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Phylum Chordata

“All vertebra...

Question

“All vertebrates are chordates but all chordates are not vertebrates”. Justify the statement.

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Solution

The characteristic features of the phylum, Chordata, include the presence of a notochord and paired pharyngeal gill slits. In sub-phylum Vertebrata, the notochord present in embryos gets replaced by a cartilaginous or bony vertebral column in adults. Thus, it can be said that all vertebrates are chordates but all chordates are not vertebrates.

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Q. All vertebrates are chordates but all chordates are not vertebrates. Justify the statement.

Q. Which of the following statements are true for phylum Chordata?
a. In cephalochordates, notochord extends from head to tail and it is present throughout their life
b. All vertebrates are chordates but all chordates are not vertebrates
c. Central neural system is dorsal and solid
d. Chordates are divided into two subphyla, Agnatha and Gnathostomata

Chordates which possess backbone are called__(vertebrates/invertebrates).

Q. Give scientific reasons.
a. Though tortoise lives on land as well as in water, it cannot be included in class- Amphibia.
b. Our body irritates if it comes in contact with jelly fish.
c. All vertebrates are chordates but all chordates are not vertebrates.
d. Balanoglossus is connecting link between non-chordates & chordates.
e. Body temperature of reptiles in not constant.

Q. In some chordates, the notochord is modified as the vertebral column, such animals are called vertebrates. Which of the following statements make sense?

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