Question

The body part, which is absent in birds
A. Forelimb
B. Hindlimb
C. Pectoral girdle
D. Pelvic girdle

Answer 1

Hint:
Before we proceed with the problem, it is important to know about bird parts.
All contemporary birds have beaks, wings, and feathers. Additionally, they have a variety of other distinguishing qualities, the majority of which are flying adaptations. Birds use flight as a mode of movement to obtain food and mates, as well as to stay away from predators. Birds move their wings with the help of their chest muscles. Feathers perform a variety of functions for birds, including insulation and flight.

Complete step by step answer:
Birds lack forelimbs because they have evolved wings for flying. When compared to the size and strength of the bird, they are extremely powerful and are attached high on the back, to the anterior or thoracic part of the trunk.
Each wing has a longitudinal axis that is at a right angle to the trunk and is lengthened, flattened, and distally pointed. The three components of the hindlimb are the thigh, shank, and foot. Each side's pectoral girdle is made up of three bones: a big coracoid, a scapula, and a clavicle. The ilium, ischium, and pubis are the three bones that make up the pelvic girdle.

Option ‘A’ is correct

Note:
Birds' forelimbs mimic human forearms in appearance. The radius and humerus bones, which are fused together, make up the forelimbs of birds. To aid in flight, the forelimbs have been adapted to function as wings. The location where the flight muscles are attached at the breastbone. Birds' hindlimbs are adapted into legs for hopping, walking, and other activities. Birds' forelimbs are transformed into wings as a result.