All vertebrates are chordates but all chordates are not vertebrates, why?
1. | Notochord is replaced by a vertebral column in the adults of some chordates. |
2. | The ventral hollow nerve cord remains throughout life in some chordates. |
3. | All chordates possess a vertebral column. |
4. | All chordates possess notochords throughout their lives. |
1. | include amphibians, reptiles, birds, and mammals |
2. | are especially well adapted for fresh water |
3. | have physiological mechanisms for conserving water |
4. | typically excrete ammonia |
5. | gave rise to the amphibians |
Choose the correct statement.
1. | All mammals are viviparous |
2. | All cyclostomes do not possess jaws and paired fins |
3. | All reptiles have a three-chambered heart |
4. | All Pisces have gills covered by an operculum |
Which of the following statements are true for the phylum-Chordata?
(a) | In Urochordata, notochord extends from head to tail and is present throughout their life |
(b) | In Vertebrata, notochord is present during the embryonic period only |
(c) | Central nervous system is dorsal and hollow |
(d) | Chordata is divided into 3 sub-phyla : Hemichordata, Tunicata and Cephalochordata |
1. (c) and (a)
2. (a) and (b)
3. (b) and (c)
4. (d) and (c)
Consider the following features:
A: | Organ system level of organisation |
B: | Bilateral symmetry |
C: | True coelom with segmentation of body |
Select the correct option of animal groups that possess all the above characteristics:
1. | Annelida, Mollusca and Chordata |
2. | Annelida, Arthropoda and Chordata |
3. | Annelida, Arthropoda and Mollusca |
4. | Arthropoda, Mollusca and Chordata |
I: | possess a jaw |
II: | have a cartilaginous endoskeleton |
1. | Only I is correct |
2. | Only II is correct |
3. | Both I and II are correct |
4. | Both I and II are incorrect |
I: | an endodermally derived rod-like structure. |
II: | formed on the dorsal side during embryonic development in some animals. |
Column I | Column II | ||
A | Branchiostoma | P | Notochord persisting in adult |
B | Ascidia | Q | Notochord present only in larval tail |
C | Pristis | R | Cartilaginous endoskeleton |
D | Catla | S | Bone endoskeleton |
A | B | C | D | |
1. | P | Q | R | S |
2. | P | Q | S | R |
3. | Q | P | R | S |
4. | Q | P | S | R |
I: | are marine but migrate for spawning to fresh water. |
II: | die within a few days of spawning. |