As per Heyden's classification, the hair Index of 'Leiotrichi' Human race is:

Question

Accepted Answer

According to Heyden's classification, the hair index of 'Leiotrichi' human race is approximately 80. This means that Option 4 is the correct answer. Leiotrichi, characterized by straight hair, typically exhibit a higher hair index value.

Here's why the other options are incorrect:

*   **Option 1 (20 to 40):** This range represents a very low hair index, which is not characteristic of Leiotrichi. Low hair index values are associated with tightly curled or woolly hair types.

*   **Option 2 (40 to 60):** This range is also too low for Leiotrichi. While it represents a less extreme curl than Option 1, it still doesn't align with the straight hair characteristic of this group.

*   **Option 3 (60 to 70):** This range is closer to the expected value for Leiotrichi compared to Options 1 and 2, but it's still not as accurate as Option 4. The hair index for straight hair tends to be higher than this range.

Therefore, based on Heyden's classification, Option 4 (Approximately 80) is the most accurate representation of the hair index for the 'Leiotrichi' human race.