Types of Neurons

Q. A neuron with one axon only may be observed in:

1. Dorsal root ganglion of spinal nerve
2. Embryonic stage
3. Retina of eye
4. All of these

Q.

Animals with a double ventral notochord, dorsal nerve cord, pharyngeal gill slits and a post anal tail are placed in the highly evolved phylum called_____.

1. Invertebrata

2. Vertebrata

3. Hemichordata

4. Chordata

Q. Those nerves which carry impulses from the central nervous system to the muscles and glands are known as -

1. Motor nerves
2. Sensory nerves
3. Mixed nerves
4. Afferent nerves

Q. Unipolar neurons are found only in

1. early embryos
2. olfactory epithelium
3. retina of the eye
4. spinal cord

Q. Match the following from column I and column II.

$\begin{array}{cc}\text{Column-I}& \text{Column-II}\\ \text{(A) Bipolar neuron}& \text{(i) Embryonic stage}\\ \text{(B) Unipolar neuron}& \text{(ii) Cerebral cortex}\\ \text{(C) Multipolar neuron}& \text{(iii) Retina}\end{array}$

1. A-iii, B-i, C-ii
2. A-ii, B-i, C-iii
3. A-iii, B-ii, C-i
4. A-ii, B-iii, C-ii

Q. Differentiate between dendrites and axon.

Q.

what is the difference between myelin sheath and schwann cell

Q. Match the following:

$\begin{array}{cc}\text{I. Multipolar neuron}& p.\text{Two processes}\\ \text{II. Bipolar neuron}& q.\text{Single process that splits into two}\\ \text{III. Unipolar}& r.\text{One axon and many dendrites}\\ \text{IV. Pseudounipolar neuron}& s.\text{Found in embryonic state}\end{array}$

1. I-q, II-s, III-p, IV-r
2. I-q, II-s, III-r, IV-p
3. I-r, II-p, III-s, IV-q
4. I-q, II-s, III-r, IV-p

Q. In myelinated neuron the myelin sheath is covered by schwann cells then why we say that myelin sheath is acting as a insulating barrier rather than this we should say schwann cells are acting as insulating barrier ?