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Anatomy of Flowering Plants
Lenticels are involved in
transpiration
gaseous exchange
food transport
photosynthesis
B.
gaseous exchange
Plants have stomata and lenticles involved in gaseous exchange. In stems the living cells are organised in thin layers inside and beneath the bark. They have openings called lenticles.
Transpiration is the evaporative loss of water by plants. It occurs mainly through stomata in leaves.
Food transport occurs by the vascular tissue phloem from a source to a sink.
Photosynthesis is a physico-chemical process by which they use light energy to derive re- synthesis of organic compounds.
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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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