Flashcards · Biology · Photosynthesis
Uses of Glucose from Photosynthesis
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What are five uses of glucose in a plant?
Respiration, starch, fats and oils, cellulose, and amino acids for proteins.
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Why is glucose used in respiration?
To release energy for the plant's life processes.
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Why is glucose converted to starch for storage?
Starch is insoluble, so it does not affect osmosis, and it stores a lot in a small space.
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What is cellulose used for?
To strengthen the cell walls.
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Why are fats and oils stored in seeds?
They are a store of energy for the young plant.
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What does a plant need to make amino acids?
Glucose and nitrate ions.
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Where do nitrate ions come from?
They are absorbed from the soil.
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What are proteins made from?
Amino acids.
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What is the test for starch?
Add iodine solution. It turns blue-black.
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What is the test for glucose (a sugar)?
Add Benedict's reagent and heat. It turns green, yellow, orange or brick red.
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What is the test for protein?
Add Biuret reagent. It turns purple.
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What happens to iodine solution in the presence of starch?
Orange-brown to blue-black.
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Why do farmers add fertiliser?
To provide nitrate ions for plants to make proteins.
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Where do plants store starch?
In roots, tubers, seeds and fruits.
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How is glucose carried round a plant?
In the phloem.
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Name the use of glucose marked X and say what it does. Cellulose. It is made from glucose and strengthens the plant's cell walls.
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Name the five uses of glucose. 
Respiration (energy), starch (insoluble store), fats and oils (stored in seeds), cellulose (cell walls) and amino acids for proteins (with nitrate ions).