When us eat a item of celery, we room eating the stem, or petiole of the plant. (see Fig. 1). The crunchiness the the stalk is because of the types of cells the are contained in celery tissue.

You are watching: When you are eating a celery stick, you are eating the tissue of a plant.


Fig. 1 The crunchy component of the celery that we eat is the stem of the plant. Photo from Thomé. Flora von Deutschland, Österreich und der Schweiz. 1885.

Besides xylem (water-conducting) and also phloem (food-conducting) tissues, which with each other are referred to as vascular bundles, celery consists of collenchyma tissue, which gives support for the plant. Collenchyma organization is consisted of of elongated living cell filled with water, and also the press of the water against the cell wall surfaces creates a stiffness that gives celery that is crunch.

Collenchyma is found in plant stems, leaves and also flowers. ~ above a stem that celery the collenchyma organization is situated on the ribs along the exterior of the stalk and also on the within (Fig. 2).


Fig. 2 Close up of celery mirroring the darker green collenchyma tissue follow me the outer edges of the stalk and the vascular bundles. Photo by Fir0002/Flagstaffotos, courtesy of Wikimedia Commons and also the GNU free Documentation License.

Plant anatomist Katherine Esau studied the framework of organization in celery. Her photos below show a cross ar of a celery stalk. The collenchyma tissue creates the spicy ribs along the bottom, and also the vascular bundles above it look like upside-down acorns.


Left: Cross section of celery petiole, x11. Right: Cross ar of celery petiole. Picture by Katherine Esau.

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Why go a pear feeling gritty when you chew it?

Pear fruit has schlerenchyma tissue created of sclereid cells. The origin of the cells" name derives native the Greek word sklerosis, an interpretation "hardening." The cells have a second cell wall surface filled v lignin, an organic problem that gives support and hardens the tissue. Sclereids are uncovered throughout plenty of plants and also are what do a nut, shell, or apple particle hard. Lock are additionally located throughout the fleshy component of the pear fruit and also are sometimes called "stone cells."


Cross ar of a pear, x6.5 times. Photograph by Katherine Esau.

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