Which of the following roles is/are played by epididymis, vas deferens, seminal vesicles and prostate in male reproductive system of human?
- A.Spermatogenesis and maturation of sperms
- B.Maturation and motility of sperms
- C.Spermatogenesis and motility of sperms
- D.Motility of sperms only
Correct answer
Explanation
The correct answer is B, maturation and motility of sperms. These ducts and glands do not make sperm; they help sperm mature, store and move them, and add the fluid in which sperm swim. Sperm are produced by spermatogenesis in the seminiferous tubules of the testes. They then pass into the epididymis, a coiled tube on the back of each testis, where they mature and become able to swim. The vas deferens carries them upward during ejaculation. The seminal vesicles add a fluid rich in fructose that gives sperm energy, and the prostate adds a milky alkaline fluid that protects them from the acidity of the female tract. Together these secretions form semen and keep the sperm active. Option A is wrong because spermatogenesis happens only in the testes. Option C is wrong for the same reason. Option D is wrong because maturation in the epididymis is also one of their roles. Exam tip: testes make sperm; epididymis matures them; seminal vesicles and prostate make semen.
Practice Questions
View allWhich one of the following plant tissues has dead cells ?
- A.Epidermis
- B.Parenchyma
- C.Collenchyma
- D.Sclerenchyma
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Sclerenchyma cells are dead at maturity, with thick walls hardened by lignin. Sclerenchyma is the tissue that makes plants hard and stiff.
Read the full explanation →Imagine a current-carrying straight conductor with magnetic field of lines in anti-clockwise direction. Then the direction of current is determined by
- A.the Right-Hand Thumb rule and it would be in the downward direction.
- B.the Left-Hand Thumb rule and it would be in the downward direction.
- C.the Right-Hand Thumb rule and it would be in the upward direction.
- D.the Left-Hand Thumb rule and it would be in the upward direction.
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For a straight wire, the right-hand thumb rule links the current to the circular field lines around it. Hold the wire in the right hand with the thumb along the current; the curled fingers then show the direction of the magnetic field lines, which form concentric circles around the wire.
Read the full explanation →Which one of the following statements is true for sound waves propagating in air?
- A.Sound is an electromagnetic wave and transverse in nature
- B.Sound is a mechanical wave and longitudinal in nature
- C.Sound is a mechanical wave and transverse in nature
- D.Sound is an electromagnetic wave and longitudinal in nature
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Sound needs a material medium to travel, and in air its particles vibrate back and forth along the direction the wave moves.
Read the full explanation →Which one of the following is primarily responsible for conduction of current in a metal?
- A.Bound electrons
- B.Free electrons
- C.Both bound and free electrons
- D.Ions
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In a metal, the outer electrons of the atoms are not tied to any one atom and drift through the lattice when a voltage is applied, carrying the current.
Read the full explanation →Which one of the following statements is correct about the magnification of an optical microscope?
- A.Magnification increases with the increase in focal length of eyepiece
- B.Magnification increases with the increase in focal length of objective
- C.Magnification does not depend upon the focal length of eyepiece
- D.Magnification decreases with the increase in focal length of eyepiece
Show answer
A compound microscope magnifies more when both its lenses have short focal lengths. In a compound microscope the objective forms a real, enlarged image, and the eyepiece magnifies it further like a simple magnifier.
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