Subphylum Cephalochordata

Q. In both Urochordata and Cephalochordata, the notochord is present at the tail region only.

1. False
2. True

Q. Which of the following is true about sub-phylum Cephalochordata?

1. Notochord is present only in larval tail
2. Notochord is replaced by a vertebral column in the adult
3. Notochord extends from head to tail
4. They are also called tunicates

Q.

Give an example for each of the following :
Cephalochordata

Q. Which of the following given characteristics is wrong about Amphioxus?

1. Its pharynx is very large and contains gill-slits.
2. It is a small, fish-like, marine animal.
3. Amphioxus is a unisexual organism.
4. Notochord is present in only tail region of larvae.

Q. Match the following.

$\begin{array}{cc}Subphylum& Characteristic\\ \text{(1) Vertebrata}& \text{(A) Notochord present throughout the body}\\ \text{(2) Urochordata}& \text{(B) Notochord replaced by a vertebral column}\\ \text{(3) Cephalochordata}& \text{(C) Notochord present only at tail region}\end{array}$

1. Cephalochordata
2. Urochordata
3. Vertebrata
4. Craniata