Explanation:

B
Biradial symmetry and lack of cnidoblasts are the characteristics of Ctenoplana and Beroe.
- Biradial symmetry is a combination of radial and bilateral symmetry.
- Biradial symmetry is found in organism which shows morphological features of both bilateral and radial symmetry.
- Biradial organisms can only be cut along the two planes (longitudinal and transverse plane) equally.
- Ctenoplana is a marine solitary planktonic ctenophore. The ctenoplanidae family has only one genus, ctenoplana.
- Beroe cucumis has a transparent, sac like body, often somewhat compressed and reaches a maximum length of about $15 \mathrm{~cm}$.

Explanation:

C
Presence or absence of body cavity between the body wall and the gut wall is very important in classification. The body cavity which lined by mesoderm called coelome. Animals possessing coelome are called coelomates, e.g., annelids, mollusks, arthropods echinoderms, hemichordates and chordates. Schizocoelomates are invertebrate animal that possesses a schizocoel, a coelom, which is formed by the splitting of the mesodermal cell.
Enterocoelomates are animals in which coelom is lined by mesoderm which arise in the embryonic stage as an outpocketing of the developing gut. Hence, Schizocoelomates and Enterocoelomates are true
Flatworm are acoelomate animal.

Explanation:

C
The main characteristics of Deuterostomes include:-

- The anus is formed before the mouth
Radial, cleavage and the blastopore becoming anus.
- Mesoderm is formed from pockets of the gut
The main characteristics of Protostomes-
- A mouth that develops before the anus in embryos
- True tissue and are bilaterally symmetric
- Spiral determinate cleavage.

Explanation:

C
The matching set of a phylum-
1.Mollusca - Body is covered by Calcareous shell. Ex.Loligo, Teredo, Octopus
2.Annelida - Body is divided into segments that are separated by septa. Ex.- Bonellia
3.Cridaria or coelenterate-They are also known as cnidarians due to presence of cnidoblasts. Ex.Physalia, Aurelia, Pennatula
4.Platyhelminthes-They are mostly parasitic with a few free-living. Ex.- Planaria, Schistosoma
5.Nematoda-Their body has a cavity or pseudocoelom. Ex.- Enterobuis
6.Porifera-They have spongy appearance and attached to the substratum and do not move. Ex.- Spongilla, Euplectella

Explanation:

Explanation:

B
Biradial symmetry and lack of cnidoblasts are the characteristics of Ctenoplana and Beroe.
- Biradial symmetry is a combination of radial and bilateral symmetry.
- Biradial symmetry is found in organism which shows morphological features of both bilateral and radial symmetry.
- Biradial organisms can only be cut along the two planes (longitudinal and transverse plane) equally.
- Ctenoplana is a marine solitary planktonic ctenophore. The ctenoplanidae family has only one genus, ctenoplana.
- Beroe cucumis has a transparent, sac like body, often somewhat compressed and reaches a maximum length of about $15 \mathrm{~cm}$.

Explanation:

C
Presence or absence of body cavity between the body wall and the gut wall is very important in classification. The body cavity which lined by mesoderm called coelome. Animals possessing coelome are called coelomates, e.g., annelids, mollusks, arthropods echinoderms, hemichordates and chordates. Schizocoelomates are invertebrate animal that possesses a schizocoel, a coelom, which is formed by the splitting of the mesodermal cell.
Enterocoelomates are animals in which coelom is lined by mesoderm which arise in the embryonic stage as an outpocketing of the developing gut. Hence, Schizocoelomates and Enterocoelomates are true
Flatworm are acoelomate animal.

Explanation:

C
The main characteristics of Deuterostomes include:-

- The anus is formed before the mouth
Radial, cleavage and the blastopore becoming anus.
- Mesoderm is formed from pockets of the gut
The main characteristics of Protostomes-
- A mouth that develops before the anus in embryos
- True tissue and are bilaterally symmetric
- Spiral determinate cleavage.

Explanation:

C
The matching set of a phylum-
1.Mollusca - Body is covered by Calcareous shell. Ex.Loligo, Teredo, Octopus
2.Annelida - Body is divided into segments that are separated by septa. Ex.- Bonellia
3.Cridaria or coelenterate-They are also known as cnidarians due to presence of cnidoblasts. Ex.Physalia, Aurelia, Pennatula
4.Platyhelminthes-They are mostly parasitic with a few free-living. Ex.- Planaria, Schistosoma
5.Nematoda-Their body has a cavity or pseudocoelom. Ex.- Enterobuis
6.Porifera-They have spongy appearance and attached to the substratum and do not move. Ex.- Spongilla, Euplectella

Explanation:

Explanation:

B
Biradial symmetry and lack of cnidoblasts are the characteristics of Ctenoplana and Beroe.
- Biradial symmetry is a combination of radial and bilateral symmetry.
- Biradial symmetry is found in organism which shows morphological features of both bilateral and radial symmetry.
- Biradial organisms can only be cut along the two planes (longitudinal and transverse plane) equally.
- Ctenoplana is a marine solitary planktonic ctenophore. The ctenoplanidae family has only one genus, ctenoplana.
- Beroe cucumis has a transparent, sac like body, often somewhat compressed and reaches a maximum length of about $15 \mathrm{~cm}$.

Explanation:

C
Presence or absence of body cavity between the body wall and the gut wall is very important in classification. The body cavity which lined by mesoderm called coelome. Animals possessing coelome are called coelomates, e.g., annelids, mollusks, arthropods echinoderms, hemichordates and chordates. Schizocoelomates are invertebrate animal that possesses a schizocoel, a coelom, which is formed by the splitting of the mesodermal cell.
Enterocoelomates are animals in which coelom is lined by mesoderm which arise in the embryonic stage as an outpocketing of the developing gut. Hence, Schizocoelomates and Enterocoelomates are true
Flatworm are acoelomate animal.

Explanation:

C
The main characteristics of Deuterostomes include:-

- The anus is formed before the mouth
Radial, cleavage and the blastopore becoming anus.
- Mesoderm is formed from pockets of the gut
The main characteristics of Protostomes-
- A mouth that develops before the anus in embryos
- True tissue and are bilaterally symmetric
- Spiral determinate cleavage.

Explanation:

C
The matching set of a phylum-
1.Mollusca - Body is covered by Calcareous shell. Ex.Loligo, Teredo, Octopus
2.Annelida - Body is divided into segments that are separated by septa. Ex.- Bonellia
3.Cridaria or coelenterate-They are also known as cnidarians due to presence of cnidoblasts. Ex.Physalia, Aurelia, Pennatula
4.Platyhelminthes-They are mostly parasitic with a few free-living. Ex.- Planaria, Schistosoma
5.Nematoda-Their body has a cavity or pseudocoelom. Ex.- Enterobuis
6.Porifera-They have spongy appearance and attached to the substratum and do not move. Ex.- Spongilla, Euplectella

Explanation:

Explanation:

B
Biradial symmetry and lack of cnidoblasts are the characteristics of Ctenoplana and Beroe.
- Biradial symmetry is a combination of radial and bilateral symmetry.
- Biradial symmetry is found in organism which shows morphological features of both bilateral and radial symmetry.
- Biradial organisms can only be cut along the two planes (longitudinal and transverse plane) equally.
- Ctenoplana is a marine solitary planktonic ctenophore. The ctenoplanidae family has only one genus, ctenoplana.
- Beroe cucumis has a transparent, sac like body, often somewhat compressed and reaches a maximum length of about $15 \mathrm{~cm}$.

Explanation:

C
Presence or absence of body cavity between the body wall and the gut wall is very important in classification. The body cavity which lined by mesoderm called coelome. Animals possessing coelome are called coelomates, e.g., annelids, mollusks, arthropods echinoderms, hemichordates and chordates. Schizocoelomates are invertebrate animal that possesses a schizocoel, a coelom, which is formed by the splitting of the mesodermal cell.
Enterocoelomates are animals in which coelom is lined by mesoderm which arise in the embryonic stage as an outpocketing of the developing gut. Hence, Schizocoelomates and Enterocoelomates are true
Flatworm are acoelomate animal.

Explanation:

C
The main characteristics of Deuterostomes include:-

- The anus is formed before the mouth
Radial, cleavage and the blastopore becoming anus.
- Mesoderm is formed from pockets of the gut
The main characteristics of Protostomes-
- A mouth that develops before the anus in embryos
- True tissue and are bilaterally symmetric
- Spiral determinate cleavage.

Explanation:

C
The matching set of a phylum-
1.Mollusca - Body is covered by Calcareous shell. Ex.Loligo, Teredo, Octopus
2.Annelida - Body is divided into segments that are separated by septa. Ex.- Bonellia
3.Cridaria or coelenterate-They are also known as cnidarians due to presence of cnidoblasts. Ex.Physalia, Aurelia, Pennatula
4.Platyhelminthes-They are mostly parasitic with a few free-living. Ex.- Planaria, Schistosoma
5.Nematoda-Their body has a cavity or pseudocoelom. Ex.- Enterobuis
6.Porifera-They have spongy appearance and attached to the substratum and do not move. Ex.- Spongilla, Euplectella

Explanation:

Explanation:

B
Biradial symmetry and lack of cnidoblasts are the characteristics of Ctenoplana and Beroe.
- Biradial symmetry is a combination of radial and bilateral symmetry.
- Biradial symmetry is found in organism which shows morphological features of both bilateral and radial symmetry.
- Biradial organisms can only be cut along the two planes (longitudinal and transverse plane) equally.
- Ctenoplana is a marine solitary planktonic ctenophore. The ctenoplanidae family has only one genus, ctenoplana.
- Beroe cucumis has a transparent, sac like body, often somewhat compressed and reaches a maximum length of about $15 \mathrm{~cm}$.

Explanation:

C
Presence or absence of body cavity between the body wall and the gut wall is very important in classification. The body cavity which lined by mesoderm called coelome. Animals possessing coelome are called coelomates, e.g., annelids, mollusks, arthropods echinoderms, hemichordates and chordates. Schizocoelomates are invertebrate animal that possesses a schizocoel, a coelom, which is formed by the splitting of the mesodermal cell.
Enterocoelomates are animals in which coelom is lined by mesoderm which arise in the embryonic stage as an outpocketing of the developing gut. Hence, Schizocoelomates and Enterocoelomates are true
Flatworm are acoelomate animal.

Explanation:

C
The main characteristics of Deuterostomes include:-

- The anus is formed before the mouth
Radial, cleavage and the blastopore becoming anus.
- Mesoderm is formed from pockets of the gut
The main characteristics of Protostomes-
- A mouth that develops before the anus in embryos
- True tissue and are bilaterally symmetric
- Spiral determinate cleavage.

Explanation:

C
The matching set of a phylum-
1.Mollusca - Body is covered by Calcareous shell. Ex.Loligo, Teredo, Octopus
2.Annelida - Body is divided into segments that are separated by septa. Ex.- Bonellia
3.Cridaria or coelenterate-They are also known as cnidarians due to presence of cnidoblasts. Ex.Physalia, Aurelia, Pennatula
4.Platyhelminthes-They are mostly parasitic with a few free-living. Ex.- Planaria, Schistosoma
5.Nematoda-Their body has a cavity or pseudocoelom. Ex.- Enterobuis
6.Porifera-They have spongy appearance and attached to the substratum and do not move. Ex.- Spongilla, Euplectella

Explanation: