Zoology MCQs for NEET — Practice Questions with Answers

Paramecium moves using tiny hair-like structures called cilia. These cilia beat in a coordinated manner to propel the organism through water. This type of movement is known as ciliary movement.

The movement of internal organs such as the intestines, blood vessels, and other organs is controlled by non-striated muscles, also known as smooth muscles. These muscles contract and relax involuntarily to facilitate organ movement.

The functional unit of voluntary (skeletal) muscles is the sarcomere. A sarcomere is the basic structural and functional unit of muscle fibers and is responsible for muscle contraction. It is composed of actin and myosin filaments arranged in a specific pattern.

Cardiac muscle is a specialized type of muscle found only in the heart. It is responsible for the rhythmic contractions that pump blood throughout the body. Unlike other types of muscle tissue, cardiac muscle is involuntary and has unique intercalated discs that help synchronize heart contractions.

The three types of muscle found in humans are skeletal muscle, visceral (smooth) muscle, and cardiac muscle. Skeletal muscle is attached to bones and is responsible for voluntary movements. Visceral muscle is found in the walls of internal organs and is involuntary. Cardiac muscle is found only in the heart and is also involuntary.

Hydra do not possess flagella. Instead, they use their tentacles for capturing prey and movement. The other options correctly match the organisms with their respective structures used for movement or feeding: Cilia in Paramecium, Tentacles in Hydra, and Pseudopodia in Amoeba.

The H-line (or H-zone) is a part of the A-band in striated muscle, not nonstriated muscle. Nonstriated muscles, such as smooth muscle, do not have the distinct banding pattern seen in striated muscles (skeletal and cardiac muscles). Therefore, the pair 'H-line – Nonstriated muscle' is improper.

Humans have 12 pairs of ribs, not 22 pairs. The axial skeleton consists of 80 bones, the cranium has 8 bones, and the vertebral column is made up of 26 vertebrae. Therefore, the pair 'Ribs – 22 pairs' is improper.

An arm consists of 30 bones: 1 humerus, 1 radius, 1 ulna, 8 carpals, 5 metacarpals, and 14 phalanges. Therefore, the correct number of bones in an arm is 30.

Ribs are attached to the sternum via costal cartilages. The sternum is a long flat bone located in the central part of the chest, and it plays a critical role in protecting the heart and lungs.