A In most simple type of canal system of Porifera, water flows through the following ways Ostia $\rightarrow$ Spongocoel $\rightarrow$ Osculum $\rightarrow$ Exterior. Water canal system is a characteristic feature of phylum porifera. The body of the poriferans have pores called ostia. The body has only one opening called the osculum. There is a continuous water movement from the exterior to the interior of the body of the poriferans. Water flows through the ostia into the spongocoel and goes out through the osculum. This helps in food gathering, exchange of gases and removed of waste.
WB JEE-2012
Animal kingdom
261554
Muscles in sponges are
1 striated
2 smooth
3 Both $[\mathrm{a}]$ and $[\mathrm{b}]$
4 None of these
Explanation:
D Sponges do not have muscular tissue; myocytes form fusiform contractile cells. They are able to contract without muscles. - They are animals of the phylum porifera. - They lack muscles, nerves and other internal organs. - Tubular cells (porocytes) makeup the pores into the sponge body through the mesophyl. - They have ascon, sycon and leucon type body.
Uttarakhand PMT-2011
Animal kingdom
261556
Power of regeneration of sponges is due to:
1 theocytes
2 archaeocytes
3 amoebocytes
4 sclerocytes
Explanation:
B Power of regeneration of sponges is due to archaeocytes. - Regeneration morphogenesis i.e. the ability to restore the lost parts by regeneration in sponges. - Archaeocytes are type of amoebocytes cells found in sponges. They are totipotent cell which can transforms into sclerocytes, spongocytes or collencytes.
AIIMS-2000
Animal kingdom
261558
Collar cells are characteristic of
1 earthworm
2 roundworms
3 coelenterata
4 sponges
Explanation:
D Collar cells are seen in the body wall of sponges. Collar cell/choanocytes are specialized cell consist of a flagellum, a collar and a nucleus. The collar of choanocytes contain various microvilli. Collar cell are chacteristic feature of the sponges.
A In most simple type of canal system of Porifera, water flows through the following ways Ostia $\rightarrow$ Spongocoel $\rightarrow$ Osculum $\rightarrow$ Exterior. Water canal system is a characteristic feature of phylum porifera. The body of the poriferans have pores called ostia. The body has only one opening called the osculum. There is a continuous water movement from the exterior to the interior of the body of the poriferans. Water flows through the ostia into the spongocoel and goes out through the osculum. This helps in food gathering, exchange of gases and removed of waste.
WB JEE-2012
Animal kingdom
261554
Muscles in sponges are
1 striated
2 smooth
3 Both $[\mathrm{a}]$ and $[\mathrm{b}]$
4 None of these
Explanation:
D Sponges do not have muscular tissue; myocytes form fusiform contractile cells. They are able to contract without muscles. - They are animals of the phylum porifera. - They lack muscles, nerves and other internal organs. - Tubular cells (porocytes) makeup the pores into the sponge body through the mesophyl. - They have ascon, sycon and leucon type body.
Uttarakhand PMT-2011
Animal kingdom
261556
Power of regeneration of sponges is due to:
1 theocytes
2 archaeocytes
3 amoebocytes
4 sclerocytes
Explanation:
B Power of regeneration of sponges is due to archaeocytes. - Regeneration morphogenesis i.e. the ability to restore the lost parts by regeneration in sponges. - Archaeocytes are type of amoebocytes cells found in sponges. They are totipotent cell which can transforms into sclerocytes, spongocytes or collencytes.
AIIMS-2000
Animal kingdom
261558
Collar cells are characteristic of
1 earthworm
2 roundworms
3 coelenterata
4 sponges
Explanation:
D Collar cells are seen in the body wall of sponges. Collar cell/choanocytes are specialized cell consist of a flagellum, a collar and a nucleus. The collar of choanocytes contain various microvilli. Collar cell are chacteristic feature of the sponges.
A In most simple type of canal system of Porifera, water flows through the following ways Ostia $\rightarrow$ Spongocoel $\rightarrow$ Osculum $\rightarrow$ Exterior. Water canal system is a characteristic feature of phylum porifera. The body of the poriferans have pores called ostia. The body has only one opening called the osculum. There is a continuous water movement from the exterior to the interior of the body of the poriferans. Water flows through the ostia into the spongocoel and goes out through the osculum. This helps in food gathering, exchange of gases and removed of waste.
WB JEE-2012
Animal kingdom
261554
Muscles in sponges are
1 striated
2 smooth
3 Both $[\mathrm{a}]$ and $[\mathrm{b}]$
4 None of these
Explanation:
D Sponges do not have muscular tissue; myocytes form fusiform contractile cells. They are able to contract without muscles. - They are animals of the phylum porifera. - They lack muscles, nerves and other internal organs. - Tubular cells (porocytes) makeup the pores into the sponge body through the mesophyl. - They have ascon, sycon and leucon type body.
Uttarakhand PMT-2011
Animal kingdom
261556
Power of regeneration of sponges is due to:
1 theocytes
2 archaeocytes
3 amoebocytes
4 sclerocytes
Explanation:
B Power of regeneration of sponges is due to archaeocytes. - Regeneration morphogenesis i.e. the ability to restore the lost parts by regeneration in sponges. - Archaeocytes are type of amoebocytes cells found in sponges. They are totipotent cell which can transforms into sclerocytes, spongocytes or collencytes.
AIIMS-2000
Animal kingdom
261558
Collar cells are characteristic of
1 earthworm
2 roundworms
3 coelenterata
4 sponges
Explanation:
D Collar cells are seen in the body wall of sponges. Collar cell/choanocytes are specialized cell consist of a flagellum, a collar and a nucleus. The collar of choanocytes contain various microvilli. Collar cell are chacteristic feature of the sponges.
A In most simple type of canal system of Porifera, water flows through the following ways Ostia $\rightarrow$ Spongocoel $\rightarrow$ Osculum $\rightarrow$ Exterior. Water canal system is a characteristic feature of phylum porifera. The body of the poriferans have pores called ostia. The body has only one opening called the osculum. There is a continuous water movement from the exterior to the interior of the body of the poriferans. Water flows through the ostia into the spongocoel and goes out through the osculum. This helps in food gathering, exchange of gases and removed of waste.
WB JEE-2012
Animal kingdom
261554
Muscles in sponges are
1 striated
2 smooth
3 Both $[\mathrm{a}]$ and $[\mathrm{b}]$
4 None of these
Explanation:
D Sponges do not have muscular tissue; myocytes form fusiform contractile cells. They are able to contract without muscles. - They are animals of the phylum porifera. - They lack muscles, nerves and other internal organs. - Tubular cells (porocytes) makeup the pores into the sponge body through the mesophyl. - They have ascon, sycon and leucon type body.
Uttarakhand PMT-2011
Animal kingdom
261556
Power of regeneration of sponges is due to:
1 theocytes
2 archaeocytes
3 amoebocytes
4 sclerocytes
Explanation:
B Power of regeneration of sponges is due to archaeocytes. - Regeneration morphogenesis i.e. the ability to restore the lost parts by regeneration in sponges. - Archaeocytes are type of amoebocytes cells found in sponges. They are totipotent cell which can transforms into sclerocytes, spongocytes or collencytes.
AIIMS-2000
Animal kingdom
261558
Collar cells are characteristic of
1 earthworm
2 roundworms
3 coelenterata
4 sponges
Explanation:
D Collar cells are seen in the body wall of sponges. Collar cell/choanocytes are specialized cell consist of a flagellum, a collar and a nucleus. The collar of choanocytes contain various microvilli. Collar cell are chacteristic feature of the sponges.
