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Given below are some general characters ...

Given below are some general characters of a chordate .
(A) skin is dry without glands, except oil gland at the base of the tail.
(B) warm-blooded (homeothermic) animal.
(C) The heart is completely four-chambered with right systemic arch.
(D) The digestive tract has additional chambers , the crop and gizzard .
Identify the animal on the basis of these characters.

A

Ichthyophis

B

Crocodilus

C

Columba

D

Macropus

Text Solution

AI Generated Solution

The correct Answer is:
To identify the animal based on the given characteristics, we will analyze each character step by step. ### Step 1: Analyze the Skin Character - The first character states that the skin is dry without glands, except for an oil gland at the base of the tail. - This characteristic is typical of birds, as they have dry skin covered with feathers and possess a preen gland (oil gland) at the base of their tail. **Hint:** Think about animals with feathers and dry skin. ### Step 2: Analyze the Temperature Regulation - The second character mentions that the animal is warm-blooded (homeothermic). - Birds are warm-blooded, meaning they can maintain a constant body temperature regardless of the environment. **Hint:** Consider animals that can regulate their body temperature internally. ### Step 3: Analyze the Heart Structure - The third character describes a heart that is completely four-chambered with a right systemic arch. - Birds have a four-chambered heart, consisting of two atria and two ventricles, which allows for efficient separation of oxygenated and deoxygenated blood. **Hint:** Recall the heart structure of birds compared to other vertebrates. ### Step 4: Analyze the Digestive System - The fourth character states that the digestive tract has additional chambers, specifically a crop and gizzard. - Birds possess a crop for storage of food and a gizzard for grinding food, which is a unique adaptation in their digestive system. **Hint:** Think about animals that have specialized digestive organs for processing food. ### Conclusion Based on the analysis of all four characteristics: - The animal with dry skin (with oil glands), that is warm-blooded, has a four-chambered heart, and possesses a crop and gizzard is a bird. - Among the options provided, **Columba** (the scientific name for pigeons) fits all these characteristics. **Final Answer:** The animal is **Columba** (a bird).
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