False colour scanning electron micrograph of open stomata on the surface of a tobacco leaf Nicotiana tabacum. Stomata are breathing pores scattered over the leaf surface,and sometimes stem,that regulate the exchange of gases between the leaf's interior and the atmosphere. Stomatal closure is a natural response to darkness or drought. Each pore is controlled by the turgor of two guard cells on either side; when the guard cells are full of water the pore is open; when they lose turgor,the pore closes. Some of the pores here are still growing and are small. A large glandular trichome,or leaf hair,is also seen. Magnification: X 100 at 35mm size. Original is BW print b745/167 | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Burgess, Dr. Jeremy |
Taille de l’image : | 3557 px × 2480 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |