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Anatomy of Flowering Plants
What is stomatal apparatus? Explain the structure of stomata with a labelled diagram.
Stomata are small pores present in the epiderms of leaves.
The stomatal aperture, guard cells and the subsidiary cells together are called the stomatal apparatus.
Structure of stomata: Each stomata is composed of two bean-shaped structure called guard cells. In grasses the guard cell is dumbbell shaped. The inner walls of guard cells are thick, while the outer walls are thin. The guard cells are surrounded by subsidiary cells. These are the specialised epidermal cells present around the guard cells called the subsidiary cells.
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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?
Why are xylem and phloem called complex tissues?
What is stomatal apparatus? Explain the structure of stomata with a labelled diagram.
Name the three basic tissue systems in the flowering plants. Give the tissue names under each system.
How is the study of plant anatomy useful to us?
What is periderm? How does periderm formation take place in the dicot stems?
Describe the internal structure of a dorsiventral leaf with the help of labelled diagrams.
Cork cambium forms tissues that form the cork. Do you agree with this statement? Explain.
A transverse section of stem is stained first with safranin and then with fast green following the usual schedule of double staining for the preparation of a permanent slide. What would be the colour of the stained xylem and phloem?
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