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The scapula forms the shoulder joint by articulating with the humerus. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.
Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Structural Organisation in Animals and Frog, Topic: Tissues, skeletal and organ systems.
Pav = FA, F = mg = 45×9.8 = 441N. Total area A = 2×18×10−4 = 3.6×10−3m2. Pav = 4413.6×10−3 = 1.225×105Pa. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 1.225 × 10⁵ Pa. This satisfies dimensional consistency and physical conditions given, so option B is scientifically correct.
Ref: NCBI Bookshelf, Ideal Gas Law: P1V1/T1 = P2V2/T2.
Osteoporosis is a condition in which bones become weak and brittle due to excessive calcium loss.
Ref: NCERT Class 11 Biology Chapter 17: Locomotion and Movement Disorders of Muscular and Skeletal System
Ligaments are strong connective tissues that connect bones and stabilize joints.
Ref: NCERT Class 11 Biology Chapter 17: Locomotion and Movement Appendicular Skeleton - Pectoral and Pelvic Girdles
Calcitonin lowers blood calcium levels by promoting calcium deposition in bones.
Ref: NCERT Class 11 Biology Chapter 17: Locomotion and Movement Appendicular Skeleton - Pectoral and Pelvic Girdles
The axial skeleton includes the skull, vertebral column, ribs, and sternum, but the human skeleton consists of 206 bones, not 208.
Ref: NCERT Class 11 Biology Chapter 17: Locomotion and Movement Skeletal System - Axial Skeleton - Skull Vertebral Column
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