to the germ cells. There are large polygonal cells known as interstitial cells or leydig cells just adjacent to seminiferous tubules. These cells secrete the male hormone called testosterone.

Solution 2

Labelled sectional view of seminiferous tubules of humans:

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Chapter 3: Human Reproduction - Exercises [Page 56]

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With the help of a neat, labelled diagram describe the human male reproductive system.

Write the location and function of the Sertoli cells in humans.

Write the location and functions of the following in human testes :

Leydig cells

Describe the human male reproductive system.

The external layer of connective tissue sheath of human testis is __________.

Pituitary dwarfism is treated with gene therapy by____

(A) Human insulin
(B) Tissue growth factor - Beta
(C) Tissue plasmogen activator
(D) Human growth hormone producer gene

Describe the T.S. of human testis

Differentiate between Human skin cell and Human ovum (number of chromosomes).

Write a note on human sperm

Draw a labelled diagram of L.S. of human testis.

Define Spermatogenesis

Define Reproductive health

Put a tick mark (✓) against the correct alternative in the following statement:

The testes are located within the:

Put a tick mark (✓) against the correct alternative in the following statement:

Identify the stage which is formed after the fertilisation of the egg by the sperm?

Distinguish between the following pair of terms:

Egg and sperm.

List the structures, in their correct sequence, through which the sperms must pass from the time they are produced in the testes to the time they leave the urethra.

State the function of Testes.

State the function of Seminal vesicle.

Given alongside is a diagram of male reproductive system in humans. Label the parts indicated by numbers 1 to 5, and state their functions.

Fill in the blank:

The sac-like structure present outside the body and which contains testes is called _________.

Fill in the blank:

Male gemetes are produced inside _______.

Mention the functions of Testis.

Describe the functions of the following: 

Prostate gland 

Differentiate between primary and accessory reproductive organs 

Given below is the schematic diagram of the sectional view of the human male reproductive system. 


Name the parts numbered 1-11.

Differentiate between Vas deferens and vasa efferentia.

Differentiate between Spermatogenesis and spermiogenesis.

Sketch the labeled diagram:

Human male reproductive system 

Choose the correct answer:
Removal of testes is called ____________

Name the various organs of the male reproductive system of man.


Urinogenital duct and Ureter.

Given below is a diagram of the lateral section of the testis of a man. Study the same and answer the questions that follow:

(i) Label the parts numbered 1 to 4 of the diagram.
(ii) State the functions of the parts labeled 1 and 3.
(iii)What is the significance of the testes being located in the scrotal sac outside the abdomen?
(vi)What is the role played by the inguinal canal?
(v) What is semen?

Explain the term Vasectomy.

Multiple Choice Question:

If the vas deference of a man are surgically disconnected or removed.

In humans, there are ____________ pairs of chromosomes.

In humans, sperm production occurs in the organ __________.

Hormones related to male reproductive system.

How are the sperms formed?

How is the semen produced?

State names of organs in male reproductive system.

Write the answers to the questions by observing the figure.

  1. What does the above figure show?
  2. Write the names of parts A, B, C, D.
  3. Write the function of the part 'D'.
  4. How is semen formed?

The large elongated cells that provide nutrition to developing sperms are ______

Name the secondary sex organs in males. 

Why are the human testes located outside the abdominal cavity? Name the pouch in which they are present.

What is the enzyme present in the acrosome of sperm?

The increased level of estrogen and progesterone is responsible for menstruation.

Which of the following is a secondary sexual character observed in males?

Which hormone controls the secondary sexual characters in males?

Which of the following correctly describes the rete testis?

Cowper's gland is homologous in function to ______

In the male reproductive system, the vasa efferentia opens into the ______.

Semen is secreted by ______.

All are accessory ducts in males, EXCEPT

lf vasectomized man attempts to rape, then the presence of which of the following confirms it?

The ________ secrete testosterone after puberty.

How many spermatozoa will be produced from 10 million spermatids?

Vasa efferentia are the ductules leading from ______.

Location and secretion of Leydig’s cells are ______.

Seminal plasma in humans is rich in ______.

Seminal plasma in human males is rich in ______.

Semen is a constituent of seminal plasma with ______.

Spot the odd one out from the following structures with reference to the male reproductive system.

ells of Leydig occur in ______.

Seminal plasma in human males is rich in ______.

The primary sex organ of a human male is ______.

Seminal plasma, the fluid part of semen is formed by ______.

Along the path of the vas-deferens the secretions of which gland provide nutrition to the sperms?

A pair of ducts arising from testis, which carries sperms are ______ 

In the following Question, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:

Assertion: In the male reproductive system, the transport of sperm takes place in a fluid that also provides nutrition.

Reason: Protective glands and seminal vesicles secret in the vas deferens.

During adolescence, several changes occur in the human body. Mark one change associated with sexual maturation in boys

In human males, the testes lie in the scrotum, because it helps in the

Give two reasons for the appearance of variations among the progeny formed by sexual reproduction.

Why do only male gametes have a tail?

Crypts of Lieberkuhn are absent in ______.

Mature sperms in humans are stored in ______.

The shared terminal duct of the reproductive and urinary system in the human male is ______.

The Leydig cells as found in the human, body are the secretory source of ______.

Cell at the end of first meiotic division male sperm differentiates into ______.

______ is the smallest cell in males.

______ carries sperms to the seminal vesicles.

The process of formation of sperms is known as ______.

Small sac-like muscular structures that enclose testes.

Give reasons for the following

Scrotum remains outside the body of human males.

Accessory glands of male reproductive system are

Vasa efferentia exist in between:

The path of sperm transport is given below. Provide the missing steps in blank boxes.

How do sperms develop?

What are the components of semen?

Identify A, B, C, D, in the given diagram of the human reproductive system:

Explain the function of the following structure in the human male reproductive system.

Leydig cells

Given below is a certain situation. Analyze and describe its possible impact on a person:

Testes of a male boy are not able to descend into the scrotum during his embryonic development.

Given below is a certain situation. Analyze and describe its possible impact on a person:

Prostate and seminal vesicles are not functional.

Describe the function of Bulbourethral glands.

Give reason: Testes are located outside the body cavity in scrotal sacs.

Draw a neat labeled diagram of T.S. of testis.

Mention the location and the function of Leydig cells.

In humans, sperm production occurs in the organ ______.

List two roles of Seminal vesicles and prostate gland in the human reproductive system.

List two roles of the Testis in the human reproductive system.

Answer the following question based on the human male reproductive system:

In which organ sperms are formed?

Answer the following question based on the human male reproductive system:

What is the length of a sperm?


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