Do Now - Review Identify the inorganic raw materials needed for photosynthesis. Identify the organic, energy-rich molecule synthesized during photosynthesis. Where does photosynthesis take place? Explain the difference between autotrophs and heterotrophs. Give an example of a heterotroph that doesn’t consume nutrients. Explain how guard cells help plants maintain homeostasis.
Regents Review Which life functions are directly regulated through feedback mechanisms associated with the actions of the structures labeled X? 1. excretion and immunity 2. digestion and coordination 3. circulation and reproduction 4. respiration and photosynthesis
Regents ReviewThe dissolved carbon dioxide in a lake is useddirectly by1. autotrophs2. parasites3. fungi4. decomposers
What was the equation forphotosynthesis? Light
Molecules/particlesneeded forphotosynthesis…Needed to be absorbed: 1. Carbon Dioxide 2. Water 3. Light Note: this is the limiting factorPart of the plant: 4. Chlorophyll a molecule in chloroplasts
Chlorophyll Molecule in chloroplasts that absorbs the light energy Pigments are light absorbing molecules Chlorophyll is the MAIN PIGMENT in plants
Chlorophyll Light spectrum is ROYGBIV Red, orange, green, blue, indigo, violet Chlorophyll absorbs RED and BLUE parts well AbsorptionDoes not absorb green light well – that’s why plants are green. Plants reflect green light!
Regents Review The graph represents the absorption spectrum of chlorophyll. The graph indicates that the energy used in photosynthesis is most likely obtained from which regions of the spectrum? 1. yellow and orange red 2. violet blue and green 3. orange red and violet blue 4. green and yellow
Factors Affecting Photosynthesis 1. Water Can slow/stop photosynthesis if not enough Dry environment plants have adaptations Ex: thick, waxy leaves
Factors Affecting photosynthesis 2. Temperature Enzymes in photosynthesis are best 0-35 Degrees C Above or below may denature enzymes At very low temp., photosynthesis can stop
Factors Affecting Photosynthesis 3. Intensity of light The more light, the more photosynthesis …To a certain point!!!!! There IS a maximum rate of photosynthesis At a certain temperature, more light will not increase photosynthesis
Regents ReviewA green plant is kept in a brightly lighted area for 48hours. What will most likely occur if the light intensity isthen reduced slightly during the next 48 hours?1. Photosynthesis will stop completely.2. The rate at which nitrogen is used by the plant will increase.3. The rate at which oxygen is released from the plant will decrease.4. Glucose production inside each plant cell will increase.
Regents Review If the process illustrated in the diagram is interrupted by a chemical at point X, there would be an immediate effect on the release of 1. chlorophyll 2. nitrogen 3. carbon dioxide 4. oxygen