The transport of substances in xylem is unidirectional
The epithelial cells present in the lining of wind pipe are ciliated
Answers
Answer:
Plant tissues are divided into two broad categories:
(i) Meristematic tissue: It is further subdivided into apical, lateral, and intercalary meristems.
(ii) Permanent tissue: They are of two types.
(a) Simple permanent tissues include parenchyma, collenchyma, and sclerenchyma.
(b) Complex tissues include xylem and phloem.
Simple tissue:
These tissues are composed structurally and functionally of similar cells.
They are of three types.
(i) Parenchyma:
It is widely distributed in plant bodies such as stems, roots, leaves, flowers, and fruits. Its cells are isodiametric and contains live protoplasm. It serves as a food storage and packing tissue. It also stores waste products of plants.
(ii) Collenchyma:
It is located below the epidermis of dicot stem and petiole. It consists of living cells and is characterised by an extra deposition of cellulose at the corners. It is a mechanical tissue in young plants. It also provide elasticity to the plant, particularly stem of dicots.
(iii) Sclerenchyma:
It consists of dead lignified cells. It occurs in abundance or in patches in definite layers in stems, roots, veins of leaves, hard covering of seeds, and nuts. It provides mechanical support to the plant.
Explanation: