ASIM K8 Lab: Estimating # of Stomata in a Lettuce Leaf

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Presentation transcript:

ASIM K8 Lab: Estimating # of Stomata in a Lettuce Leaf By: Lisa M. Clark TCHS

Stomata Structure Tiny pores located on bottom of leaf Oval shaped Look a little bit like cat eyes! Two kidney-shaped cells (guard cells) are found on each side of the stomata. Chloroplasts are also found in the guard cells. Function Release extra water from the leaf (called transpiration!) Take in carbon dioxide Release oxygen Guard cells swell & shrink to control the opening & closing of stomata Chloroplasts within guard cells carry out photosynthesis.

Click to the next slide to view a video that explains and shows the function of stomata.

The underside of a leaf (not enough magnification to see the stomata). 100X Total magnification A magnified section of the leaf you see in figure b. Notice there are about 18 stomata. b) 40X Total magnification The underside of a leaf (not enough magnification to see the stomata). http://www.pnas.org/content/101/4/918/F1.large.jpg

This picture also shows the lettuce leaf’s lower epidermis (~400X) http://www.lima.ohio-state.edu/biology/images/stoma.jpg The labeled parts are what you will identify in lab.

Lower Leaf Epidermis (~1000X) This picture shows a plant leaf’s lower epidermis under the microscope. Look carefully at the labeled parts. These are the parts that you will label during lab. www.tutorvista.com/.../protective-tissues.php

Labeled diagram of stomata & surrounding guard cells http://image.tutorvista.com/content/plant-water-relations/stomatal-movement--dicot-plants.jpeg