Biology B2.2

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This is taken from an AQA revision guide and is made to help me revise efficiently.
Jade Allatt
Flashcards by Jade Allatt, updated more than 1 year ago
Jade Allatt
Created by Jade Allatt almost 9 years ago
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Resource summary

Question Answer
During photosynthesis light energy is transferred into .... Chemical Energy
Carbon Dioxide + Water = Glucose + Oxygen
Chlorophyll in chlorplasts absorb .... Light energy
What is the process of photosynthesis? Carbon Dioxide is taken in by the leaves and water is taken up by the leaves. the chlorophyll in the chloroplast traps the light energy. This energy is then used to convert carbon dioxide and water into glucose.
What can be used to test leaves for starch? Iodine
What are limiting factors of plants photosynthesising? Lack of light: light provides the energy so the rate of photosynthesis would decrease. Cold: enzymes don't work efficiently s it slows down the rate. Too little carbon dioxide: this can occur in an enclosed space.
Plant and Algal cells produce glucose during.... Photosynthesis
How do plants use glucose? Converted into soluble starch for storage. Used for respiration. Converted into fats and oils for storage. Used to produce cellulose which strengthens cell walls. Used to produce proteins.
Plants and algal cells need.... such as .... to produce protein. Mineral ions such as nitrate ions
What are three substances used for storage in plants. Insoluble starch Fats Oils
The distribution of organisms is effected by... Environmental factors.
What are the physical factors that may affect the distribution of organisms? Temperature. Availability of nutrients. Amount of light. Availability of water. Availability of oxygen and carbon dioxide.
Why are there so few animals living in very cold conditions such as the Arctic? The plants there are very small so there is very little for animals to eat.
What two ways can quantitative data be obtained? Random sampling using a quadrat. Sampling along a transect.
What is a quadrat? A square frame which may be subdivided. They are used by randomly placing them in the chosen area and counting the the amount of organisms in each one.
What is a transect? A transect is not random. A line is marked between two points and then quadrats are placed along it. Physical factors can as be measured at each quadrat point.
What is the result of the iodine test for starch? The regions with starch will turn blue/black and the regions without starch will turn brown/yellow.
What is meant by reproducible results? When the investigation can be repeated by a different person or with different equipment and have similar results
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