Human Reproduction
Important Terms
CBSE Class 12 - Biology
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| Male Reproductive System credits: Wikimedia under CC 3.0 |
Answer: It is the process of production of sperms by immature male germ cells that begins at puberty (Production of sperm).
Q2: Define Spermiogenesis
Answer: It is the process of transformation of spermatids into sperm.
Q3: What is spermiation?
Answer: It is the release of sperms from seminiferous tubule.
Q4: Define Oogenesis
Answer: The process of formation of a mature female gamete initiated during embryonic development.
Q5 Define Ovulation.
Answer: The process during which the Graafian follicle ruptures to release the secondary oocyte (ovum) from the ovary is called ovulation.
Q6: What is Menarche?
Answer: The first menstruation that begins at puberty is called menarche. It is starting of the first menstrual flow in females.
Q7: What is a Menstrual cycle?
Answer: It is the cycle of events starting from one menstruation till the next one after every 28 / 29 days.
Q8: Define Menopause
Answer: It is the cessation of menstrual cycle around 50 years of age.
Q9: Define gastrulation
Answer: It is a type of morphogenesis in which inner cell mass move into embryonic disk forming three germ layers i.e. ectoderm, mesoderm, and endoderm.
Q10: Define cleavage.
Answer: It is the mitotic division the zygote undergoes when it moves toward uterus and forms blastomeres.
Q11 What is Implantation?
Answer: It is embedding of the blastocyst in the endometrium of the uterus leads to pregnancy.
Q12 Define Parturition.
Answer: The vigorous contraction of the uterus at the end of pregnancy causing expulsion/delivery of the foetus (child birth)
Q13: What is Foetal ejection reflex?
Answer: These are the mild uterine contractions induced by the signals for parturition from the fully developed foetus and the placenta.
Q14 Define Lactation.
Answer: The process by which the mammary gland start producing milk is called lactation.
Q15: Write full for of the following acronyms:
ⅰ GnRH
ⅱ LH
ⅲ FSH
ⅳ hCG
ⅴ hPL
Answer:
ⅰ GnRH: Gonadotropin-releasing hormone
ⅱ LH: Luteinising hormone
ⅲ FSH: Follicle stimulating hormone
ⅳ hCG: Human chorionic gonadotropin
ⅴ hPL: Human placental lactogen
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