Zoology MCQs for NEET — Practice Questions with Answers

In humans, the coccyx, also known as the tailbone, is formed by the fusion of four vertebrae. These are the last few segments of the vertebral column.

The appendicular skeleton is formed by the bones of the pectoral girdle (shoulder girdle), pelvic girdle (hip girdle), and the limbs (arms and legs). This part of the skeleton is involved in locomotion and manipulation of objects.

In the human body, there are 12 pairs of ribs. The last two pairs, which are the 11th and 12th pairs, are called floating ribs because they are not attached to the sternum or other ribs. Therefore, the correct answer is 2 pairs.

A sarcomere is the basic unit of a muscle's cross-striated myofibril. It is defined as the segment between two neighboring Z-lines (or Z-discs). Therefore, the distance between two consecutive Z-lines is the length of a sarcomere.

The appendicular skeleton consists of 126 bones. It includes the bones of the upper limbs, lower limbs, pectoral girdle, and pelvic girdle. Therefore, there are 126 bones in the appendicular skeleton.

Hinge joints are found in the elbow and knee. These joints allow for movement in one plane, similar to the motion of a door hinge. The elbow joint connects the humerus to the ulna, and the knee joint connects the femur to the tibia.

Synovial joints are the most common and movable type of joints in the human body. They include ball and socket joints (e.g., shoulder and hip joints), pivot joints (e.g., the joint between the first and second cervical vertebrae), and hinge joints (e.g., elbow and knee). Therefore, the correct option is 'All the above'.

The human cranium consists of 8 bones. These bones include the frontal bone, two parietal bones, two temporal bones, the occipital bone, the sphenoid bone, and the ethmoid bone. These bones protect the brain and support the structures of the face.

Red muscles, also known as slow-twitch muscles, have a high content of myoglobin. Myoglobin is a red pigment that stores oxygen, which is essential for aerobic respiration. This makes red muscles more suited for endurance activities.

Synovial fluid is present in ball and socket joints and acts as a lubricant to reduce friction between the articular cartilage of synovial joints during movement.