Zoology MCQs for NEET — Practice Questions with Answers

The cerebral aqueduct, also known as the aqueduct of Sylvius, is a narrow channel that passes through the midbrain. It connects the third ventricle, located in the diencephalon, to the fourth ventricle, which is situated between the pons and the medulla oblongata. This pathway is essential for the circulation of cerebrospinal fluid within the brain's ventricular system.

The corpora quadrigemina are located on the dorsal (posterior) surface of the midbrain. They consist of four colliculi—two superior and two inferior—that are involved in visual and auditory reflexes, respectively.

The superior colliculi are part of the midbrain and are primarily involved in the control of visual reflexes. They help in the coordination of eye movements and the processing of visual stimuli.

The secretion of saliva on seeing tasty food is a conditioned reflex, which is different from the other options listed. Antiperistalsis, peristalsis, and heart-beat are all examples of unconditioned reflexes, which occur naturally without prior learning.

Conditioned reflexes are learned responses to stimuli, often through repeated association. Prejudices (1), Dis-liking (4), and Habits (5) are all examples of such learned responses, making option 3 correct.

During depolarization, the permeability of Na⁺ (sodium ions) increases. This influx of sodium ions causes the inside of the neuron to become more positive, leading to depolarization.

The main divisions of the autonomic nervous system are the Sympathetic and Parasympathetic systems. These systems work together to regulate involuntary body functions such as heart rate, digestion, and respiratory rate.

The malleus bone is one of the three ossicles in the middle ear and it directly attaches to the tympanic membrane (eardrum). This helps in transmitting sound vibrations from the air to the inner ear.

The correct order of the middle ear ossicles from the tympanic membrane to the internal ear is: malleus, incus, and stapes. The malleus attaches to the tympanic membrane, the incus connects the malleus to the stapes, and the stapes fits into the oval window leading to the internal ear.

The cochlea is a part of the inner ear, and the area around the cochlear duct (also known as the scala vestibuli and scala tympani) is filled with perilymph. Perilymph is a fluid that resembles extracellular fluid and is found within the bony labyrinth of the inner ear.