Read the following statements and identify the incorrect one .

Options

A. The movements exhibited by macrophages and leucocytes and streaming of protoplasm are examples of the same movement .
B. The activity of muscles located in the reproductive tract is not under the voluntary control of the nervous system .
C. In the muscle fibers which have less quantity of myoglobin, the number of mitochondria as well as sarcoplasmic reticulum is also less.
D. The bones of the limbs along with their girdles constitute appendicular skeleton.

Answer

To solve the question, we need to evaluate each statement provided and identify the incorrect one. Let's go through each statement step by step.

### Step 1: Analyze the First Statement
**Statement 1:** The movement exhibited by macrophages and leukocytes and streaming of protoplasm are examples of the same type of movement.

- **Analysis:** Macrophages and leukocytes (white blood cells) exhibit amoeboid movement, which involves the formation of pseudopodia. Streaming of protoplasm in amoeba is also a form of amoeboid movement. Therefore, this statement is **correct**.

### Step 2: Analyze the Second Statement
**Statement 2:** The activity of the muscles located in the reproductive tract is not under the voluntary control of the nervous system.

- **Analysis:** The muscles in the reproductive tract, particularly the myometrium (muscle layer of the uterus), are indeed not under voluntary control; they are regulated by hormones such as oxytocin. Thus, this statement is also **correct**.

### Step 3: Analyze the Third Statement
**Statement 3:** In muscle fibers which have less quantity of myoglobin, the number of mitochondria as well as sarcoplasmic reticulum both are less.

- **Analysis:** Muscle fibers with less myoglobin are typically referred to as white fibers (fast-twitch fibers). While it is true that these fibers have fewer mitochondria, they actually have a higher amount of sarcoplasmic reticulum compared to red fibers (slow-twitch fibers). Therefore, this statement is **incorrect** because it inaccurately states that both mitochondria and sarcoplasmic reticulum are less.

### Step 4: Analyze the Fourth Statement
**Statement 4:** Bones of the limbs along with the girdles constitute the appendicular skeleton.

- **Analysis:** This statement is correct. The appendicular skeleton includes the bones of the limbs and the girdles (pectoral and pelvic girdles). Thus, this statement is **correct**.

### Conclusion
After analyzing all four statements, the only incorrect statement is **Statement 3**.

### Final Answer
The incorrect statement is: **In muscle fibers which have less quantity of myoglobin, the number of mitochondria as well as sarcoplasmic reticulum both are less.**

---