B4 science topics 0.0 / 5 ? ScienceBiologyChemistryGCSEOCR Created by: Hollygordon1999Created on: 15-05-16 14:14 How does capture and recapture effect the organisms chance of survival? the marking makes them more viable to predators or makes them camoflague with their surroundings 1 of 11 What do detritivores do? feed on dead and decaying material, increase surface area, break up substances to smaller bits, speeds up decay 2 of 11 What are saprophytes? extracellular digeston, secret digestive enzymes, break down material, then absorbed by saprophytes 3 of 11 Explain the structure of the xylem vessels? made of dead cell, lumen down the middle, Thick walls (cellulose, plant support) carry water and minerals 4 of 11 Explain how stomata work? close automatically when unable to absorb water at roots, allow gases in and out, open during the day, close at night 5 of 11 What are guard cells? open and close the stomata (turgid or flaccid) 6 of 11 What is hydroponics? plants grown without soil, nutrient solutions (water and fertilizers) grown in barren soil. 7 of 11 What are the advantages and disadvantages of hydroponics AD = Minerals can be controlled, diseases can be controlled. DIS = fertilisers added, no support for plants 8 of 11 What did NEWLANDS (1864) do? every 8th element had similar properties (newland's octaves), pattern broke at TM, left no gaps, mixed up metals and non metals (critisied) 9 of 11 What is MENDELEEV (1869) do? put elements, atomic mass, had to leave gaps, predicted undiscovered elements. 10 of 11 What precipitates do the halide ions make? CHLORIDE = white. BROMIDE = cream. IODIDE = yellow 11 of 11
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