OCR A LEVEL BIOLOGY BIODIVERSITY | 65 Questions with 100% correct Answers | Verified

Abiotic Factors - Rainfall pH Temperature Humidity/lack thereof Presence/level of pollution Areas with high biodiversity (7) - - Large number of successful species - Relatively benign climate with more ecological niches - Presence of many species - Few specific adaptations to enviroment - Complex food web - Change in enviroment has a relatively small effect on the ecosystem as a whole -High biodiversity index (above 0.5) Areas with low biodiversity (7) - - Few successful number of species - Stressful/extreme enviroment with few ecological niches - Relatively few species live in the habitat- Very specific adaptations to the enviroment - Simple food webs - Enviromental change has a major effect on the ecosystem as a whole - Low biodiversity index (below 0.5) Methods of sampling animals (6) - - Pooter - Sweep net - Pitfall traps - Tree beating - Kick Sampling - Quadrats (for slow moving animals) Methods of sampling plants (2) - - Frame quadrat - Point quadrat pooter (5) - - Used to catch small insects - Insects drawn into the holding chamber via the inlet tube -Filter before the mouthpiece prevents them being sucked in by the mouth Sweep net - Used to catch insects in areas with long grass. Pitfall traps - - Used to catch small, crawling inverterbrates e.g. beetles, slugs, spiders etc - Hole dug into ground which insect falls into. - Must be deep enough so that the insects cant crawl out. - Trap must be covered so it doesnt fill up with rainwaterKick sampling - - Used to study organisms living in a river - River bank and bed is 'kicked' for a period of time to disturb the substrate - A net is held downstream for a set period of time in order to catch any organisms released into the flowing water.