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THE PLANT CELL 



Typical Cells of Plant. 



i. Examine the fixed and stained section of the young growing portion of the root of the bean plant under 

 the high power. Find and draw (a) cubical cells with very thin cell-walls completely filled with protoplasm each 

 containing a large round nucleus shewing the deeply staining (chromatin) nuclear network, (b) oblong cells 

 in which a vacuole has appeared in the protoplasm, the nucleus remaining in a central position, (c) much longer 

 oblong cells in which the protoplasm forms a thin layer on the cell-wall : in this layer the nucleus is enclosed, 

 bulging out the protoplasm into the vacuole, which now fills the whole of the centre of the cell, occupying much 

 the greater portion of its volume. 



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2. Mount a leaf of Elodea in water. Examine under a low power and note that the leaf consists of 

 numerous cells. Sketch a single cell under the high power, shewing the cell-wall, protoplasm, chloroplasts, 

 nucleus, and vacuole. The nucleus is often somewhat difficult to find. 



Movement of plant protoplasm. 



Observe the circulation of the protoplasm especially in the cells along the middle of the under surface of the 

 leaf. The green chloroplasts are carried round and round the cell by this circulation. Indicate in your sketch 

 the course of the circulation by means of arrows. 



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