Which of the following animals is an example of a urochordate?
Ascidia is a urochordate, where the notochord is present only in the larval stage.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Vertebrata - Cyclostomata and Pisces
#chordates
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Which of the following is an example of a cephalochordate?
Branchiostoma (also known as Amphioxus) is a cephalochordate characterized by the presence of a notochord throughout life.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Vertebrata - Cyclostomata and Pisces
Which of the following characteristics is found in all chordates?
All chordates possess a dorsal hollow nerve cord at some stage in their life cycle.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Vertebrata - Cyclostomata and Pisces
Which feature in chordates aids in respiration during early development?
Pharyngeal gill slits are present in chordates during early development and aid in respiration in aquatic forms (NCERT, Chapter 4, page 55). Lungs are in terrestrial vertebrates, tracheae and spiracles in arthropods.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Vertebrata - Cyclostomata and Pisces
Which structure in hemichordates is functionally similar to the notochord?
The stomochord in hemichordates is a rod-like structure that functions similarly to the notochord.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Hemichordata and Chordata - Protochordata
Which of the following statements about hemichordates is incorrect?
Hemichordates have a stomochord, which is similar in function but not homologous to the notochord.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Hemichordata and Chordata - Protochordata
Which feature is present in all chordates at some stage of their life cycle?
All chordates possess a notochord at some stage, which provides structural support.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Hemichordata and Chordata - Protochordata
Which of the following statements about hemichordates is incorrect?
Hemichordates do not have a true notochord; instead, they possess a stomochord, which is similar in function.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Hemichordata and Chordata - Protochordata
Which chordate feature is replaced by the vertebral column in vertebrates?
The notochord is replaced by the vertebral column in vertebrates during development (NCERT, Chapter 4, page 56). Other chordate features persist in modified forms.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Hemichordata and Chordata - Protochordata
Which characteristic feature differentiates Urochordata from Cephalochordata?
In Urochordates (e.g., Ascidia), the notochord is present only in the larval stage, whereas in Cephalochordates (e.g., Branchiostoma), it is present throughout life.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Hemichordata and Chordata - Protochordata
Which structure in chordates supports the body during early development?
The notochord is a flexible rod-like structure that supports the body in chordates during early development (NCERT, Chapter 4, page 55). The vertebral column replaces it in vertebrates, the spinal cord is the nerve cord, and the hemocoel is in arthropods.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Hemichordata and Chordata - Protochordata
Which of the following structures is present in chordates during embryonic development?
All chordates possess a dorsal hollow nerve cord at some stage of their development.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Mollusca and Echinodermata