Lab Exercis 6 Flashcards
What molecules move furthest up chromatography strip?
Pigments with fewer polar groups are more soluble in the non-polar solvent, and less attracted to polar paper, so they migrate farther.
What is the structure of chloroplast?
Photosynthetic pigments are embedded in the thylakoid membranes, organized into grana. The fluid surrounding the grana is the stroma.
What makes up the lead structure?
Epidermis, palisade, spongy mesophyll, and xylem and phloem, and guard cells.
What is the cell in the epidermis that contains chloroplasts?
Guard cells.
What is the function of guard cells?
Surround the strona and regulate opening and closing if stromata, to facilitate exchange of gases.
Where does the majority of photosynthesis occur in cell layers?
Palisade mesophyll and spongy mesophyll.
What it the function of xylem?
Transport water from roots to plant.
What is the function of phloem?
Transport food and nutrients from leaves to rest of plant.
What colour pigment leaves the leaf when placed in heat?
Red pigment.
What pigment is extracted in alcohol?
Green.
What is the pigment solubilty?
Soluble in alcohol.
What compound reacts with iodine? What colour results in a positive reaction?
Starch. A deep blue black colour.
What organelle stores starch?
Amyloplast.
Why doesnt one of the leaves react with iodine?
The plant isnt photosynthesizing therefore it is not producing glucose or starch.
What is chromatography?
Separates the pigments in a mixture in the basis of their polarities.
