Question

write three differences in internal structure of stems of monocotyledonous and docotyledonous plants.

Answer 1

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Three features of internal structure of stem of monocotyledonous plant.

(i) Circular stem, may have depressed structures due to the presence of lateral branches
(ii) Epidermis is composed of one layered parenchymatous cells and it surrounded by a thick layer of cuticle
(iii) Single layered cuticularised epidermis may contain multicellular trichomes.

Three features of internal structure of stem of dicotyledonous plant.

(i) Cortex : Inner to the epidermis is cortex consisting of multilayered hypodermis and parenchymatous cortex to provide mechanical strength. Resin ducts may be in the region of cortex.
(ii) Epidermis : It is the outermost single layered covering of stem having no intercellular spaces. It is covered by cuticle to reduce transpiration. Multicellular hairs are also present.
(iii) Endodermis : It is the outermost layer of cortex having barrel-shaped parenchyma cells containing starch grains.

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