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(a) When and where does spermatogenesis ...

(a) When and where does spermatogenesis occur in human male ?
(b) Draw a diagram of a mature human male gamete and label the following parts : acrosome, middle piece and tail
(c) mention the function of acrosome and middle piece

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(a) In tests , the immature male germ (spermatogonia) produce sperms by spermatogenesis that begin at puberty.
(b) See Q.29,(or) Set-III , Delhi Board-2009
Functtion of acrosome: A plasma members envelops the whole body of sperm . The sperm head contains an elongated haploid nucels , the anterior portion of which is covered by a cap-like structure called acrosome . The acrosome is filled with enymes that help fertilise te ovum .
Funcultion of middle piece : Middle piece dcontains a number of mitochondria , that provide energy for the motility of sperms.
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(a) When and Where does spermatogenesis occur in human male ? (b) Draw a diagram of a mature human male gamete. Label the following parts: acrosome, nucleus, middle piece and tail. (c) Mention the functions of acrosome and middle piece.

Draw a diagram of the microscopic structure of human sperm. Label the following parts in it and write their functions. (a) Acrosome (b) Nucleus (c) Middle piece

Draw a diagram of mature human sperm . Label any three parts and write their function .

(a) When and where does spermatogenesis in human male begin to take place? (b) With the help of schematic diagram, trace the development of mature spermatozoa in a human male.

Study the diagram given alongside and answer the questions that follow: Draw a neat diagram of the human sperm as seen under high magnification and label the following parts. (a) Acrosome (b) Mitochondria

(a) Draw a diagram of the structure of a human ovum surrounded by corona radiata. Label the following parts : (i) Ovum, (ii) Plasma Membrane, (iii) Zona Pellucida (b) State the function of Zona Pellucida.

(a) Name the hormone that initiates spermatogenesis in humans. Describe the process of spermatogenesis in spermatogenesis in sequence mentioning the ploidy of the cells at each step. (b) Draw the diagram of a mature human sperm and label the parts that : (i) helps it reaching to the ovum . (ii) providing energy for it to reach the ovum. (iii) helping it to gain entry into the ovum.

Study the diagram given below and then answer the questions that follow : (i) Name the part labelled A. Name any two hormones produced by the part labelled A. (ii) What happens to the part labelled B if : (1) fertilisation takes place? (2) fertilisation does not take place ? (iii) Where does fertilisation occur ? (iv) Draw a neat diagram of the human sperm as seen under high magnification and label the following parts: (a) Acrosome (b) Mitochondria.

Draw a diagram of the human eye as seen in a vertical section and label the parts which suits the following functions/descriptions : The region of distinct vision.

Write the function of each of the following : (a) Middle piece in human sperm. (b) Tapeturn in anthers. (c) Luteinizing hormone in human males.

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