Question

the four lobes of the cerebral cortex are physically separated by deep grooves, which are known as
hemispheres.
sulci.
neurotransmitters.
association areas.

Explanation:

1. Analyze Option A (hemispheres): The cerebral cortex has two hemispheres (left and right), separated by the longitudinal fissure. Hemispheres are not the deep grooves separating lobes, so A is incorrect.
2. Analyze Option B (sulci): Sulci are the deep grooves (or furrows) in the cerebral cortex that physically separate the different lobes (e.g., the central sulcus separates the frontal and parietal lobes). This matches the description in the question.
3. Analyze Option C (neurotransmitters): Neurotransmitters are chemical messengers that transmit signals between neurons. They have nothing to do with the physical separation of cerebral cortex lobes, so C is incorrect.
4. Analyze Option D (association areas): Association areas are regions of the cerebral cortex involved in higher - order functions like learning, memory, and thinking. They are not the deep grooves separating lobes, so D is incorrect.

Answer:

B. sulci