How many of the following characteristic features are seen in dicot stem.
a) Epidermis is covered with a thin layer of cuticle, it may bear trichomes and a few stomata.
b) The cells arranged in multiple layers between epidermis and pericycle constitute the cortex.
c) Cortex consists of three sub-zones. The outer hypodermis, general cortex and endodermis.
d) Since the cells of the endodermis are rich in starch grains, this layer is also referred to as the starch sheath.

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a,b and c only

b,c and d only

a,c and d only

a,b c and d

answer is D.

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Detailed Solution

Epidermis is covered with a thin layer of cuticle, it may bear trichomes and a few stomata. The cells arranged in multiple layers between epidermis and pericycle constitute the cortex. Cortex consists of three sub-zones. The outer hypodermis is collenchymatous , general cortex is parenchymatous, and endodermis is rich in starch grains. Pericycle is semilunar patches like, mad e up of sclerenchyma. Stele is characterized with ring form of arrangement of vascular bundles. Pith is conspicuous.

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