Class 12 Exam > Class 12 Notes > Test 1] Imp mcqs on only Porifera phylum [Neet /Aiims ]
Test 1] Imp mcqs on only Porifera phylum [Neet /Aiims ] - Class 12 PDF Download
1)Classification of Porifera is based on
A) branching
B) spicules
C) reproduction
D) symmetry
2)Water current in sponge/ leucosolenia is maintained by
A) pinacocytes
B) porocytes
C) Choanocyte
D) amoebocytes
3)a common chamber for all the canals of a sponge is
A) incurrent canal
B) paragastric cavity
C) excurrent Canal
D) radial Chamber
4)the simplest type of canal system in porifera is
A) askon type
B) leucon type
C) sycon
D) radial type
5)important trait of sponge is that all of them
A) reproduce sexually
B) containe choanocyte cell
C) contain coelenteron
D) herbivorous
6)thesocytes serve as
A) sex sells
B) Slime secreting cells
C) food reserve
D) embryonic cells
7)animals devoid of respiratory excretory and circulatory organs are
A) tapeworm
B) sponges
C) threadworms
D) live fluke
8)collar cells occur in
A) sponge B) Hydra
C) Sandworm
D) Starfish
9) nutrition in sponges is
A) extracellular
B) intracellular
C) first extracellular and then intracellular
D) first intracellular and then extracellular
10.)totipotent cells of sponges are
A) Thesocytes
B) Archeocytes
C) MYocytes
D) Cromocytes
Answer key....
1)B
2)C
3)B
4)A
5)B
6)C
7)B
8)A
9)B
10)B
A) branching
B) spicules
C) reproduction
D) symmetry
2)Water current in sponge/ leucosolenia is maintained by
A) pinacocytes
B) porocytes
C) Choanocyte
D) amoebocytes
3)a common chamber for all the canals of a sponge is
A) incurrent canal
B) paragastric cavity
C) excurrent Canal
D) radial Chamber
4)the simplest type of canal system in porifera is
A) askon type
B) leucon type
C) sycon
D) radial type
5)important trait of sponge is that all of them
A) reproduce sexually
B) containe choanocyte cell
C) contain coelenteron
D) herbivorous
6)thesocytes serve as
A) sex sells
B) Slime secreting cells
C) food reserve
D) embryonic cells
7)animals devoid of respiratory excretory and circulatory organs are
A) tapeworm
B) sponges
C) threadworms
D) live fluke
8)collar cells occur in
A) sponge B) Hydra
C) Sandworm
D) Starfish
9) nutrition in sponges is
A) extracellular
B) intracellular
C) first extracellular and then intracellular
D) first intracellular and then extracellular
10.)totipotent cells of sponges are
A) Thesocytes
B) Archeocytes
C) MYocytes
D) Cromocytes
Answer key....
1)B
2)C
3)B
4)A
5)B
6)C
7)B
8)A
9)B
10)B
FAQs on Test 1] Imp mcqs on only Porifera phylum [Neet /Aiims ] - Class 12
| 1. What are some common characteristics of organisms in the Porifera phylum? |  |
Ans. Organisms in the Porifera phylum, also known as sponges, possess several common characteristics. They are multicellular but lack true tissues and organs. Sponges have a porous body with numerous channels and chambers that allow water to flow through. They exhibit a sessile lifestyle, being attached to substrates such as rocks or coral reefs. Additionally, sponges possess specialized cells called choanocytes that help in filter-feeding.
| 2. How do sponges obtain their food? | |
Ans. Sponges are filter feeders, meaning they obtain their food by filtering small organic particles from the water. They achieve this through specialized cells called choanocytes, which have a flagellum surrounded by a collar of microvilli. The flagellum creates water flow, and the microvilli help in capturing food particles. As water flows through the sponge's body, choanocytes trap and ingest bacteria, plankton, and organic matter present in the water.
| 3. What is the role of spicules in sponges? | |
Ans. Spicules are structural elements found in sponges that provide support and protection. They are composed of various materials such as calcium carbonate, silica, or spongin. Spicules help maintain the sponge's shape and prevent it from collapsing under the force of water flow. They also deter predators by making the sponge less palatable or difficult to consume.
| 4. How do sponges reproduce? | |
Ans. Sponges have both sexual and asexual modes of reproduction. Asexual reproduction in sponges occurs through processes like budding, where a new sponge grows as an outgrowth from the parent sponge. Sexual reproduction involves the release of sperm and eggs into the water. Sponges are usually hermaphroditic, meaning individuals have both male and female reproductive organs. Sperm released by one sponge are captured by neighboring sponges and used to fertilize their eggs.
| 5. What is the ecological importance of sponges? | |
Ans. Sponges play a crucial role in marine ecosystems. They act as filter feeders, helping to maintain water quality by removing excess nutrients and particulate matter. Sponges provide habitat and shelter for a variety of small organisms, including fish, crustaceans, and other invertebrates. They also contribute to reef-building processes by accumulating calcium carbonate in their spicules, which aids in the formation of coral reefs. Additionally, sponges produce bioactive compounds that have potential pharmaceutical applications.
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