10 Questions
Explain the role of ethylene in fruit ripening.
Ethylene is a gas released during fruit ripening that causes the cell wall to break down, making the fruit softer, and releases stored sugar, making the fruit sweet. It also accelerates the ripening of other fruits through a chain reaction.
What is the major job of ethylene in plants?
The major job of ethylene in plants is fruit ripening. It acts as a gas that breaks down the cell wall, making the fruit softer, and releases stored sugar, making the fruit sweet. It also accelerates the ripening of other fruits through a chain reaction.
How does ethylene affect the ripening of other fruits?
When a fruit, such as a banana, ripens and releases ethylene, the gas accelerates the ripening of other fruits placed nearby. This creates a chain reaction, causing the other fruits to release more ethylene and ripen faster.
What mnemonic technique does the speaker suggest for remembering the function of ethylene?
The speaker suggests using a mnemonic technique of associating the word 'ethylene' with 'eat thai' and visualizing eating spicy Thai food that causes gas release, which then ripens a banana. This helps in remembering that ethylene is a gas and a fruit ripening hormone.
Name one function of auxin in plants.
Auxin causes cell elongation in plants.
Where is gibberellin concentrated in plants and what does it promote?
Gibberellin is concentrated in the nodes where new leaves are formed, and it promotes stem elongation in plants.
How can gibberellin be used to modify the growth of plants?
Gibberellin can be artificially sprayed on dwarf plants to make them grow taller.
Explain the major function of gibberellin in plants and provide an example of how its excess can negatively impact plant growth.
Gibberellin's major function is in stem elongation. An example of its excess negatively impacting plant growth is when excess gibberellin from a fungus caused rice plants to grow taller and eventually die.
What is the main role of cytokinin in plants, and how does it contribute to plant growth?
The main role of cytokinin in plants is cell division, which is essential for plant growth. Cytokinin is responsible for creating new cells and causing branching to occur in plants.
What are the functions of abscisic acid in plants, and how does it contribute to plant survival in challenging environmental conditions?
Abscisic acid is a growth inhibitor in plants, and its functions include maintaining closed stomata during drought, preventing seed germination in certain conditions, and contributing to plant survival in challenging environmental conditions, such as deserts.
Study Notes
Plant Hormones: Auxin, Gibberellin, Cytokinin, and Abscisic Acid
- Jay Berlin's discovery linked to gibberellin and stem elongation
- Excess gibberellin from fungus caused rice plants to grow taller and die
- Gibberellin's major function is in stem elongation
- Cytokinin's main role is cell division in plants
- Cytokinin responsible for creating new cells, essential for plant growth
- Cytokinin also causes branching to occur in plants
- Cytokinin's name derived from "cell division"
- Abscisic acid is a growth inhibitor in plants
- Abscisic acid's function includes maintaining closed stomata during drought
- Abscisic acid prevents seed germination in certain conditions, e.g., desert
- Abscisic acid's wilting of leaves association is not entirely accurate
- Abscisic acid's name association with "cutting down" and visual mnemonic for remembering its function
Test your knowledge of plant hormones with this quiz on auxin, gibberellin, cytokinin, and abscisic acid. Learn about their functions, roles, and the discoveries related to their effects on plant growth and development.
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