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Edexcel Biology Gcse - Plant Hormones Part 1

Biology20 CardsCreated about 1 month ago

This deck covers key concepts related to plant hormones, tropisms, and related biological processes as outlined in the Edexcel Biology GCSE curriculum.

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positive gravitropism definition

when a root grows in the direction of the force of gravity
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Key Terms

Term
Definition
positive gravitropism definition
when a root grows in the direction of the force of gravity
negative gravitropism definition
when the stem grows against the force of gravity
auxins definition
Plant hormones that control cell elongation.
diffusion definition
The movement of molecules from an area of higher concentration to an area of lower concentration.
dormancy definition
Hibernation for seeds which stops when they germinate.
ethene definition
The simplest alkene, consisting of two carbon atoms joined by a double bond, surrounded by four hydrogen atoms.
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Edexcel Biology Gcse - Plant Hormones Part 1
TermDefinition
positive gravitropism definition
when a root grows in the direction of the force of gravity
negative gravitropism definition
when the stem grows against the force of gravity
auxins definition
Plant hormones that control cell elongation.
diffusion definition
The movement of molecules from an area of higher concentration to an area of lower concentration.
dormancy definition
Hibernation for seeds which stops when they germinate.
ethene definition
The simplest alkene, consisting of two carbon atoms joined by a double bond, surrounded by four hydrogen atoms.
geotropism definition
Growth of plant roots downwards as a result of gravity.
germination definition
The process where seeds sprout and begin to grow.
gibberellin definition
A plant hormone involved in germination, flowering and fruit formation.
hydrocarbon definition
A compound that contains hydrogen and carbon only.
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.
phototropism definition
Growth of plant shoots towards the light.
plant hormones definition
Substances that can modify or control the growth of plants.
stimulus definition
Any change in the environment that can be detected by receptors in an organism.
tropism definition
Plant growth response to light, gravity or water.
Why have plants developed tropisms?
In order to survive, plants require light and water for photosynthesis. They have developed responses called tropisms to help ensure they grow towards adequate sources of light and water.
There are two main types of tropisms:
positive tropisms - the plant grows towards the stimulus - negative tropisms - the plant grows away from the stimulus
What is phototropism?
Phototropism is the growth of plant shoots towards the light.
Responses to stimuli of different parts of the plant
In the plant stem, responses to light are known as a positive phototropism, which means the stem grows towards the light. In the plant root, responses to light are known as a negative phototropism, which means the root grows away from the light.
Auxins What are they
Auxins are a family of plant hormones. An example of a specific auxin is IAA, which is known as Indole acetic acid.