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What part of plant cell is important in plant nutrition?
LEAVES are specialized organ for photosynthesis
Leaves --- it is site of photosynthesis stomata --- tiny opening of a leaves that allow carbon dioxide and oxygen to pass through and allow oxygen as a waste product to exit the leaf.
Grana ----granum stomata --- stoma
CHLOROPHYLL --- absorbs and traps sunlight
PHOTOSYNTHESIS--- (Greek word photos = light; synthesis= putting together)--- process by which plant converts energy from the sun provide energy for all life forms.
6 CO2 6 H2O C6 H12O6 6 O2 Equation of Photosynthesis
1. Light –Dependent Stage --- requires light --- also known as photochemical light reaction/ photolysis --- takes place in the thylakoid membrane of the chloroplast --- involves two stages: Photosystem I and Photosystem II
NOTE: Light travel as a wave energy. Sunlight is a mixture of different wavelengths of light. Each wavelength has a particular color and an amount of energy. When sunlight strikes the leaf of a plant, the light wave energy is absorbed by the chlorophyll. It absorbs most of the color and reflects green and yellow light.
PHOTOSYSTEM--- are arrangements of chlorophyll and other pigments packed into thylakoids.--- transfer the energized electron transport chain.
The electron in the Photosystem II provide the energy to make ATP The electron in the Photosystem I reduce the coenzyme NADP+ to NADPH
Photosystem II regains electrons by splitting water and releasing oxygen humans and animals need to survive.
2. LIGHT-INDEPENDENT STAGE --- the formation of glucose from carbon dioxide, does not directly requires light. --- Dark Reaction Stage/ Calvin Cycle/ Calvin-Benson Cycle --- named after Melvin Calvin and Andrew Benson --- takes place in the stroma of the chloroplast
MELVIN CALVIN --- famous of his experiment of the chemical process of photosynthesis.
NOTE: – The light dependent stage of photosynthesis splits water and produces ADP and NADPH and Oxygen is the by-product. – The light independent stage of photosynthesis reactants are ATP, NADPH, CO2 Products: glucose, NADP,ADP and inorganic phosphate
Did you know that overwatering can be just asbad for plants as not giving them enough water.They get oxygen from the air spaces betweenparticles. When soil is filled with water, oxygen maynot reach the roots. If root cells do not haveenough oxygen for cellular respiration, theycannot produce energy needed for cell activities
What do you think is the importance of photosynthesis?