Flashcards
Additional Biology - Organisms in the Environment
Cards in this deck (25)
- 1The process for photosynthesis is.... Carbon dioxide is taken in by the leaves and water is taken up by the roots
. The chlorophyll traps the light energy needed for photosynthesis
. This energy is used to convert the carbon dioxide and water into glucose (a sugar) - 2What can we identify by testing leaves with iodine solution?We can identify the starch in the leaf and show that photosynthesis has occurred. Variegated leaves have patches of green (with chlorophyll) and white (without chlorophyll). Only the green patches will turn the iodine solution blue-black to show that starch has been made.
- 3What is meant by the term 'limiting factor'?Factors that limit the rate of a reaction
e.g. temperature, pH, light levels (photosynthesis) - 4Limiting factor - carbon dioxideThe effect of increasing CO levels on the rate of photosynthesis at a particular light level and temp. Eventually another factor becomes limiting.
- 5Limiting factor - light intensityThe effect of light intensity on the rate of photosynthesis
- 6Limiting factor - temperatureThe rate of photosynthesis increases steadily with a rise in temperature. After this, enzymes are destroyed and the reaction stops
- 7Independent variableThe one being tested
- 8Dependent variableThe one you measure
- 9The glucose produced by photosynthesising may be.... Converted into insoluble 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. - 10What is meant by the term 'mineral ions'?Chemical needed in small amounts as part of a balanced diet to keep the body healthy
- 11What is meant by the term 'nitrate ion'?Ion that is needed by plants to make proteins.
- 12What is meant by the term 'biomass'?Biological material from living or recently living organisms.
- 13What factors must be controlled in a greenhouse to improve plant growth?. Temperature
. Light intensity
. The amount of carbon dioxide available. - 14Physical factors that may affect the distribution of organisms are:Temperature
Availability of nutrients
Amount of Light
Availability of water
Availability of oxygen
Availability of carbon dioxide - 15Affecting the distribution of organisms - TemperatureFor example, Arctic plants are small which limits the number of plant eaters which can survive in the area.
- 16Affecting the distribution of organisms - availability of nutrientsMost plants struggle to grow when mineral ions are in short supply and again few animals will survive in that area.
- 17Affecting the distribution of organisms - amount of lightFew plants live on a forest floor because the light is blocked out by the trees. Shaded plants often have broader leaves or more chlorophyll.
- 18Affecting the distribution of organisms - availability of waterWater is important for all organisms so few will live in a desert. If it rains in the desert then plants grow, produce flowers and seeds very quickly. Then there will be food for animals.
- 19Affecting the distribution of organisms - availability of oxygenwater animals can be affected by the lack of oxygen. Some invertebrates can live at very low oxygen levels, but most fish need high levels of oxygen dissolved in water
- 20Affecting the distribution of organisms - availability of carbon dioxideLack of carbon dioxide will affect plant growth and consequently the food available for animals
- 21What is meant by 'quantitative sampling'?Sampling that records the numbers of organisms rather than just the type
- 22What is a 'transect'?A measured line or area along which ecological measurements (e.g. quadrats) are made
- 23What is a 'quadrat'?A piece of apparatus for sampling organisms in the field
- 24What is meant by 'sample size'?The size of a sample in an investigation
- 253 points for checking how valid data is?Reliable
Repeatable
Reproducible
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- GCSE Science Flashcards on Additional Biology - Organisms in the Environment, created by Oliviax on 18/04/2015.
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