ANATOMY OF DICOT AND MONOCOT ROOTS
AMPHIVASAL : Phloem lies in the centre xylem surrounds it.
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BIOLOGY
PLANT COMPLEX TISSUE——– PHLOEM
Sieve plates and sieve areas:Group of pores present in the walls of sieve elements are called sieve areas & portion of cross wall possessing sieve areas is called sieve plates.In sieve cells sieve areas are located in the lateral walls where as in sieve tube elements they are located in end walls.
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COMPLEX TISSUE 24JULY2024
XYLEM PARENCHYMA: They are the only living parenchymatous cells in xylem .Their main function is to help in conduction and store food material.They are of two types:
(a)Wood parenchyma that formed from fusiform cambial initials.
(b) Ray parenchyma formed from ray initials of the cambium.
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PARTS OF TYPICAL ROOTS
QUISCENT CENTER: The region of inactive cells so they have light cytoplasm and small nuclei they replace the cells of root cap.
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MODIFICATIONS OF LEAVES
.Phyllodes: In this type of modification the main leaf reduced and the petiole or rachis modified into green coloured leaf like structure to perform photosynthesis.Phyllodes are the modification of xerophytic leaves to reduce transpiration.Ex. Australian Acacia
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STEM MODIFICATION PART 2
Tunicated bulb : Concentric layers of fleshy scales surrounding the reduced stem having terminal bud. The outer few scale form a membrane called tunic .In case of simple tunicated the scale leaves ring is surrounded by single tunic Ex Onion And in compound tunicated bulb the fleshy scales represent bulblets and each bulblet surrounded by its own tunic Ex. Garlic
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