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Edexcel Biology GCSE - Photosynthesis Part 1

Biology25 CardsCreated about 1 month ago

This deck covers key concepts and definitions related to photosynthesis, including the roles of chlorophyll, enzymes, and various plant structures. It also includes the photosynthesis equation and factors affecting the process.

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algae definition

A group of organisms that photosynthesise but lack the complex range of cell types and organs found in land plants. Most algae are aquatic. All have chloroplasts.
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Key Terms

Term
Definition
algae definition
A group of organisms that photosynthesise but lack the complex range of cell types and organs found in land plants. Most algae are aquatic. All have c...
biomass definition
The dry mass of an organism.
carbon dioxide definition
A gaseous compound of carbon and oxygen, which is a by-product of respiration, and which is needed by plants for photosynthesis.
cell definition
Basic unit of life. Unicellular organisms only have one cell. Multicellular organisms have many cells.
chlorophyll definition
The green chemical inside the chloroplasts of plant cells. It enables photosynthesis to take place.
chloroplast definition
Contains the green pigment chlorophyll; the site of photosynthesis.
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Edexcel Biology GCSE - Photosynthesis Part 1
TermDefinition
algae definition
A group of organisms that photosynthesise but lack the complex range of cell types and organs found in land plants. Most algae are aquatic. All have chloroplasts.
biomass definition
The dry mass of an organism.
carbon dioxide definition
A gaseous compound of carbon and oxygen, which is a by-product of respiration, and which is needed by plants for photosynthesis.
cell definition
Basic unit of life. Unicellular organisms only have one cell. Multicellular organisms have many cells.
chlorophyll definition
The green chemical inside the chloroplasts of plant cells. It enables photosynthesis to take place.
chloroplast definition
Contains the green pigment chlorophyll; the site of photosynthesis.

denature definition

If a substance is denatured, its structure and function is altered. This can be caused by heat, altered pH or by chemical agents. enzymes.

endothermic definition
Reaction in which energy is taken in from the surroundings.
enzyme definition
A protein which catalyses or speeds up a chemical reaction.
glucose definition
A simple sugar used by cells for respiration.
light definition
Visible electromagnetic radiation.
limiting factor definition
A factor which, if in short supply limits or reduces the rate of photosynthesis, eg temperature, light intensity and carbon dioxide concentration.
organ definition
A group of different tissues that work together to carry out a particular function, eg heart and lungs.
photosynthesis definition
A chemical process used by plants to make glucose and oxygen from carbon dioxide and water, using light energy. Oxygen is produced as a by-product of photosynthesis. Algae subsumed within plants and some bacteria are also photosynthetic.
respiration definition
The chemical change that takes place inside living cells, which uses glucose and oxygen to release the energy that organisms need to live. Carbon dioxide is a by-product of respiration.
stomata definition
Tiny holes in the epidermis (skin) of a leaf. They control gas exchange by opening and closing and are involved in loss of water from leaves. Singular is stoma.
xylem vessels definition
Narrow, hollow, dead tubes with lignin, responsible for the transport of water and minerals in plants.
Photosynthesis overview
Green plants and algae use light energy to make glucose and oxygen from carbon dioxide and water. Temperature, carbon dioxide concentration and light intensity can affect the rate of photosynthesis.
Photosynthesis Algae
Algae can also make their own food by the process of photosynthesis. Plant biomass will increase as a result of photosynthesis.
Photosynthesis equation
Carbon dioxide + water →(light)→ Glucose + oxygen
Is photosynthesis a endothermic or exothermic reaction?
Photosynthesis is an endothermic reaction as it requires light energy to react carbon dioxide and water to produce glucose and oxygen.
Photosynthesis Chlorophyll
The light energy required is absorbed by a green pigment called chlorophyll in the leaves. Chlorophyll is located in chloroplasts in plant cells.
What is the main organ for photosynthesis?
Plant leaves are the main organ for photosynthesis.
Photosynthesis carbon dioxide
The carbon dioxide required for photosynthesis comes from the air. It enters leaves through the stomata. Water enters the plant through the roots, and is transported to the leaves in the xylem.
Photosynthesis oxygen
Oxygen is formed as a product. Some is used for respiration. During the day, provided the rate of photosynthesis is high enough, plant and algae give out oxygen.