Question

Select the correct set of evolutionary characters of man.

• A. Prognathus face, bony eyebrow ridge, presence of chin.
• B. Erect posture, opposable thumb, shorter forelimbs.
• C. Broad pelvic girdle, long forelimbs, presence of chin.
• D. Long forelimbs, presence of lumbar curvature, prognathus face.

Hint:

Humans are bipedal organisms with reduced prognathism and high manual dexterity due to opposable thumbs.

Answer 1

The Correct Option is B

Concept:
Humans (Homo sapiens) show several evolutionary adaptations for bipedalism and advanced manipulation abilities. These include erect posture, development of hands for grasping, and structural changes in limbs.

Step 1: Identify key human evolutionary traits. Important features include:
• Erect (bipedal) posture
• Opposable thumb for precision grip
• Shorter forelimbs compared to hindlimbs
• Presence of chin
• Reduced prognathism (flatter face)

Step 2: Analyze each option.
• (A) Prognathus face, bony eyebrow ridge, presence of chin → Prognathism and heavy brow ridges are primitive traits $\times$
• (B) Erect posture, opposable thumb, shorter forelimbs → Correct set of human evolutionary features \checkmark
• (C) Broad pelvic girdle, long forelimbs, presence of chin → Humans do not have long forelimbs $\times$
• (D) Long forelimbs, presence of lumbar curvature, prognathus face → Long forelimbs and prognathism are not human traits $\times$

Step 3: Conclusion. Hence, the correct evolutionary characters of man are: \[ \text{Erect posture, opposable thumb, shorter forelimbs} \]