Question

1. Read the given statements and select the correct one 1) Both birds and reptiles have 10 pairs of cranial nerves 2) All tetrapods have four chambered heart 3) Cyclostomes are jawless fishes with cartilaginous endoskeleton 4) Mammals have well developed hepatic and renal portal systems ​

Answer 1

2 no is right option

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Answer 2

All tetrapods have four chambered heart is the correct option

Explanation:

Both birds and reptiles have 10 pairs of cranial nerves :

• Anamniotes (fish and amphibians) have 10 pairs of cranial nerves, while amniotes have 12 pairs (reptiles, birds and mammals). Olfactory, Optic, Occulomotor, Trochlear, Trigeminal, Abducens, Facial, Auditory, Glossopharyngeal, and Vagus are the cranial nerves of anamniotes.

All tetrapods have four chambered heart:

• Crocodiles and alligators (Order Crocodylia, Subclass Crocodylomorpha, Class Reptilia), birds (Subclass Aves, Class Reptilia), and mammals (Class Mammalia) were among the first tetrapods to develop a four-chambered heart.

Cyclostomes are jawless fishes with cartilaginous endoskeleton:

• There are no bones in the endoskeleton, which is cartilaginous. Throughout their lives, the notochord is present. There is no stomach in the digestive system. The nostril is solitary and located in the middle of the face.

Mammals have well developed hepatic and renal portal systems :​

• In fishes, amphibians, and reptiles, both hepatic and renal portal systems are present. In mammals, however, only hepatic portal systems are found.