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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11. The character possessed by all sponges are
a) That all are fresh water
b) All possess tissue level of organization
c) External fertilization
d) Hermaphrodite

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12. Select the total number of statements belonging to sponges:
(1) Cellular level of organization.
(2) Body is supported by endoskeleton made up of spicules or sponging fibres.
(3) Larva stage is morphologically different from adult.
(4) Pathway of water transport is helpful in gathering of food, respiratory exchange and removal of waste.
(5) Hermaphrodite organism.
(6) They show the power of regeneration.
a) 5
b) 6
c) 4
d) 3

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13. Select the fresh water sponge from the following:
a) Sycon
b) Euspongia
c) Spongilla
d) Hyalonema

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14. Another name of sycon is
a) Scypha
b) Euspongia
c) Spongilla
d) Hyalonema

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15. Match the following:
Column I        Column II
A. Sycon     –     1. Bath sponge
B. Spongilla   –   2. Scypha
C. Euspongia   –   3. Fresh water sponge
a) A–2, B–3, C–1
b) A–1, B–2, C–3
c) A–3, B–2, C–1
d) A–3, B–1, C–2

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16. Select the total number of marine sponges from the following:
Leucosolenia, Euspongia, Spongilla, Sycon, Hyalonema
a) 3
b) 4
c) 5
d) 2

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17. The primitive multicellular animals having cellular level of organization are
a) Ctenophores
b) Sponges
c) Corals
d) Crustacean

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18. Water enters through minute pores in the body wall into central cavity in sponges. These minute pores are known as
a) Osculum
b) Ostia
c) Spongocoel
d) Any of the above

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19. In sponge, the sperm and ova are produced by the same individual. Such types of organisms are called
a) Asexual
b) Unisexual
c) Hermaphrodite
d) Dioecious

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20. Canal system and choanocytes are characteristic of
a) Ctenophora
b) Coelenterates
c) Platyhelminthes
d) Porifera

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