nutrition in plants Flashcards
what is photolysis
light energy absorbed by chlorophyll is converted into chemical energy that splits water into hydrogen and oxygen, ATP and NADPH is formed
carbon fixation
ATP and hydrogen are used to fix carbon dioxide into organic molecules
experiment for photosynthesis
place plant in dark room for two days
-use KOH to remove CO2
fates of glucose formed during photosynthesis
-used immediately by plant cells for cellular respiration or formation of cellulose on cell walls
-converted into sucrose or starch in leaves, excess glucose is converted into sucrose and transported into storage organs as starch, in daylight excess glucose is converted into starch as temporary storage in the leaf, may be converted back into glucose or sucrose and night and
-used to form amino acids and proteins, glucose reacts with nitrates to form amino acids that combine with each other to form protein which make up new protoplasm in the leaf, excess amino acids are transported away for synthesis of protoplasm or storage as proteins
-used to form fats for storage, cellular respiration and synthesis of new protoplasm
NoV, Lamina, leaf arrangement and petiole
-NoV transports water and mineral salts to the cells in the lamina and carry manufactured food from these cells to other parts of the plants
-Lamina is flat and broad surface compared to its volume to maximise amount of sunlight for photosynthesis and carbon dioxide can rapidly reach the inner cells of the leaf
-leaves are organised around the stem in a regular pattern, grows in pairs or singularly in an alternate arrangement to ensure no leaves do not block one another so all of them receive optimum sunlight
-petiole holds the lamina away from the stem so that it can receive sunlight
palisade and spongy mesophyll layers
-presence of chloroplast, where most photosynthesis occurs
-closely packed together to maximise sunlight absorption
-not close packed forming intercellular air spaces that allow gas to move in and out
describe open stoma in sunlight
guard cells have chloroplast for photosynthesis, increasing potassium ion and glucose concentration, lowering water potential in guard cell that causes water to diffuse into it through osmosis, becoming turgid and swollen
-due to thicker inner cell wall and thinner outer cell wall, guard cell curves and pulls open stoma
why are most life forms dependent on photosynthesis
produces oxygen for respiration and forms to base of food chain by converting light energy into energy rich organic compounds
