Assertion (A) Duck-bill platypus is a false mammal because it lays eggs.
Reason (R) True mammals are all viviparous hence duck-bill platypus are false mammals.
Important Questions on Classification
Which of the key adaptations helped evolutionary success of Reptiles on land?
A Warm-bloodedness
B. Pulmonary respiration and dry scaly skin
C. Internal fertilisation
D. Amniotic & Cleidoic eggs
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 |
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
Match the following
| List - I | List - II | ||
| (a) | Chelonia | (i) | Alligator |
| (b) | Rhynchocephalia | (ii) | Chameleon |
| (c) | Crocodilia | (iii) | Sphenodon |
| (d) | Squamata | (iv) | Testudo |
The correct answer is
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?
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
Forelimbs are modified into wings and hindlimbs are modified for walking and swimming.
Heart completely four-chambered.
They are homeotherms.
They are oviparous and development is direct.
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 |
Match the following columns and select the correct option:-
| Column-I | Column-II | ||
| (a) | Aptenodytes | (i) | Flying fox |
| (b) | Pteropus | (ii) | Angel fish |
| (c) | Pterophyllum | (iii) | Lamprey |
| (d) | Petromyzon | (iv) | Penguin |
