Biology

Comparison between chordates and non-chordates

Chordates	Non-chordates
1. Notochord is present at least in some stage of life cycle	Notochord is absent
2. Nerve cord is non-ganglionated, single, dorsal and hollow	Nerve cord is ganglionated, double ventral and solid
3. Pharyngeal gill slits are present	Absent
4. A post anal tail is present in some stages or throughout life	Post anal tail is absent
5. Ventral heart is present	Dorsal heart is present
6. Haemoglobin is present in RBC	Haemoglobin when present is in the blood plasma
7. Endoskeleton and exoskeleton are present	Generally exoskeleton alone is present
8. Hepatic portal system is present	Hepatic portal system absent
9. Eyes are derived from brain	Eyes are derived from the skin
10. Blood flow is forward in ventral vessel and backward in dorsal vessel	Blood flow is back ward in ventral vessel and forward in dorsal vessel

- Three Domains - Detailed Description
Bacteria (eubacteria) Archaea Eukarya Most bacteria (formerly monerans) Methanogens Protista Thermophiles Fungi Halophiles Animalia Plantae FEATURE ...

- Animal Kingdom: Model Questions
Animal Kingdom: Model Questions 1.       An animal shows the following characters:·      Body is dorso-ventrally flattened·      Parenchyma cells are found between the body...

- Comparison Of Different Types Of Muscles
Striated (skeletal) muscles Non-striated (smooth or visceral) muscles Cardiac muscles 1.        Striations present Absent Absent 2.        Voluntary in action Involuntary...

- Comparison Between Flying Birds And Flightless Birds
Flying birds (Carinatae) Flightless birds (Ratitae) 1.         Usually small in size Usually large in size 2.         Well developed wings Poorly developed wings...

- Comparison Between Lizards And Snakes
Lizards Snakes 1.        Slightly compresed body Cylindrical body 2.        Two pairs of limbs Limbs are absent 3.        Exoskeleton...

Biology