OBJECTIVE LIFE SCIENCE
PLANT PHYSIOLOGY
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
This tissue is composed of mostly living cells:sieve cells in conifers and; sieve tube elements with companion cells in hardwoods:
|
|
Functional phloem
|
|
|
Functional xylem
|
|
|
Parenchyma cells
|
|
|
None of the above
|
Explanation:
Detailed explanation-1: -SIEVE ELEMENTS (OF PHLOEM) Sieve elements are specialized cells that function in the conduction of sugars. They are typically associated with parenchyma and often some sclerenchyma in a common tissue known as phloem (Gr.
Detailed explanation-2: -PHLOEM. The structural elements of phloem include sieve tubes, companion cells, phloem parenchyma and secretory cells. The sieve tube is the conducting element of the phloem. It is formed from a vertical series of elongated cells, interconnected by perforations in their walls in areas known as sieve plates.
Detailed explanation-3: -Phloem companion cells are parenchymatous and these have a nucleus. These are also the living cells of phloem. Phloem fibers are dead.
There is 1 question to complete.