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Stack #4532825
| Question | Answer |
|---|---|
| What is Photosynthesis ? | Photosynthesis is the process by which plants, algae and some bacteria convert sunlight ,carbon dioxide, and water into sugars and oxygen. |
| What are the two stages of photosynthesis ? | Light -dependent stage and Carbon Fixation ( Calvin cycle ) |
| Where does photosynthesis take place? | Both the light dependent stage and the carbon fixation stage take place in the chloroplasts of the cell. |
| What is Photolysis? | Photolysis is a process occurring in the chloroplast that results in a water molecule being split into hydrogen and oxygen . |
| What is the Calvin cycle? | The Calvin cycle is the second stage of photosynthesis in which carbon is fixed . kit s also known as the carbon fixation stage. |
| What is ATP synthase | ATP synthase is an enzyme that catalyses the synthesis of of ATP from ADP and inorganic phosphate |
| What is chemiosmosis? | Chemiosmosisis the process by which ions particularly hydrogen ions move across a semi permanent membrane down their electrochemical gradient leading to the production of ATP |
| What is a primary electron acceptor? | A molecule that first receives electrons during the process of photosynthesis particularly in the electron transport chain. It plays a crucial role in converting light energy into chemical energy |
| How is NAPDH made? | Hydrogen is bound to co enzyme NAPD to make NAPDH |
| What is the electron transport chain ? | The electron transport chain is a series of carrier proteins attached to the inner membrane of the mitochondrion |
| What does the electron transport chain do? | The electron transport chain provides energy for synthesis of ATP by chemiosmosis |
| What is the carbon dioxide acceptor at the start of the Calvin cycle? | RuBP - Ribulose biphosphate |
| What does the enzyme RuBisCo do during the Calvin cycle? | The enzyme RuBisCo fixes carbon. dioxide by attaching it to RuBP =Ribulose Biphosphate |
| What intermediate compound is formed during the Calvin Cycle? | 3 phosphoglycerate - 3PG |
| What happens when 3PG becomes phospherabted by ATP? | It creates Glyceraldehide -3-Phosphate - G3P |
| How is G3P used? | G3P is used to synthesise glucose and some is used to regenerate RuBP ( the carbon dioxide receptor at the beginning of the cycle |
| State the pigments that absorb most of the light in photosynthesis ? | Chlorophyll a and b |
| Explain the difference between an absorption and action spectrum? | Absorption spectrum - shows the wavelengths of light absorbed by each pigment. Action spectrum shows how good the wavelength light affects the relative rate of photosynthesis |
| State the two molecules produced during photolysis that are essential for the Calvin cycle? | ATP and NADPH |
| Name the enzyme that catalyses the reaction between carbon dioxide gas and RuBP? | RuBIsCo |
| State two possible fates of glyceride- 3 - phosphate produced in the Calvin | Production of glucose and regeneration of RuBP |
| Name the hydrogen carrier in photosynthesis? | NADP |
| How does oxygen move through the plant cells? | by diffusion and exits the leaf through the stomata |
| What are carotenoids? | pigments that extend the wave lengths of light absorbed and pass the absorbed energy to the chlorophyll for photosynthesis |
| What is the chloroplast ? | cell organelle containing small circular chromosomes . Site of photosynthesis |
| On a leaf - what is the purpose of the waxy cuticle? | its waterproof and protects the leaf? |
| What is the role of the upper epidermis? | the transparent cells allow light in to transmit to the palisade. |
| What happens in the palisade? | its the site of photosynthesis due to elongated cells containing lots of chloroplasts |
| What happens in the spongy mesophil? | it contains air spaces , CO2, H20 vapour and O2 diffuse in and out of the leaf |
| What does the lower surface of the leaf contain? | guard cells |
| What is the role of Chloroplasts? | They open and close and control gas movement in and out of the leaf. |
| What are stomata? | a pore on the underside of the leaf controlled by guard cells - the pores are open by day and closed by night |
| What is the role of the xylem and phloem ? | transport H20 from the root and move sugar round the plant once its been produced in the leaf |
| How much absorbed ight is used for photosynthesis , how much is absorbed overall , how much is reflected and how much is transmitted ( diagram) * | 4% for photosynthesis, 83% absorbed overall, 12% reflected and 5% transmitted. |
| What are pigments ? | chemicals found in the chloroplastthet can absorb light of different wave lengths |
| Where in the spectrum is the rate of photosynthesis the highest? | blue and red ends of the spectrum where most light is absorbed by by green plants. |
| where is there less photosynthetic activity ? | in the yellow and orange parts of the spectrum due to some absorption of these wave lengths of light buy carotenoid pigments |
Created by:
ZilB18