Phylum Ctenophora: General Characters and Classification Multiple Choice questions: NEET
Defination : Ctenophora are marine zooplankton invertebrate and called as sea gooseberries.
🌑General features
🔴Ctenophores are commonly known as sea walnuts or combe Jellies
🔴They are exclusively marine.
🔴They are Diploblastic,radially symmetrical, Acoelomate organisms with tissue level of organisation.
🔴The body bears eight external rows of ciliated comb plates which help in locomotion.
🔴 Digestion is both extracellular and intracellular.
🔴Bioluminescence is the property of a living organism to emit light, well-marked in ctenophores.
🔴Sexes are not separate therefore they are Monoecious
🔴Reproduction takes place only by sexual mode.Development is indirect.
🔴Fertilisation is external with indirect development.
🌑Examples of Ctenophora
🔴It is commonly called as sea gooseberries.
🔴It is a pelagic animal caught in coastal area but some time it is present in intertidal zone. It is widely distributed in all over the world.
🔴It has two tentacles which are long it's length of body.
🔴This ctenophora does not show Bioluminesence but has some shining effect.
🔴It uses Eight row of comb plate for the movement.
🔴It is hermaphrodite and has both male and female reproductive organ
🔴It does not has nematocyst has special cell colloblast for the attachment.
🔴It is commonly called as sea walnut.
🔴It has reduced nervous system including non polar neurons without synapsis.
🔴It has two tentacles which are long it's length of body.
🔴Ctenoplana show Bioluminescence and it glow in dark.
🔴It uses Eight row of comb plate for the movement.
🔴It is hermaphrodite and has both male and female reproductive organ
🔴It does has special cell colloblast which release stick material to catch the prey.
3. Ctenophora are also known as
A. Animals are Monoecious.
B. They reproduce only by sexual means.
C. They have eight row of comb plate for locomotion.
D. Aurelia is a Ctenophora and commonly called as Jelly fish.
A. Balanoglossus and Saccoglossus
B. Obelia and Aurelia
C. Pleurobrachia and Ctenoplana
D. Neophron and Pteropus
Answer : C
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