To make glucose using light energy
Explication
Photosynthesis is the process by which plants make their own glucose using light energy. The other options describe respiration, water uptake, or storage rather than photosynthesis.
Light intensity
Explication
Light intensity is one of the key factors that affect photosynthesis, along with carbon dioxide concentration and temperature. The other choices are not given as main factors here.
It uses oxygen to release energy from glucose
Explication
Aerobic respiration uses oxygen to release energy from glucose. Lactic acid is associated with anaerobic respiration in muscles, not aerobic respiration.
Mitochondria
Explication
Respiration happens in mitochondria. The nucleus contains chromosomes, and chloroplasts are the site of photosynthesis.
A substance where elements are chemically joined together
Explication
A compound is made when elements are chemically joined together. A substance made from only one type of atom is an element, not a compound.
Columns
Explication
Groups are the columns of the periodic table, while periods are the rows. This layout is a key way the table is organised.
Gaining oxygen
Explication
Oxidation is defined here as a reaction in which a substance gains oxygen. Although oxidation can be defined differently in other contexts, that is not the definition used here.
A more reactive metal replaces a less reactive metal
Explication
In displacement reactions, the more reactive metal displaces the less reactive one from its compound. The opposite direction is incorrect.
The fraction of total input energy that becomes useful output energy
Explication
Efficiency is the useful energy output divided by the total energy input, usually expressed as a percentage. It is not the total energy or just the heat lost.
A dark matt surface
Explication
Dark matt surfaces absorb radiation best, while shiny surfaces reflect it. This is why dark matt surfaces are associated with better absorption of heat.
A magnet made when current flows through a coil of wire
Explication
An electromagnet is created when an electric current flows through a coil of wire. The other options describe unrelated ideas, including a parallel circuit.
It has a single path for current with one loop
Explication
A series circuit has one loop, so current follows a single path. A circuit with branches is parallel, not series.
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Photosynthesis — process?
Plants make glucose using light energy.
Chloroplasts — location?
Site of photosynthesis in plant cells.
Chlorophyll — role?
Absorbs light energy for photosynthesis.
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