Which of the following statements is not correct?

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The midbrain is located between the hypothalamus and the pons.

The axoplasm contains high concentration of K⁺ and low concentration of Na⁺.

The reflex arc comprises at least one afferent neuron and one efferent neuron appropriately arranged in a series.

The cones contain rhodopsin and are specialised for scotopic vision.

answer is D.

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Detailed Solution

Cones do not contain rhodopsin. Rhodopsin is found in rod cells. Cones contain three types of cone pigments (sensitive to long-wavelength, medium-wavelength and short-wavelength light) and are responsible for color vision and function in photopic (daylight) conditions.
The midbrain is indeed located between the hypothalamus (above) and the pons (below).
In neurons, the axoplasm contains a high concentration of K+ and a low concentration of Na+, compared to the extracellular fluid.
The reflex arc involves a sensory (afferent) neuron transmitting a signal to an interneuron or directly to a motor (efferent) neuron, allowing for a rapid response to a stimulus.

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