Answers

2015-07-28T20:29:32+05:30
PHLOEM

1.
Transportation of food and nutrients such as sugar and amino acids from leaves to storage organs and growing parts of plant
 2.phloem is not star shaped 
3.
Elongated, tubular shape with thin walled sieve tubes. The sieve tubes have pores at each end in the cross walls and microtubules that extend between sieve elements allowing longitudinal flow of material.
4.bidirectional 
xylem
1. 
Water and mineral transport from roots to aerial parts of the plant.

2.
Xylem is star shaped
3.
Tubular shape with no cross walls which allows a continuous column of water + facilitates more rapid transport within the xylem vessels. There are two types - protoxylem (first formed xylem) + metaxylem (mature xylem) depending on pattern of lignin.
4.unidirectional 
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