4773540
Flashcards by bronwyn831, updated more than 1 year ago
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Created by bronwyn831
about 5 years ago
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Description
| Question | Answer |
| give an example for a: secondary consumer primary consumer producer | hawk rabbit grass |
| why is energy lost throughout the food chain? | lost as waste products (faeces) lost in process of respiration |
| how is plant waste decayed? | by microorganisms |
| what conditions are needed for faster decompostion? | warm and moist and plenty of oxygen |
| why will a calf grow faster if kept indoors? | being inside will reduce energy lost moving around and because it doesnt need to heat itself |
| what is the source of energy for plants? | the sun |
| what is biomass? | dry biological material from any living/ recently living organism |
| what is respiration? | an exothermic reaction. releasing energy from food; most of which is wasted as heat |
| what is the equation for respiration? | glucose + oxygen = carbon dioxide + water (stored chemical energy) = energy released |
| what is the process of decaying and how does it happen? | the breaking down of dead biomass. decomposers (bacteria/fungi) feed on dead biomass and breaks it down, releasing CO2, minerals and energy. |
| what can affect the rate of decay? | temperature- enzymes work faster in warmth water/moist oxygen- most are aerobic pH- most need a neutral pH of 7 surface area: volume- have more surface to act on |
| name 3 pros and 3 cons of decay. | produces fertiliser, rid of waste, biofuels (biogas) food poisoning, bad smell, food spoils |
| explain the carbon cycle | 1. C = atmos: respiration and combustion 2. producers absorb CO2 to make carbohydrates during photosynthesis 3. C compounds > food chain: respiration = die 4. decomposers = return to atmos or C = fossil fuels ~ combustion ~ atmosphere |
| why are tight sealed boxes important for keeping food from decaying? | holes let oxygen in which decomposers such as bacteria, need to survive and reproduce |
| 2 advantages and 2 disadvantages of a landfill | not an eyesore, quick and easy to create poisonous gases, takes up agricultural land |
| 2 advantages and 2 disadvantages of a black bag | cheap and easy, low maintenance odorous, long process |
| 2 advantages and 2 disadvantages of a compost bin | use for fertiliser, in expensive, low maintenance pathogens transferred to soil ~ disease eyesore and odourous |
| 2 advantages and 2 disadvantages of a wormery | high quality, liquid and solid fertiliser high maintenance, certain biomass needed |
| 2 advantages and 2 disadvantages of a council collection | low maintenance, prevent organic material going to landfill expensive to run (people and machinery), traffic pollution in transportation |
| what has a higher SA:V elephant or a mouse? | elephant- looses heat slower, needs lower metabolic rate to keep itself warm |