Ground Tissue continued:Stomata - in epidermis of leaf and some stems, are tiny pores between guard cells - minimizes water loss, allow gas exchange.

Mesophyll - ground tissue of a leaf, for gas exchange and photoshythesis

???Can you name all parts of this leaf below ??? Label them!

Upper epidermis, Lower epidermis, Mesophyll, Cuticle, Vein, Xylem, Phloem, Guard cells, Stomata, Palisade Layer, Spongy layer

• What kind of plant organ is this, monocot or dicot, and why? ______________________________________________________________________________________

• Review the structure of a flower, left.

• Go over life cycle of an angiosperm, below.

• This diagram shows how the male gametophyte (pollen) and female gametophyte (embryo within ovule) develop.

• The ovary may contain several ovules; only 1 is shown here.

• Please go over Steps 1-3 for the male and for the female on the diagram above. Males have ____surviving cells; females have ___.

• Above diagram shows pollination and double fertilization steps:

1. Pollination

2. Pollen form 2 sperm

3. Sperm travel through a pollen tube to ovule

4. Double fertilization occurs: – one sperm fertilizes egg forming diploid zygote which becomes the embryo;

– other sperm joins to form the triploid central cell, which develops into endosperm, nourishing the embryo