Which one of the following ancestors of man first time showed bipedal movement?

Options

A. Peking Man
B. Australopithecus
C. Java man
D. Cro-Magnon Man.

Explanation

**Step-by-Step Text Solution:**

1. **Understanding Bipedal Movement:**
- Bipedal movement refers to the ability to walk on two legs. This is a significant characteristic that distinguishes humans and their ancestors from other primates.

2. **Identifying the Ancestors of Man:**
- The question asks which ancestor of man first exhibited bipedal movement. We need to analyze the options provided.

3. **Analyzing the Options:**
- **Option A: Packing Man** - This refers to the first fossil discovered, which was a tooth found in 1926. However, there is no evidence that Packing Man exhibited bipedal movement, making this option incorrect.

- **Option B: Australopithecus** - This is a genus of hominins that lived in Africa and is known for its bipedal locomotion. Australopithecus is widely recognized as the first ancestor of man to show bipedal movement, making this option correct.

- **Option C: Java Man** - Java Man is classified as a Pleistocene hominid and is considered a direct ancestor of Homo erectus. However, it is not the first to show bipedal movement, so this option is incorrect.

- **Option D: Cro-Magnon Man** - Cro-Magnon is an early modern human and is classified as Homo sapiens. While they certainly walked bipedally, they are not the first ancestor to do so, thus making this option incorrect.

4. **Conclusion:**
- After evaluating all the options, the correct answer is **Australopithecus**, as it was the first ancestor of man to exhibit bipedal movement.

**Final Answer: Australopithecus**

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