B4 , B5 and B6

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Flashcards by cigirlrocks999, updated more than 1 year ago
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Created by cigirlrocks999 about 8 years ago
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Questions about B4 Higher Tier

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Question Answer
What is diffusion? It is the movement of particles from an area of high concentration to an area of low concentration.
What is water used for in plants? To keep leaves cool, for transporting minerals, to keep cells turgid and for photosynthesis.
What is lysis? It is when an animal cell gains water by osmosis and bursts.
What is xylem vessels used for? For transporting water and dissolved minerals.
What are phloem vessels used for? For moving food substances around the plant (translocation).
What is the structure of xylem vessels? They are hollow and have thick cellulose cell walls.
Which ecosystem has a bigger biodiversity, artificial or natural? Natural ecosysytem.
What is active transport? It is when substances are absorbed against a concentration gradient.
What are palisade cells? Plant cells which contain large amounts of chloroplasts.
What is meant by plasmolysed? When a plant cell loses lots of water.
What is glucose converted into in plants? Starch - for storage Cellulose - for cell walls
What is the process of photosynthesis? Light energy splits water into oxygen and hydrogen ions. Carbon dioxide reacts with the hydrogen to make glucose.
What are the limiting factors of photosynthesis? Temperature, Light intensity and Carbon dioxide concentration.
How are leaves adapted for photosynthesis? Thin, large surface area, waxy cuticle, palisade cells and air spaces.
What is the equation for population size using the capture/recapture method? No. in 1st sample X No. in 2nd sample ____________________________ No. in 2nd sample previously marked
What is meant by self-supporting? It can maintain it's self without any external inputs except an energy source, i.e the sun.
What is an ecosystem? It is a physical environment with a particular set of conditions, plus all the organisms that live in it.
What is a community? The populations of different
What is population? A population is the total number of individuals of the same species that live in a certain area.
How do you estimate an animal population? You catch the animals and record the number, mark them, release the animals for a period of time and get a second sample.
What are the asumptions made when using capture/recapture data? Do death, immigration, emmigration. You collect each sample the same way. The marks don't affect the animal's survival rate.
What is zonation? Zonation is the gradual change in the distribution of a species across a habitat.
What is osmosis? Osmosis is the net movement of water particles from a dilute area to a more conentrated one across a partially permeable membrane.
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