B4 - Decay 0.0 / 5 ? ScienceDecayGCSEOCR Created by: kaliSereneCreated on: 04-06-16 14:43 What are detritivores and what are some examples? Feed on dead and decaying material. Earthworms, maggots and woodlice are some examples. 1 of 17 How do detritivores increase the rate of decay? They break up the detritus which increases surface area for further microbial breakdown. 2 of 17 How can the rate of decay be increased? Increasing temperature, oxygen and water 3 of 17 What is the best temperature for bacteria to increase their rate of respiration? 37 degrees 4 of 17 What is the best temperature for fungi to increase their rate of respiration? 25 degrees 5 of 17 What will higher temperatures do to enzymes? Denature them 6 of 17 How does the amount of oxygen increase rate of decay? Bacteria will use aerobic respiration to grow and reproduce faster 7 of 17 How does the amount of water increase rate of decay? Will allow for material to be digested and absorbed more efficiently and increase growth and reproduction of bacteria and fungi. 8 of 17 What is a saprophyte? An organism that feeds on dead and decaying material 9 of 17 Why do fungi produce enzymes? To digest food outside their cells and then reabsorb the simple soluble substances. This type of digestion is called extracellular digestion. 10 of 17 What do food preservation methods do? Slow down decay 11 of 17 What happens in canning? Foods are heated to kill bacteria and then sealed in a vacuum to prevent entry of oxygen and bacteria. 12 of 17 What happens in cooling? Slows down bacterial and fungal growth and reproduction 13 of 17 What happens in freezing? Will kill some bacteria and fungi and slow down their growth and reproduction 14 of 17 What happens in drying? Removes water so bacteria cannot feed or grow 15 of 17 What happens in adding salt or sugar? Will kill some bacteria and fungi, as the high osmotic concentration will remove water from them 16 of 17 What happens in adding vinegar? Will produce very acidic conditions killing most bacteria and fungi 17 of 17
Comments
No comments have yet been made