11957063
Description
Flashcards by J yadonknow, updated more than 1 year ago
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Created by J yadonknow
almost 7 years ago
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| Question | Answer |
| 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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