Answer: Option C. -> Saddle Joint 
:
C
The bestexampleof asaddle jointin the body is the carpometacarpaljointof the thumb that is formed between the trapezium bone and the first metacarpal.
Interphalangeal joints are the hinge joints located between the fingers and the toes.
Anexample of a pivot jointis thejointof the first and second vertebrae of the neck that allows the head to move back and forth.
Ball and socket are found in the hip, where the rounded head of the femur (ball) rests in the cup-like acetabulum (socket) of the pelvis.

Answer: Option D. -> Sacrum and coccyx
:
D
The vertebræ are thirty-three in number, and are grouped under the namescervical, thoracic, lumbar, sacral,andcoccygeal,according to the regions they occupy; there are seven in the cervical region, twelve in the thoracic, five in the lumbar, five in the sacral, and four in the coccygeal.
The vertebræ in the upper three regions of the column remain distinct throughout life, and are known astrueormovablevertebræ; those of the sacral and coccygeal regions, on the other hand, are termedfalseorfixedvertebræ, because they are united with one another in the adult to form two bones—five forming the upper bone orsacrum,and four the terminal bone orcoccyx.

Answer: Option A. -> Wearing down of cartilage
:
A
Osteoarthritisis a joint disease that mostly affectscartilage.
Asprain, also known as a torn ligament.
Rheumatoidarthritis causes the normally thinsynovialmembrane (synovium) to become inflamed and thickened, leading to an accumulation ofsynovialfluid and causing pain andswelling.
Deposits of the needle-like urate crystals are responsible for the inflammation and the painful symptoms ofgouty arthritis.

Answer: Option D. -> Part of skeleton
:
D
Hip bone is called as the innominate bone. It is made up of 3 fused bones: Ilium, ischium and pubis. It is also referred to as ‘Pelvic bone’ or ‘Coxal bone’.

Answer: Option B. -> Knee joints and elbow joints
:
B
A hingejointis a common class of synovialjointthat includes the ankle,elbow, andknee joints. Hingejointsare formed between two or more bones where the bones can only move along one axis to flex or extend.
An example of apivot jointin the human skeletal system is the rotation of the atlas around the axis.
Theshoulder jointis formed where the humerus (upper arm bone) fits into the scapula (shoulderblade), like a ball and socket.

:
An example of a eukaryotic flagellatecellis the mammalian spermcell, which uses itsflagellumto propel itself through the female reproductive tract.

Answer: Option B. -> Thoracic ribs
:
B
Intercostal musclesare several groups ofmusclesthat runbetweenthe ribs, and help form and move the chest wall. Theintercostal musclesare mainly involved in the mechanical aspect of breathing. Thesemuscleshelp expand and shrink the size of the chest cavity to facilitate breathing.

Answer: Option A. -> Fascia
:
A
A fascia is a band or sheet of connective tissue, primarily collagen, beneath the skin that attaches, stabilizes, encloses, and separates muscles and other internal organs.
Theperitoneum, the serous membrane that forms the lining of the abdominal cavity.
Ligaments serve as connectors, linking the ends of bones together at a joint.
Tendons attach muscles to bones.

Answer: Option B. -> Cartilaginous joint
:
B
Cartilaginous joints are connected entirely by cartilage (fibrocartilage or hyaline). Cartilaginous joints allow more movement between bones than a fibrous joint but less than the highly mobile synovial joint.
A synovial joint is also known as diarthrosis. In this type, the joining bones are surrounded by a fibrous capsule making the joint space a cavity. Fibrous capsule is continuous with the periosteum of joining bones and is lined by a synovial membrane. Cavity is filled with a viscous fluid, synovial fluid, which provides lubrication of joints.The six types of synovial joints are the pivot, hinge,saddle, plane,condyloid, and ball-and-socket joints.

Answer: Option B. -> Burst of power
:
B
Red fibers are smaller in diameter; white fibers are larger in diameter. Red fibers have more mitochondria than white fibers. Red fibers make up slow-twitch muscle; white fibers make up fast-twitch muscle. Red fibers are more resistant to fatigue than are white fibers. Red fibers have more myoglobin (oxygen binding pigment) and also a large concentration of mitochondriathan white fibers. White fibers store glycogen and use anaerobic metabolism.
Red fiber and slow twitch muscle is for endurance.
White fiber and fast twitch muscle is for a burst of power.