Question 1. What are complex tissue?
Question 2. Name two types of complex tissues?
Question 3. What is the function of xylem in plants?
Question 4. What is the function of phloem in plants?
Question 5. Name different types of xylem tissue?
Question 6. Name different types of phloem tissue?
Question 7. Differentiate between tracheid and vessels?
Complex
The complex tissue consist of more than one type of cells. All the cells coordinate to perform a common function. They transport water, minerals salts, food material to various parts of plant body.
They are of 2 types:
(1) Xylem
(2) Phloem
They are conducting tissue and called as vascular tissue.
Xylem
It is composed of 4 different types of cell :-
(1) Tracheids: They help in transport of water and minerals vertically.
(2) Vessels: They help in transport of water and minerals vertically.
(3) Xylem parenchyma: They store food, helps in sideways conduction of water.
(4) Xylem sclerenchyma(fibre):They are supportive in nature.
Phloem
It is composed of 4 types of cells :-
(1) Sieve tubes: They are tubular shape, their walls are perforated by numerous pores.
(2) Companion cell: They are associated with sieve tubes is a small thin walled cells containing dense and very active cytoplasm an large elongated nucleus.
(3) Phloem parenchyma
(4) Phloem fibres: They are dead cells.
Phloem transport prepared food material from leaves to various plant parts.