The cells having sieve like perforations in their cell walls present in phloem are the sieve tubes of the phloem.
most dip tubes when they go bad don't look like anything at all because there's nothing left to it. when you pull out your cold side nipple which is 3 to 4" inches long then you can pull out your dip tube and inspect it. If your dip tube has cracks in it or holes then I would replace it . Most dip tubes in a water heater tank should be long enough so that the bottom of the dip tube is within 4 to 6" of the bottom of the tank.
The cast of Perforations - 1992 includes: Diana Lea as Carol Webster
perforations
Xylem (water-conducting cells) are dead (no cytoplasm), and form long tubes called vessels (no end walls) The walls are thickened with ligninPhloem (food transport cells) are living (have cytoplasm) There are two cell types - sieve tubes which conduct the food - they have end walls with perforations (sieve plates) and have no nucleus and companion cells - they don't conduct food but have a nucleus and they support the sieve tubes
perforations
greed??
Wood vessels are the thin "tubes / pipes" that transport the water in the stem (trunk) of a woody plant. They consist of many linked empty cells, the wood vessel members. These have perforations in the ends and link toghether to form long tubes, the wood vessels. Wood vessels carry water and minerals from the roots of a woody plant (a tree, for instance) to the leaves.
30020
2000 perforations in a tea bag
The brick with holes are called as perforated bricks. The holes are otherwise called as perforations. The perforations may be circular, square, rectangular. Generally these type of bricks are light weight and have high thermal insulation.
A dipper would dip dip as much as it want if a dipper would do dip.