Animal Tissue Test - 6

Simple branched alveolar gland has number of sacs opening in the same duct. Example of such glands are sebaceous glands, or oil glands in the skin of mammals.

Epithelial tissue is of two types: simple epithelium and compound epithelium. Simple epithelium is divided as squamous, cuboidal, columnar, ciliated and pseudo stratified.

Blood vessels are covered by epithelial tissues.

The Casparian strip is a band of cell wall material deposited in the radial and transverse walls of the endodermis, and is chemically different from the rest of the cell wall. It is is made of suberin and sometimes lignin.

Tuberous root is a thick and fleshy root, like a tuber but without buds. Examples of plants with notable tuberous roots include the sweet potato, cassava, and dahlia.

The vascular bundles of a monocot stem are collateral and closed. A collateral bundle is a vascular bundle in which the phloem and xylem lie on the same radius, with the phloem located towards the periphery of the stem and the xylem towards the centre, and the 'closed' bundles of monocots lack cambium.

Stipules give protection to axillary bud. They occur where the base of the leaf petiole joins the stem, and are a reliable tool in plant identification. Usually they are small and in pairs, one on each side of the petiole base.

The central axis of banana that is concealed at the bottom of the pseudostem is called shaft. At the time of flowering, the shaft elongates, pierces through the pseudostem and produces an inflorescence terminally.

Fusiform initial cells produce vascular rays. The fusiform initials are elongated tapering cells that give rise to all cells of the vertical system of the secondary phloem and xylem (secondary tracheary elements, fibres, and sieve cells and the associated companion cells).

In protostele, the vascular tissue is a solid mass and the central core of the xylem is completely surrounded by the strand of phloem. This is the most primitive and simplest type of stele.
Most of the pteridophytes show protostelic condition in their rhizome, stem, or roots.