PrepBharat

1. Radial symmetry is shown by
a) Ctenophores
b) Coelenterates
c) Adult echinodermates
d) All of these

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2. The undifferentiated layer present between the ectoderm and endoderm in coelenterate is
a) Mesophyll
b) Gastral layer
c) Archenteron
d) Mesoglea

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3. Which of the following is correct about metamerism (true segmentation)?
a) Every organ shows serial repetition.
b) The body is divided externally as well as internally
c) Each segment is not supplied with separate nerve and blood vessels.
d) All of these

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4. In some animals, the body cavity is not lined by mesoderm. Instead the mesoderm is present as scattered pouches in between the ectoderm and endoderm. Such a body cavity is called
a) Eucoelom
b) Pseudocoelom
c) Acoelom
d) Any of the above

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5. The following are coelomates except (true coelom)
a) Annelida
b) Platyhelminthes
c) Mollusca
d) Chordata

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6. Select the total number of organism from the following which are sessile:
Amoeba, Euglena, Adamsia, Spongilla, Hydra, Jelly fish, Earthworm
a) 1
b) 2
c) 3
d) 4

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7. Which of the following is incorrect about Porifera?
a) It is a solitary or colonial organism
b) Majority live in sea and some live in fresh water
c) Most of them are asymmetric
d) All of the above

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8. Members of phylum Porifera are commonly known as
a) Flatworms
b) Roundworms
c) Sponges
d) Corals

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9. Water path in sponges is
a) Ostia → Spongocoel → Osculum
b) Osculum → Spongocoel → Osculum
c) Ostia → Spongocoel → Ostia
d) Spongocoel → Ostia → Osculum

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10. The unique character of sponges is
a) Choanocytes or collar cells line, the spongocoel and the canals
b) That they are hermaphrodite.
c) That they live in marine water.
d) It reproduces by asexual means only.

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