Which one of the following statements are correct?

(i) The wall of internal organs such as the blood vessels, stomach and intestine contains smooth muscle tissue.

(ii) Cardiac muscle tissue is a contractile tissue present in heart only and contain communication junctions called intercalated discs at some fusion points to allow cell to contract as a unit.

(iii) Neurons is the unit of neural system and are exictable cells.

(iv) Neuroglia makes up less than one-half the volume of neural tissue in our body.

(v) Morphology refers to study of internal feature of organism.

(vi) Anatomy term is used for the study of morphology of internal organs in the animals.

(vii) The common Indian earthworms is called worm castings and the process of increasing the fertility of soil by earthworm is called vermicomposting.

(viii) The faecal deposit of earthworm is called worm castings and the process of increasing the fertility of soil by earthworm is called vermicomposting.

(ix) In earthworm, prostomium is a biloble which serves as a covering for the mouth.

(x) In earthworm, prostomium is a biloble which serves as a covering for the mouth.

(xi) In earthworm, segment 14-16 are covered by a prominent light band of glandular tissue called clitellum.

(xii) In earthworm, a single female genital pore is present in mid-dorsal line of 14 th segment and a pair of male genital pores are present on ventro-lateral sides of 18 th segment.

(xiii) Setae can be extended or retracted and play principle role in locomotion in pheretima.

(xiv) The body wall of earthworm is covered externally by a thin cellular cuticle layer.

(xv) A small narrow tube, oesophaus continues into a muscular gizzard which helps in grinding in earthworm.

Choose the correct option given below: