Plant hormones with growth and development

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  • Created by: exam yes
  • Created on: 16-01-19 20:09
What are plant hormones? and how much of them are there?
Organic compounds that bring about responses that are associated with growth and develoment. These hormones are at very low concentrations but are essential for the plants survival.
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How and where does the plant body develop and what is found at these areas?
A plant develops by producing repeated units of its body plan which originate at the shoot and apical meristem where stem cells are found.
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What happens when stem cells differentiate in the meristems and how are hormones involved?
As the stemm cells differentiate the shoot or roots may elongate. Hormones play a role in this cell signalling process by triggering cell division and thus growth.
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What do Gibberellins and auxin stimulate? But what does auxin also prevent?
A group of hormones called Gibberellins promotes mitosis and shoot elongation where auxin hormones stimulate root production. When auxins are at higher concentrations however, further root developmment and elongation is prevented.
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What do auxins citribute to as the plant further grows and develops?
As a plant further develops, auxins play a role in shoot tropic movement.
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What happens when light shines at one side or at an angle to the stem? What is this scientificaly and what does this do to the look of a plant?
Cell expansion is stimulated at the oppposite darker side due to auxin accumulation here. This is phototropism where auxins cause the stem tip to grow toward the light source. The stem may appear to bend as the darker side grows more than the lighter
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What hormone is first involved in the development of fruit / flower bearing plants and their eventual death?- Give a detailed example
Firstly, ethylene stimulates gruit ripening in climacteric fruits such as tomatoes where they change color from green to red.
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How is Ethylene succesful is fruit ripening and why?
The sudden production of ethylene gas in on eplant can trigger a response in surrounding plants due to its diffusive properties
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Other than stimulating fruit ripening in climacteric plants what is another role of the hormone ethylene? (what is leaf abscission?)
Ethylene also induces leaf abscission where chlorophyll degrades and leaves shed from the tree
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What different group of hormones works against ethylene in leaf abscission?
Anther group of hormones called cytokinins works against this where they prevent leaf abscission and senescence
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What is flower senescence?
ageing of flowers, fruit and leaves
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Other cards in this set

Card 2

Front

How and where does the plant body develop and what is found at these areas?

Back

A plant develops by producing repeated units of its body plan which originate at the shoot and apical meristem where stem cells are found.

Card 3

Front

What happens when stem cells differentiate in the meristems and how are hormones involved?

Back

Preview of the front of card 3

Card 4

Front

What do Gibberellins and auxin stimulate? But what does auxin also prevent?

Back

Preview of the front of card 4

Card 5

Front

What do auxins citribute to as the plant further grows and develops?

Back

Preview of the front of card 5
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