They feed on dead matter Suggest one way in which microorganisms are involved in recycling phosphorus contained in the tissues of dead carnivores. They feed on dead matter Secreting enzymes and absorbing the products of digestion Which are used to produce new compounds such as ATP and nucleic acids

Nitrate is converted to nitrogen gas By denitrifying bacteria Explain how each of biological denitrification could account for falling nitrate concentration. Nitrate is converted to nitrogen gas By denitrifying bacteria The nitrogen gas is released into the atmosphere

Feed on leaf litter and increase its surface area Describe how nitrogen in compounds in a dead plant is made available for use by other plants. Detritivores Feed on leaf litter and increase its surface area Microbial saprophytes Secrete enzymes and absorb amino acids Which they deaminate releasing ammonia Nitrifying bacteria Convert ammonia to nitrite and then nitrate Which is absorbed by plant roots And transported through the xylem To be incorporated into amino acids

Nitrogen fixing bacteria in clover roots Explain why a mixture of ryegrass and clover has a higher yield than ryegrass alone. Nitrogen fixing bacteria in clover roots Convert nitrogen gas into ammonia compounds Which can be used by the clover plants to make amino acids Saprophytic bacteria Digest dead matter from the clover plants and release ammonia Nitrifying bacteria in the soil Convert the ammonia to nitrite and then nitrite Which the grass plants absorb and use to make amino acids for their growth

Feed on dead material and increase its surface area Nitrogen-fixing bacteria are described as providing “the first vital steps in making atmospheric nitrogen available to other living organisms”. Describe the role of microorganisms in making nitrogen in organic compounds in dead material from leguminous plants available to other plants. Detritivores Feed on dead material and increase its surface area Microbial saprophytes Secrete enzymes and absorb amino acids Which they deaminate, releasing ammonia Nitrifying bacteria Convert ammonia to nitrite and then nitrate Which is absorbed by plant roots And transported through the xylem To be incorporated into amino acids

heterotrophic nutrition deamination nitrification respiration photosynthesis denitrification heterotrophic nutrition deamination nitrification respiration nitrogen fixation combustion saprophytic nutrition autotrophic nutrition death and excretion

Feed on leaf litter and increase its surface area by excreting wastes Some of the carbon from carbon compounds in leaf litter is eventually incorporated into carbon compounds in newly grown leaves. Suggest what living processes might be involved in the recycling of carbon and describe the contribution each makes to the recycling. Detritivores Feed on leaf litter and increase its surface area by excreting wastes Microbial saprophytes Secrete enzymes and absorb products Releasing carbon dioxide from respiration Absorbed through stomata of mature leaves Photosynthesis produces glucose Which is transported as sucrose in phloem To new leaves where used to make cellulose and amino acids

They feed on dead matter Digesting part of it in their guts Describe how detritivores are involved in the recycling of nutrients. They feed on dead matter Digesting part of it in their guts Faeces contains undigested waste with a larger surface area Increasing the decomposition of dead matter by saprophytic micobes

Describe how the carbohydrates in the dead leaves in the beech wood would be recycled by the activity of detritivores and microorganisms. Explain how digestion of insects helps the sundew to obtain additional nitrogen compounds.