Criado por J yadonknow
quase 7 anos atrás
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Questão | Responda |
What are the direct effects of CO2 on plants? | C3 plants respond positively to increased CO2 by increasing photosynthesis Common response in plants is to increase their C:N ratio Reduced transpiration due to partial closing of stomata |
How do C3/C4 plants react to a double in CO2 ppm? | C3= 40% increase C4= 20% increase C3 tend to be weeds |
What important factor may limit carbon fixation? | Nutrient supply, soil must be fertile or photosynthesis will be limited. |
What sort of plants are C3/C4 plants? | Barley/oats/wheat Bermuda grass, corn |
What negative effects does CO2 increase have on commercial crops? | There's increased competition from weeds, so more herbicides are used, and less produce is churned out. |
Why can't agriculturists say the definite effect of CO2 increase on plants? | As growth response to increasing [CO2] varies within even a species due to differing genotypes. |
What is the indirect effect on plants? | Leaves of plants are generally thicker and contain more starch Plants also have more carbon based defences against herbivores. |
What is the indirect effect on insects? | Insects end up nitrogen deficient due to increased C:N ratios and therefore have to consume more plants. |
What happens to insect distribution as a result of global warming | Butterfly activity peaks earlier due to temperature changes |
What effect does it have on species like Cyclamen sp.? | Huge loss of land covering, habitat shrink, change in distribution of biota. |
What are the effects of agriculture? | Negative effects are partially compensated by an increase in productivity due to the fertilisation effect of increased CO2. Overall, will cause a 5% decrease in global cereal production. Increased disparity in cereal production between developed and less developed countries Developed increase 5%, less developed decrease 10% Northward movement of crops |
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