sieve tube.
In spite of the fact that their cytoplasm is actively involved in the conduction of food materials, sieve-tube members do not have nuclei at maturity.
Sieve tube
Sieve tube cells
the lumen of a sieve tube
The sieve tube elements are specialized elongated cells in the phloem that connect end to end forming a tube. The main function of this tube is to transport nutrition in the form of carbohydrates. Sieve cells have no nucleus, ribosomes and cytoplasm, meanin they cannot carry out primary metabolic activities. The companion cells, which are closely associated with the sieve tube elements, carry out the their metabolic functions.
sieve tube.
In plant anatomy, sieve tube elements, are a specialized type of elongated cell in the phloem tissue of flowering plants. The ends of these cells connect with other sieve tube members, making up the sieve tube, whose main function is transport of carbohydrates in the plant.
In plant anatomy, sieve tube elements, are a specialized type of elongated cell in the phloem tissue of flowering plants. The ends of these cells connect with other sieve tube members, making up the sieve tube, whose main function is transport of carbohydrates in the plant.
Sieve tubes are located in the phloem tissue of vascular plants.
Cells containing sieve plates are called sieve tube members, a component of the phloem, which carries sugars produced in the leaves to various parts of the plant. They are characteristic of angiosperms (flowering plants) while gymnosperms (cone-bearing plants) have only sieve cells. Sieve cells and sieve tube members are collectively referred to as sieve elements.
A.in both directions simultaneously in each sieve tube sometimesB.in both directions simultaneously in each sieve tube all of the time.C.never in both directions simultaneously in each sieve tube.D.some sieve tube translocate in one direction while others translocate in another directionE.c and d is correct
In spite of the fact that their cytoplasm is actively involved in the conduction of food materials, sieve-tube members do not have nuclei at maturity.
Sieve tube
Sieve tube cells
sieve-tube elements
by flowing along with water through perforations in the sieve plate