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photosynt
| Question | Answer |
|---|---|
| what factors affect rate of photosynthesis | 1) Temperature 2)Light Intensity 3) CO2 levels |
| explain the diagram of the cross section of a leaf | waxy cuticle,upper epidermis,palisade mesophyll,spongy mesophyll,lower epidermis,stoma,guard cells,vascular bundle |
| Explain the light dependant reaction | involves the absorption of a photon of light passed from one molecule to the next till an electron is energised.Reaches reaction centre.Photolysis occurs which produeces oxygen and ATP and NADPH in form of energy loss.Some electron return to reaction c. |
| where does the light independent reaction get energy from | from the light dependant reactions as NADPH and ATP enter |
| what type of process is photosynthesis | its an anerobic process,taking smaller molecules and using energy to build a bigger molecule |
| what is photosynthesis | the process by which plants make their own food using light energy,converting light energy to chemical energy stored in the form of glucose. |
| where does photosynthesis take place | in the chloroplast,mesophyll cells of leaves |
| what does the inner and outer of the chloroplast do | the outer membrane acts as a barrier between the chloroplast and the cell and the inner membrane regulates the passage of molecules in and out of the chloroplast. |
| explain structure of thylakoids | flattened sacs on top of one another,this stack is called grana |
| what are the reactants in photosynthesis | 1) co2 and 2) Water |
| how is water absorbed and co2 | through the soil in the roots and co2 is absorbed through stomata |
| how is glucose formed | when carbon and oxygen atoms (from carbon dioixde) combine with hydrogen atoms |
| how is oxygen formed | is formed when water is split |
| whats a carbon sink | anything that absorbs more carbon than it releases |
| what does chlorophyll in the chloroplast do | traps sunlight which is used for photosynthesis |
| adaptations of leaves | 1 )large blades to absorbs as much light 2) Thin to so gas can pass easily up and down 3 ) large number of stomata |
| why is glucose used | to provide energy for plant and in return growth |
| suggest a way to increase the growth of plants in a greenhouse | increase concentration of co2,which will increase amount of glucose produced which increases growth of plant |
| what are the roles of ATP and NADPH from light dependant stage | ATP:supplies energy for the production of glucose NADPH:Supplies electrons and protons for production of glucose |
| what are the 2 products of the light independant stage | adenosine diphosphate and NADP |
| what 3 components are seen by the splitting of water | H+ ions or protons,oxygen and electrons |
| what do electrons and h+ ions | both used to make glucose |
| explain the light stage (light dependant stage ) thylakoids | Chlorophyll absorbs light energy,electron becomes energised and enter one of 2 pathways, |
| What happens in the first pathway of light stage | energised electron passes from elctron acceptor to electron acceptor and then back to reaction centre chlorpyll,releaseing energy to form ADP + P =ATP |
| what happens in the second pathway | energised electron pass from electron acceptor to electron acceptor and dont go back to recation centre C.Releases energy to form ATP,photoolysis occurs,of hydrigen,electrons and protons.electron return to chlorophyll,oxygen released and protons in thylak |
| what happens after pathway 1 and pathway 2 | low energy electrons join with NADP + to form NADP-,protons move to thylkaoid lumen to stroma via enzyme ATP SYnthase,which causes ATP formation caausing NADP- to form NADPH |
| what are the inputs and outouts for dark stag of photosynthesis | co2,ATP and NADPH and outputs:Glucose,ADP,NADP+ |
| the calvin cycle | ATP breaks down to ADP + P,NADPH breaks down to NADP+2e-,H+,carbon dioxide is converted to glucose with electrons and protons. |
| how could you vary the concentration of CO2 | use different concentrations of sodium hydrogen carbonate solution |
Created by:
jeromepomy