Concept: This question tests your understanding of the structure and function of a neuron, specifically focusing on the characteristics of dendrites.

Why (D) is correct: Dendrites are primarily involved in receiving nerve impulses and transmitting them towards the cell body. They do not contain neurotransmitters. Neurotransmitters are chemical messengers stored in vesicles within the axon terminals (synaptic knobs) and released into the synaptic cleft to transmit signals to the next neuron or effector cell.

Why other options are wrong:

A) This statement is correct. Dendrites are indeed short, branched fibers extending from the neuron's cell body.

B) This statement is correct. Dendrites, along with the cell body, contain Nissl's granules (ribosomes and RER), which are involved in protein synthesis.

C) This statement is correct. The primary function of dendrites is to receive signals and transmit them towards the cell body.

Common Mistake: Students often confuse the roles of dendrites and axon terminals regarding neurotransmitter storage and release.

NEET Tip / Mnemonic: Remember 'D' for Dendrite and 'Direction towards cell body', and 'A' for Axon and 'Away from cell body'. Neurotransmitters are stored at the 'end' of the axon, ready to 'transmit' the signal.

Correct Answer: (D)