Specimens I and J are cross-sections of two plants whose cut ends were dipped in red ink or eosin (red dye) for at least 6 hours (a) Observe specimen I with the hand lens provided. Record your observation about the colouring of the tissues by the red ink or eosin.
(a) Observation after colouring the tissue by the red ink or eosin - The fing-like section is stained red. The remaining sections remain colourless (i.e others are not stained) (b) Observation after flooding with a drop of iodine for about one minute -A layer of ring-like tissue is stained blue-black or dark (c) () In (a) the tissue stained red conducts water and mineral salts (ü) In (b) the tissue stained active blue-black or black stores starch (d) Differences between the arrangements of tissues in specimen I and J
I dicot Stem
(i) Ring like vascular bundles (i) Presence of cambium (iii) Has wide cortex (v) Has distinct endodemis or starch sheath (v) Has distinct pith
J Monocot Stem
(i)Scattered vascular bundles (ii) Absence of cambium (iii) Has narrow or small cortex (iv) Has no endodermis or starch sheath (v)Has no distinct pith or has no pith
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