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class of crustacea - branchiurabranchiura involves only around 130 species of ectoparasitic crustaceans living mostly on the integument and gill
class of crustacea - copepodacopepoda is a huge class of small 1-5mm crustaceans occupying both marine and freshwater environments copepods form the
class pycnogonida of phylum arthropodameasures generally 3-4 mm body chiefly made up of cephalothorax abdomen being very small generally four pairs
class arachnida of phylum arthropodabody divided into cephalothorax and abdomen cephalothorax along with four 4 pairs of legs abdomen segmented or
subphylum trilobitomorphasubphylum trilobitomorpha involves the trilobites all species are extinct and the fossils point out that they were all
characteristic features of phylum arthropoda well-developed muscular system along with striated muscles attached to the exoskeleton and visceral
phylum arthropoda - classification of multicellular animalsearlier you known how the coelom evolved and the body of the coelomates got segmented
class hirudinea - classification of coelomthese are leeches number of body segments of these types of animals is fixed usually there are 34 segments
class polychaeta - classification of coelomthere are mainly marine forms with distinct head having eyes and tentacles segments have lateral
characteristic features of coelom sensory system consisting of eyes photoreceptor cells statocysts taste buds and tactile organs respiration by skin
metamerism oe segmentation in the early coelomates the coelom was not divided into segments the whole body cavity was a single space hence body
classification of multicellular animals - coelom we know earlier that the pseudocoel gave animals specific selective benefits among other things this
defects in human development1 for instance when a pregnant woman drinks alcohol her embryo is exposed to similar concentration of alcohol as is in
flaws in developmen of human the human growth and development in spite of its complexity works perfectly most of the time but while development goes
placenta - human developmentwe had said previous in the unit that in the second week of development a primitive uteroplacental circulation is
extra-embryonic membranes and placenta the extra embryonic membranes like you already know provide nourishment and protection these membranes are
embryonic development the embryonic stage extends from the second week by the 8th week and is charactrised by formation of placenta the development
implantation - pre-embryonic developmentafter entering the uterus and formation of icm the blastocyst starts to embed in the endometrium of the
pre-embryo - human developmentabout thirty hours after fertilization the zygote goes through mitosis giving rise to 2 blastomeres these blastomeres
vitro fertilization - human developmentin case a woman cannot conceive due to her uterine tubes are blocked she can become pregnant by means of in
fertilization - pre-embryonic developmentovulation generally takes place between 9th to 14th day after the end of last menstrual period fertilization
pre-embryonic development we had said in the starting of the unit that prenatal development can be divided into two phases embryonic and foetal the
respiratory system - developmental changes after birththe new-borns lungs are collapsed and need powerful breaths to inflate them airways too are
spermatogenesis - gametogenesisthe procedure of maturation of spermatogonia into sperms starts at puberty about 14 years and continues into old age
gametogenesis - human developmentgametogenesis as you are responsive is the process of formation and development of specialized reproductive cells