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प्रश्न
Name the three main regions of the human sperm, and briefly mention the function of each.
उत्तर
- Head (Acrosome): The acrosome at the top of the head of the sperm secretes an enzyme (hyaluronidase), which facilitates entry of the sperm into the egg by dissolving the wall of the ovum.
- Middle Piece (Mitochondria): The mitochondria contained in the middle piece, provide energy (ATP) for the activity of the sperm to swim.
- Tail (Axial Filament): The tail makes lashing movements for propulsion.
संबंधित प्रश्न
Define the term Gamete.
Define the Zygote.
The diagram given below is that of a developing human foetus in the womb. Study the same and answer the question that follow:
How many days does the foetus take to be fully developed?
Give Reasons
The acrosome of sperm secretes an enzyme called hyaluronidase at the time of fertilization
Differentiate
Isogametes and Heterogametes.
Study the diagram given below and then answer the questions that follow:
(i) Name the part labeled A. Name any two hormones produced by the part labeled A.
(ii) What happens to the part labeled B.
(1) if fertilization takes place?
(2) If fertilization does not take place?
(iii) Where does fertilization occur?
(iv) Draw a neat diagram of the human sperm as seen under high magnification and label the following parts.
(1) Acrosome
(2) Mitochondria
Complete the following sentences with appropriate word:
One egg is normally released from the ovary in the human females after
__________
Define.
Fertilization
The eggs of frogs do not have shells for protection, yet they are safe in water, how?
Match the items in column I with those in column II and write down the matching pairs (some may not match).
| Column I | Column II | ||
| (a) | Acrosome | (i) | An embryo which looks like human baby. |
| (b) | Gestation | (ii) | Luteinizing hormone |
| (c) | Menopause | (iii) | Ovum producing cells. |
| (d) | Foetus | (iv) | Semen |
| (e) | Oogenesis | (v) | Spermatozoa |
| (f) | Ovulation | (vi) | Complete stoppage of menstrual cycle. |
| (vii) | Time taken by a fertilised egg till the delivery of baby. |
