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Description
Flashcards by Ellie Potellie, updated more than 1 year ago
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Created by Ellie Potellie
over 5 years ago
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| Question | Answer |
| What Is Food Security? | Food security is the ability of human's population to access food of sufficient quality & quantity. |
| What Factors Need To Be Fulfilled For Food Production To Be Possible? | Food production must be sustainable and not degrade the natural resources |
| What Factors Do Agricultural Production Depend On? | Factors that control photosynthesis & Plant growth |
| What Factors Control Plant Growth? | •Breeding higher yielding cultivars •Use of fertilisers •Protection of crops from pests, disease & competition |
| Why Do Livestock Produce Less Energy Per Unit Of Area Than Crop Plants? | Du to loss of energy between tropic levels |
| How Do The Amount Of Organisms Affect The Energy Passed On? | The more organisms in a food chain the less energy is passed on |
| Where Is Livestock Possible? | Livestock production is usually possible in habitats not suitable for crop production |
| What Three Things Happen To Rays Involved In Photosynthesis? | They're; •Reflected - bounce of the leaf •Transmitted - Pass through the leaf •Absorbed - Used for energy |
| What Does The Absorption Spectrum Do? | An absorption spectrum shows the ability of different photosynthetic pigments absorption of different wavelengths of light |
| What Are The Main Photosynthetic Pigments? | •Chlorophyll A •Chlorophyll B |
| What Do Accessory Pigments Do? | They extend the wavelengths of light absorbed |
| What Are Accessory Pigments Called? | Cartenoids; •Xanthophyll •Carotene |
| How Do They Do This? | They absorb light energy & pass it to chlorophyll for photosynthesis |
| Where Does Chlorophyll Mainly Absorb Light? | In the blue and red regions |
| What Is An Action Spectrum? | An action spectrum shows the ability of photosynthetic pigments to bring about photosynthesis at different wavelengths |
| Why Is Photosynthesis Higher In Yellow/green Regions In Action Spectrums? | This is due to accessory pigments extending the wavelengths of light being absorbed |
| Where Does Photosynthesis Occur? | In The Chloroplast |
| How Many Stages Are In Photosynthesis? | Two; •Light Dependent Stage •Temperature Dependent Stage |
| What Type Of Light Can Be Used In Photosynthesis? | Absorbed Light |
| What Do Absorbed Light Do To Electrons In The Light Dependent Stage? | Absorbed light excites electrons in the pigment molecule |
| What Do The Electrons Do Once Excited? | The high energy electrons pass through an electron transfer chain. |
| What Do Electrons Do In The Electron Transport Chain? | They release energy & are used to regenerate ATP from ADP + Pi by ATP synthase |
| What Happens To Some Of The Energy? | Some energy is used to split water into hydrogen & oxygen |
| What Happens To Oxygen? | Oxygen is evolved and passes through the air |
| What Happens To Hydrogen? | Hydrogen is bound to the hydrogen carrier NADP forming NADPH |
| How Is 3-PG Formed? | CO2 is fixed To RuBP by the enzyme rubisco forming three-phosphoglycerate |
| How Is G3P Formed? | 3-PG is phosphorylated by ATP & combined with hydrogen from NADPH forming Glyceradelyde-3-phosphate |
| What Is G3P Used For? | G3P Is used to regenerate RuBP & in the synthesis of Glucose |
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