The narrow, elongated, hollow cells that make up xylem tissue of plants allow for a. the production of glucose by photosynthesis. b. pollination of flowers by insects. c. the longterm storage of starch for future energy requirements. d. the transport of water and ions.

The answer is; D

These cells are called plasmodesmata. They are significant in the symplastic flow (meaning through the cytoplasm) of water and other molecules in the plant. A membrane called desmotubule runs along the pores of adjacent plasmodesmata. These cells are also significant in the communication between cells.

when the displaced particles are perpendicular to the direction the wave travels, is called a transverse wave, whereas in longitudinal wave the displace practices are parallel to the direction of the wave.

in the given image:

first image shows - longitudinal wave

second image shows - transverse wave

third image shows - longitudinal wave

fourth image shows - longitudinal wave