Phloem

Question 1

what are the cell types of phloem and their principal functions

Answer 1

sieve elements, sieve cells(with albuminous cells), sieve-tube elements(with companion cells), sclerenchyma (fibers and sclereids) and parenchyma. Functions are long distance conduction of food materials for sieve elements, support and sometimes storage for sclerenchyma and storage for parenchyma

Question 2

what are the characteristics of helianthus annuus when stained with TBO

Answer 2

primary phloem consists of sieve tube members, parenchyma, companion cells and fibres

Question 3

what are the characteristics of Zea mays when stained with TBO

Answer 3

sieve tube members, companion cells, parenchyma and fibres

Question 4

what are the characteristics of a cucumber stem stained with TBO

Answer 4

sieve tube members, sieve plates and cortex

Question 5

what are the characteristics of cucumis sativus when stained with aniline blue and viewed with UV light

Answer 5

callose surrounding pores in sieve plates and lateral sieve area

Question 6

what are the characteristics of cucumis sativus when stained with TBO or acid fuschin

Answer 6

P-protein which is evident at the ends of sieve tube members

Question 7

what are the characteristics of phloem tissue in the stem of squash

Answer 7

immature sieve tube elements vs mature sieve elements and when immature there are 2 companion cells vs mature where they fuse to make one companion cell