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Home > All Images > 1987 > April > 10 Apr 1987

Images Dated 10th April 1987

Choose from 9 pictures in our Images Dated 10th April 1987 collection for your Wall Art or Photo Gift. All professionally made for Quick Shipping.

Closed and open stomata on tobacco leaf Featured 10 Apr 1987 Image

Closed and open stomata on tobacco leaf

Scanning electron micrograph of an closed (at left) and open stoma on the surface of a tobacco leaf Nicotiana tabacum. Stomata are breathing pores scattered over the leaf surface, & sometimes stem, that regulate the exchange of gases between the leaf's interior & the atmosphere. Stomatal closure is a natural response to darkness or drought as a means of conserving water. Each pore is controlled by the turgor of two guard cells on either side of it; when they are full of water the pore is open; when they lose turgor, the pore closes. Magnification X2200 (at 10x8 size)