Axolotl larva of Ambyostoma normally fails to metamorphose due to:
Important Questions on Animal Kingdom
Which of the following statements are true for the phylum-Chordata?
(a) In Urochordata, notochord extends from head to tail, and it is present throughout their life.
(b) In Vertebrata, the notochord is present during the embryonic period only.
(c) Central nervous system is dorsal and hollow.
(d) Chordata is divided into 3 subphyla: Hemichordata, Tunicata, and Cephalochordata.
Statement (S) : The amphibian blood is composed of erythrocytes, leucocytes and thrombocytes. The thrombocytes help in haemostasis.
Reason (R): The haemostasis regulates the body temperature in poikilotherms.
Which of the following is true?
Observe the following simplified scheme and choose the correct option that matches with the letters given in the boxes.
Study the following and pick up the correct combinations.
| S.No | Class | Unique character | Flourished in |
| I) | Amphibia |
Buccopharyngeal respiration |
Carbonferous period |
| II) | Reptilia | Jacobson organs | Mesozoic era |
| III) | Mammalia | Pinna | Coenozoic era |
| IV) | Pisces | Meninx primitiva | Cretaceous period |
Statement I: Sternum appeared for the first time in amphibians.
Statement II: Snakes have pairs of cranial nerves.
The correct option among the following is
a) Chondrichthyes have gill slits covered by operculum and Osteichthyes have gill slits without operculum
b) Chondrichthyes have a swim bladder and Osteichthyes do not have a swim bladder
c) Chondrichthyes contain placoid scales and Osteichthyes contain cycloid scales
d) Chondrichthyes contain terminal mouth and Osteichthyes contain ventral mouth
Identify the wrongly matched Scientific and common name:
| Scientific name | Common name |
| a) Bungarus | Krait |
| b) Exocoetus | Flying fish |
| c) Trygon | Electric ray |
| d) Carcharodon | Dogfish shark |
| e) Myxine | Hagfish |
Match the following
| List - I | List - II | ||
| (a) | Each half of the lower jaw is formed by 6 bones | (i) | Aves |
| (b) | Lacrimal and Harderian glands appeared for the first time | (ii) | Reptiles |
| (c) | Presence of only right systemic arch | (iii) | Amphibians |
| (d) | Each half of the lower jaw is made of single bone | (iv) | Mammals |
Name the classes of Tetrapoda that exhibit the following characters:
| Column (A) | Column (B) |
| Acrodont | Thecodont |
| pairs cranial nerves | pairs cranial nerves |
| Cold-blooded | Warm-blooded |
| Amphicoelous vertebrae | Amphiplatyan vertebrae |
