ZOL1501 S1 Ass no
DEPARTMENT OF LIFE AND CONSUMER SCIENCES
Animal Diversity I
ZOL1501
Semester I: Assignment no.: 01 MEMO
2014
QUESTION 1
[10]
a. Monophyletic group is a group that includes the most recent common ancestor of a group of organisms, and all of its descendants.
b. Parthenogenesis is a unisexual reproduction involving the reproduction of young by females not fertilized by males.
c. Metamerism is a condition of being composed of serially repeated parts (metameres). Serial segmentation. Metamerism is a division of the body into discrete segments or metameres.
d. Epitoke posterior part of a marine polychaete when swollen with developing gonads during the breeding season.
e. Peritoneum is the membrane that lines the coelom and covers the coelomic viscera.
QUESTION 2
[16]
2.1 Encystment is a process of cyst formation. Dormant forms marked by resistant external cover and a complete shutdown of metabolic machinery. This process of escape from a cyst, a stage in the life cycle of parasites occurring after the cystic form has been ingested by the host organism. Cyst formation is important to parasitic forms that that must survive a harsh environment between hosts. Such harsh conditions include food deficiency, desiccation, increased environmental osmotic pressure, decrease oxygen concentration, and a change in pH or temperature. Encystment in the protozoan is enclosed in or as if in a cyst, thick membrane, or shell. Excystment is the escape from cysts, a return of favourable conditions initiates excystment for those protozoa in which the cysts are resistant stage.
(6)
2.2 Students should elaborate this from the prescribed textbook.
-Lobopodia are blunt-tipped.
-Filipodia are thin and sharply pointed.
-Rhizopodia are branched filaments.
-Reticulopodia are branched filaments that merge to form a netlike structure.
-Axopodia are thin, pointed pseudopodia that contain a central longitudinal filament of microtubules. QUESTION 3
(10)
[26]
3.1 Biradial symmetry is a type of
Animal Diversity I
ZOL1501
Semester I: Assignment no.: 01 MEMO
2014
QUESTION 1
[10]
a. Monophyletic group is a group that includes the most recent common ancestor of a group of organisms, and all of its descendants.
b. Parthenogenesis is a unisexual reproduction involving the reproduction of young by females not fertilized by males.
c. Metamerism is a condition of being composed of serially repeated parts (metameres). Serial segmentation. Metamerism is a division of the body into discrete segments or metameres.
d. Epitoke posterior part of a marine polychaete when swollen with developing gonads during the breeding season.
e. Peritoneum is the membrane that lines the coelom and covers the coelomic viscera.
QUESTION 2
[16]
2.1 Encystment is a process of cyst formation. Dormant forms marked by resistant external cover and a complete shutdown of metabolic machinery. This process of escape from a cyst, a stage in the life cycle of parasites occurring after the cystic form has been ingested by the host organism. Cyst formation is important to parasitic forms that that must survive a harsh environment between hosts. Such harsh conditions include food deficiency, desiccation, increased environmental osmotic pressure, decrease oxygen concentration, and a change in pH or temperature. Encystment in the protozoan is enclosed in or as if in a cyst, thick membrane, or shell. Excystment is the escape from cysts, a return of favourable conditions initiates excystment for those protozoa in which the cysts are resistant stage.
(6)
2.2 Students should elaborate this from the prescribed textbook.
-Lobopodia are blunt-tipped.
-Filipodia are thin and sharply pointed.
-Rhizopodia are branched filaments.
-Reticulopodia are branched filaments that merge to form a netlike structure.
-Axopodia are thin, pointed pseudopodia that contain a central longitudinal filament of microtubules. QUESTION 3
(10)
[26]
3.1 Biradial symmetry is a type of