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WorksheetsCHAPTER 9 REPRODUCTION (9.3 AND 9.4)
Total questions: 35
Worksheet time: 35mins
Name the process when a sperm meets and fuses with an ovum to form a zygote.
Fertilisation
Fusion
Conception
Implantation
Where does fertilization occur?
The uterus
The oviduct
The ovary
Tick the stages of fertilisation
Capcitation
Acrosomal reaction
Fusion of sperm's head and oocyte's plasma membrane
Cortical reaction
The stage where sperms gain its enhanced mobility is
Capacitation
Cortical reaction
Acrosomal reaction
Fusion
Following the fusion of sperm's head with oocyte's plasma membrane...
The other half of chromosomal sets are released into oocyte.
Meiosis is completed.
Na+ is released from oocyte's endoplasmic reticulum
Increase in Ca2+ which later trigger cortical reaction
In cortical reaction..
Zona pellucida hardens, prevent penetration of other sperms
Receptors for sperm binding on oocytes are cleaved off
Granulosa cells thickened, prevent sperms entry
Oocyte's membrane because non-permeable
These are the consequence of fertilisation, except.
Restoration of ploidy number (2n)
Determination of the sex of the embryo
Reconstruction of multicellular state
Termination of embryo's developmental programme
What are the three main stages of embryogenesis?
Cleavage
Proliferative
Gastrulation
Organogenesis
These two are present during cleavage stage of embryo.
Morula
Blastula
Neurula
Gastrula
The three germ layers formed during _________ stage.
Neurula
Gastrula
Blastula
Organula
These organs rise from ectoderm layer, except
Skin
Brain
Spinal cord
Muscles
These systems are originated from mesoderm layer, except
Sensory system
Skeletomuscular system
Circulatory system
Lymphatic system
Endoderm give rise to..
Epithelial lining of excretory organs
Liver and pancrease
Epithelial lining of guts
epithelial of the skin
Which hormone is inhibited during pregnancy in order to prevent contractions of the uterus?
Oxtytocin
Progesterone
Estrogen
FSH
What does the blastocyst secrete?
HCG
Estrogen
Progesterone
ADH
What helps to prevent polyspermy?
The contraceptive pill
The unequal division of oocytes
The placental barrier
The cortical reaction
What helps to prevent polyspermy?
The contraceptive pill
The unequal division of oocytes
The placental barrier
The cortical reaction
Which hormone critical for the maintenance of corpus luteum following the implantation of blastocyst?
human chronic gonadotropin
human chorionic gonadotropin
human chorionic gonadotrophin
human chorionic gonatotropin
What would happen if corpus luteum is not maintained following implantation of embryo?
miscarriage
preterm birth
follicle development
organogenesis cannot happen
These are the functions of estrogen during pregnancy.. except..
critical for organ development of the fetus
increase the expression of oxytocin receptor on myometrium
inhibit prolactin and oxytocin
prepare the myometrium for parturition by increasing its sensitivity to oxytocin
Tick all correct answers.
During birth;
Oxytocin released from fetus and mother's posterior p. gland stimulates uterine contraction
Oxytocin stimulates placenta to make prostaglandin which further enhance uterine contraction
Contraction stimulates more oxytocin and prostaglandin secretion
What is the biggest player that induces parturitions?
Drops of progesterone and rise of estrogen
Drops of progesterone and estrogen
Rise of progesterone and drops of estrogen
Rise of both progesterone and estrogen
Why do you think a female passes her gestation periods and deliver her baby later than scheduled?
Progesterone level is still high
Estrogen level is still high
Progesterone level is still low
Estrogen level is still low
Which of these hormones is critical for milk production?
Prolactin
Oxytocin
Estrogen
Progesterone
How can suckling of a baby to his/her mother's breast could save her mother's life following delivery? Tick all relevant answers.
Promotes more oxytocin release
Promotes more uterine contraction
Constriction of ruptured bloods vessels occurs more
Prevent excessive bleeding
