Advertisements
Advertisements
प्रश्न
Define spermiation.
Advertisements
उत्तर १
Spermiation is the process of releasing mature spermatozoa. In this, spermatozoa are shed into the lumen of the seminiferous tubule for transport.
उत्तर २
After spermiogenesis, sperm heads become embeded in sertoli cells from which they obtain their nutrition and finally get released into the lumen of seminiferous tubules. This process of release of mature sperms from sertoli cells is called spermiation.
APPEARS IN
संबंधित प्रश्न
Draw a diagram of the microscopic structure of human sperm. Label the following parts in it and write their functions:
- Acrosome
- Nucleus
- Middle piece
Ovulation is induced by a hormone called ______.
Draw a labelled diagram of sperm.
Fill in the blank.
---------- type of reproduction occurs without fusion of gametes.
At the time of birth, there are _______________ oocytes in the ovary of a female foetus.
Answer the following type of question Assertion (A) and Reason (R).
(A) - In human males, testes are extra-abdominal and lie in scrotal sacs.
(R) - Scrotum acts as a thermoregulator and keeps the temperature lower by 2°C for normal sperm production.
Describe the structure of the human ovum with a neat labelled diagram.
Expand the acronym.
hCG
The following is the illustration of the sequence of ovarian events (a-i) in a human female.
Identify the figure that illustrates ovulation and mention the stage of oogenesis it represents.
Which of the following enter the maturation phase of oogenesis?
Which of the following occurs during maturation phase of spermatogenesis?
Four primary spermatocytes give rise to ______.
______ undergoes 2nd meiotic division during spermatogenesis.
Which of the following events take place during spermatogenesis?
Middle piece of mammalian sperm possesses ______.
Sertoli cells are found in ______.
Which of the following stage of oogenesis forms a membrane called zona pellucida surrounding it?
Which of the following contains a fluid filled cavity called antrum?
Connective tissue around seminiferous tubules possess endocrine cells called ______.
Which among the following has 23 chromosomes?
Cells of corona radiata remain grouped together by ______.
Acrosome is a type of ______.
Penetration of the sperm in the ovum is followed by ______
Aquatic animals in which fertilisation occurs in water are said to be
Observe the given figure and answer the questions that follow.
- Label A and B.
- Identify the process.
- What happens during this process and what is formed?
The number of chromosome groups at the equatorial plate in metaphase-I of meiosis in a plant with 2n = 50 shall be:
Follicular atresia is:
In human females, meiosis II is not completed until:
