Anatomy Of Flowering Plants

Question

Why are xylem and phloem called complex tissues?

Solution

Both the xylem and the phloem are made up of more than one type of the cells which work as a unit.
Xylem helps in conducting water and minerals. It is made up of the following components:

Tracheids (xylem vessels and xylem tracheids)
Xylem parenchyma
Xylem fibres

These cells work in coordination and help in the storage of food materials and in the radial conduction of water.
Phloem helps in conducting food materials. It is composed of:

Sieve tube elements
Companion cells
Phloem parenchyma
Phloem fibres

The cells of the phloem work as a unit to conduct prepared food from the leaves to the different parts of the plants.

Some More Questions From Anatomy of Flowering Plants Chapter

State the location and function of different types of meristems.

Explain the process of secondary growth in the stems of woody angiosperms with the help of schematic diagrams. What is its significance?

Draw illustrations to bring out anatomical difference between:
(a) Monocot root and dicot root
(b) Monocot stem and dicot stem

Cut a transverse section of young stem of a plant from your school garden and observe it under the microscope. How would you ascertain whether it is a monocot stem or a dicot stem? Give reasons.

The transverse section of a plant material shows the following anatomical features:
(a) the vascular bundles are conjoint, scattered and surrounded by a sclerenchymatous bundle sheaths.
(b) phloem parenchyma is absent. What will you identify it as?

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