Phylum Chordata

Question 1

Sub-phylum vertebrata contain what classes ?

Answer 1

1. Chondrichthyes-cartilaginous fish(sharks)
2. Osteichthyes-bony fish(tuna)
3. Amphîbia (frogs)
4. Reptilia (snakes)
5. Mammalia(whales)

Question 2

How do vertebrates differ from other chordates?

Answer 2

• Have a skull that protects a well- developed brain .

* have a veteran column

Question 3

Difference between cartilaginous fish and bony fish ?

Answer 3

• cartilaginous lack opercular bones whereas bony has .

* homocercal tail in bony and heterocercal in cartilaginous

Question 4

General structure of amphibian

Answer 4

• skull wide,flat and light but strong .
• modified for large eyes
• no teeth at all or only on upper jaw
• numerous small teeth that are uniform and specialised

Question 5

Which two bones fused to form the wishbone ? Why?

Answer 5

The clavicle , to aid in flight muscle or defence

Question 6

What are the similarities between monotremes, marsupials and placentals ?

Answer 6

• The all have hair or fur covering their body
• homoiothermys
• four-chambered heart
• young are nourished with milk secreted by mothers mammalian gland.

Question 7

What are the differences between monotremes, marsupials and placentals ?

Answer 7

• monotremes- continue to lay eggs, pass urine,gametes,faeces through one opening
• marsupials-young in uterus for short period, born before embryonic development,live in pouch
• placentals- young developed fully in uterus

Question 8

What do all the sub-phyla have in common in feature s?

Answer 8

1. Notochord
2. Hollow dorsal
3. Pharyngeal pouches/gill slit
4. Have a tail which is posterior to anus