Biology Questions and Answers
The vacuoles of protozoans are internal
structures sthat when necessary liberate pecialized in water water tostorage
the cytoplasm. Vacuoles thus can dilute
the cytoplasm foosmotic equilibrium with thr it to enter intoe
environment. Protozoans of fresh water
then need vacuoles mintracellular is hypertonic in ore sincrelation toe their (^)
the exterior. Without the dilution
mechanism prprotozoans of fresh water wovided by the vacuolould absorbes, (^)
too much water and would die.
- Do protozoans have sexual
or asexual reproduction?
In protozoans reproduction is sexual or
asexual. The most fsexual reproduction is birequent form ofnary division, (^) or
scissiparity,itself by mitosis in which th originatine cell divig two des
daughter cells. Some species, like the
plasmodium, areproduce asexually bgent of malaria,y schizogony (^)
(multiple fission); in this form of
reproduction the cell becomesmultinucleated, generally inside (^) a host
cell, and each nucleus is expelled out
together with cytoplasm prise to new protozoans. ortions giving
The sexual rcan happen by conjugation, eproduction in protozoanswith
incorporation of genetic material from
one cell into athat fecundate otnother, or by gameteshers and form zygotes. (^)
In the plasmodium sexual reproduction
happens in the mosqhost, and the zygote undergoes mitosisuito, the definitive (^)
(sporogony) creating many sporozoites.
- Which is the form of
protozoan reproduction that
generates more variability?
Sexual remore genetic variabilityproduction always g than asexeneratesual
reproduction.reproduction the fusion of genetic That is because in sexual
material from different individuals
occurs ageneticallynd so the offspring is not identical to the parent cell.
If the hypothesisoriginated multicellular a that protozoansnimals is (^)
strong, other hypotheses may bstronger: that these protozoans we evenere
able to reproduce sexually, since only
genetic variationdifferentiation to the can produce biologicalpoint of creating
new types of living beings.
- What are the four groups
of protozoans?
The four main groups of protozoans are
the sarcodinlike amoebae), the mastigophes (that form pseudopods,ores
(flagellated, like the trypanosome that
causes C(like paramecia) and the sporozhagas’ disease), the ciliatedoans
(spore-forming, like plasmodia). - Why are euglenas involved
in polemics related to their
taxonomic classification?
Euglenas are involved in taxonomic
polemicsclassified som because they tend to beetimes as protozoans an (^) d
sometimes as algae. Although they have
chloroplasts and they are photosynthetic
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