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IGCSE Biology: Plant nutrition — Practice Questions & Answers
Master photosynthesis, its equation, limiting factors and leaf structure for IGCSE Biology plant nutrition.
682 practice questions available for this topic — here are 10 with full answers and explanations.
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Practice questions with answers
1
Multiple choice · Easy
What is the main gas taken in by a leaf for photosynthesis?
Carbon dioxide
Oxygen
Nitrogen
Hydrogen
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Why Carbon dioxide is absorbed from the air and used to build glucose.
2
Multiple choice · Easy
Which gas is released as a waste product of photosynthesis?
Oxygen
Carbon dioxide
Nitrogen
Methane
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Why Oxygen is produced when water is split during the light-dependent stage.
3
Multiple choice · Easy
Which green pigment absorbs light energy for photosynthesis?
Chlorophyll
Haemoglobin
Carotene only
Melanin
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Why Chlorophyll captures light energy needed to drive photosynthesis.
4
Multiple choice · Easy
In which organelle does photosynthesis take place?
Chloroplast
Mitochondrion
Nucleus
Ribosome
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Why Chloroplasts contain chlorophyll and are the site of photosynthesis.
5
Multiple choice · Easy
What is the carbohydrate first made in photosynthesis?
Glucose
Cellulose
Protein
Lipid
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Why Glucose is the carbohydrate produced directly by photosynthesis.
6
Multiple choice · Easy
Which liquid is absorbed by the roots and used in photosynthesis?
Water
Oil
Sap sugar
Nectar
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Why Water is taken up by roots and supplies hydrogen for making glucose.
7
Multiple choice · Easy
What type of energy is converted into chemical energy during photosynthesis?
Light energy
Heat energy
Sound energy
Electrical energy
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Why Light energy is converted into chemical energy stored in glucose.
8
Multiple choice · Easy
Which chemical is used to test a leaf for the presence of starch?
Iodine solution
Limewater
Benedict's solution
Biuret reagent
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Why Iodine solution turns blue-black in the presence of starch.
9
Multiple choice · Medium
Why is a leaf boiled in ethanol before testing it for starch?
To remove chlorophyll so the colour change is visible
To add starch to the leaf
To kill bacteria on the leaf
To make the leaf produce oxygen
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Why Ethanol removes chlorophyll so the colour change with iodine can be seen clearly.
10
Multiple choice · Medium
A plant is left in the dark for 48 hours before a starch test. What is the purpose of this?
To remove existing starch so the leaf is destarched
To kill the plant before testing
To increase the chlorophyll content
To open the stomata fully
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Why Destarching ensures any starch detected afterwards was made during the experiment.
Key terms in Plant nutrition
Photosynthesis: The process by which plants make carbohydrates from carbon dioxide and water, using energy transferred from light absorbed by chlorophyll.
Autotroph: An organism, such as a green plant, that makes its own food (organic molecules) from inorganic raw materials rather than feeding on others.
Producer: An organism that produces its own food by photosynthesis and forms the start of a food chain.
Word equation for photosynthesis: Carbon dioxide + water -> glucose + oxygen, occurring in the presence of light and chlorophyll.
Balanced symbol equation for photosynthesis: 6CO2 + 6H2O -> C6H12O6 + 6O2, carried out in the presence of light and chlorophyll.
Raw materials of photosynthesis: The inputs needed to make carbohydrates: carbon dioxide and water.
Products of photosynthesis: The substances made during photosynthesis: glucose (carbohydrate) and oxygen.
Light energy: The energy from sunlight that is absorbed by chlorophyll and transferred to chemical energy in glucose during photosynthesis.
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