Concept: This question tests your knowledge of the structure and classification of neurons, specifically focusing on the number of axons and dendrites.

Why (C) is correct: The statement 'Unipolar neuron: 1 axon and 1 dendrite' is a mismatched pair. A unipolar neuron has only one process extending from the cell body, which then branches into an axon and a dendrite-like structure. It does not have a separate axon and a separate dendrite originating directly from the cell body. The description '1 axon and 1 dendrite' actually fits a bipolar neuron.

Why other options are wrong:

• (A) Synaptic knob: Neurotransmitters: This is a correct match. The synaptic knob (or terminal) is the swollen end of the axon where neurotransmitters are stored and released.
• (B) Multipolar neuron: 1 axon and two or more dendrite: This is a correct match. Multipolar neurons are the most common type, characterized by one axon and multiple dendrites.
• (D) Bipolar neuron: 1 axon and 1 dendrite: This is a correct match. Bipolar neurons have two processes extending from the cell body: one axon and one dendrite.

Common Mistake: Students often confuse the definitions of unipolar, bipolar, and multipolar neurons, especially regarding the number of processes originating directly from the cell body versus the total number of axons and dendrites.

NEET Tip: Remember the prefixes: 'Uni-' (one process), 'Bi-' (two processes), 'Multi-' (many processes). Focus on the number of processes emerging directly from the cell body, not the total number of branches.

Correct Answer: (C)