Chordates
Chordates: Overview
This Topic covers sub-topics such as Chameleon, Ornithorhynchus, Vertebral Column, Salamander, Hippocampus, Phylum Chordata, Catla, Scoliodon, Petromyzon, Class Amphibia, Class Chondrichthyes, Branchiostoma, Cephalochordata, Urochordata and, Agnatha
Important Questions on Chordates
The normal temperature of human body on the Kelvin scale is
What is true about Nereis, scorpion, cockroach and silver fish?
Gambusia fish has been introduced in lakes and ponds of India to control a deadly disease. It feeds on larva of
Which of the following does not come under the class mammals?
All mammals without any exception are characterized by
Which one of the following animals is correctly matched with its one characteristic and the taxon?
Animals belonging to the phylum Chordata are fundamentally characterised by the presence of
The long bones are hollow and connected by air passage. They are characteristic of
Assertion: Birds have one ovary.
Reason: This reduces the body weight for flight.
Assertion: The duck-billed Platypus and the spiny ant-eater both are egg-laying animals, yet they are grouped under mammals.
Reason: Both of them have seven cervical vertebrae and 12 pairs of cranial nerves.
Assertion: Acraniata is a group of organisms which do not have distinct cranium.
Reason: It includes small marine forms.
Select the correct statement related to chordates.
A. Presence of a mid-dorsal, solid and double nerve cord.
B. Presence of closed circulatory system.
C. Presence of paired pharyngeal gillislits.
D. Presence of dorsal heart
E. Triploblastic pseudocoelomate animals.
Choose the correct answer from the options given below:
Which of the following represents the correct combination without any exception?
| Characteristics | Class | |
| 1 | Mouth ventral, gills without operculum; skin with placoid scales; persistent notochord | Chondrichthyes |
| 2 | Sucking and circular mouth; jaws absent; integument without scales; paired appendages | Cyclostomata |
| 3 | Body covered with feathers; skin moist and glandular; fore-limb forms wings; lung with air sacs | Aves |
| 4 | Mammary gland; hair on body; two pairs of limbs | Mammalia |
