Read the following four statements (I - IV)
I. All mammals exclusively respire by using lungs except Balaenoptera.
II. In Aves, the skin is dry without any glands except the sudorific gland at the base of the tail.
III. Chameleon is a camouflaged tree lizard with a prehensile tail.
IV. Amphibia is the only tetrapod vertebrate which has external fertilization with indirect development .
How many statement is / are correct from the above ?

Options

A. Four
B. One
C. Three
D. Two

Answer

To determine how many statements are correct from the given options, we will analyze each statement one by one.

### Step 1: Analyze Statement I
**Statement I:** "All mammals exclusively respire by using lungs except Balaenoptera."

- **Analysis:** Balaenoptera refers to the genus of whales, which are mammals. While it is true that whales breathe using lungs, the statement implies that Balaenoptera is an exception to all mammals using lungs. This is misleading because Balaenoptera does indeed respire using lungs, just like all other mammals. Therefore, this statement is **incorrect**.

### Step 2: Analyze Statement II
**Statement II:** "In Aves, the skin is dry without any glands except the sudorific gland at the base of the tail."

- **Analysis:** Aves (birds) have dry skin, but they also have other glands, such as the uropygial gland (oil gland) that helps in waterproofing their feathers. The sudorific gland mentioned is not the only gland present. Thus, this statement is also **incorrect**.

### Step 3: Analyze Statement III
**Statement III:** "Chameleon is a camouflaged tree lizard with a prehensile tail."

- **Analysis:** Chameleons are indeed known for their ability to camouflage and are often referred to as tree lizards. They possess a prehensile tail which helps them grasp branches. Therefore, this statement is **correct**.

### Step 4: Analyze Statement IV
**Statement IV:** "Amphibia is the only tetrapod vertebrate which has external fertilization with indirect development."

- **Analysis:** Amphibians typically undergo external fertilization, and many have indirect development (larval stage). While this statement is generally true, it is important to note that some fish also exhibit external fertilization. However, in the context of tetrapod vertebrates, this statement holds true. Thus, this statement is **correct**.

### Conclusion
Now, we summarize the correctness of each statement:
- Statement I: Incorrect
- Statement II: Incorrect
- Statement III: Correct
- Statement IV: Correct

**Total Correct Statements:** 2 (Statements III and IV)

### Final Answer
**There are 2 correct statements.**

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