True coelom appeared first in the course of evolution in
Aschelminthes
Chordata
Echinodermata
Annelida
D.
Annelida
Phylum Annelida shows evidence for first true coelomates. Species belonging to annelida eg. Nereis, hirudinaria etc. Show presence of all three germ layers viz. Ectoderm, Endoderm and Mesoderm. The cavity (coelom) is lined by the cells of Mesoderm. Annelids are schizocoelomates. Mesoderm splits and forms the schizocoelom. In schizocoelomates the opening of the embryonic gut first develops into mouth and later forms the anus.
During photosynthesis
both CO2 and water get oxidized
both CO2 and water get reduced
water is reduced and CO2 is oxidized
CO2 gets reduced and water gets oxidized
The order of occurrence of the cytochromes in the F1 particle is
cyt-b, cyt-c, cyt-a-cyt a3
cyt-c, cyt-b, cyt-a-cyt a3
cyt-a, cyt-b, cyt-c-cyt a3
cyt-a3, cyt-a, cyt-c-cyt b
Tube-within-a-tube body plan is shown by
coelenterates
platyhelminthes
aschelminthes (nemathelminthes)
porifers
The cell organelles are found in
bacterial cells
cyanobacterial cells
prokaryotic cells
eukaryotic cells
Intracellular compartments are not found in the cells of
lower plants
prokaryotes
higher plants
eukaryotes
