20 Questions
What is the name of the type of tropism where the growth response is towards water or moisture?
Hydrotropism
Which type of tropism is responsible for roots growing away from a rock when they come into contact with it?
Thigmotropism
What type of movement is observed in Mimosa pudica when its leaflets droop down when touched?
Nastic Movement
Which of the following is an example of positive thigmotropism?
Ivy growing on a wall
What is the name of the type of tropism where an organism shows movement response to temperature changes?
Thermotropism
What type of tropism is responsible for plant roots growing downward towards gravity?
Gravitropism
Which of the following is an example of negative tropism?
Roots growing away from a rock
Which type of tropism is responsible for an organism's response to an electric field?
Electrotropism
What is the name of the type of tropism where an organism shows a response to sunlight?
Heliotropism
What is the term for the growth or movement of an organism in response to a touch stimulus?
Thigmotropism
What is the role of statoliths in plant cells?
Detecting gravity
Which type of movement is characterized by growth or movement perpendicular to the direction of the stimulus?
Diatropic
What is the term for the growth or movement of an organism in response to water or moisture?
Hydrotropism
Which type of tropism is responsible for the growth of roots towards higher relative humidity levels?
Hydrotropism
What is the direction of growth in negative thigmotropism?
Away from the stimulus
Which type of cell has been reported to show electrotropism?
All of the above
What is the term for the movement response of an organism to an electric field?
Electrotropism
Which type of tropism is responsible for the growth of roots downward towards gravity?
Gravitropism
What is the term for the growth or movement of an organism in response to temperature changes?
Thermotropism
Which type of tropism is responsible for an organism's response to sunlight?
Heliotropism
Study Notes
The Meaning of Tropism
- Tropism is the ability of an organism to respond to a stimulus by turning from one direction to another.
- It is attained by active movement or through a change in the structure of the organism.
- Tropism refers to the growth response of an organism to a stimulus, rather than the movement of the organism.
- It can be positive (toward the stimulus) or negative (away from the stimulus).
Organ and Tissue Tropism
- Organ or tissue tropism shows the ability of a pathogen to invade a specific organ or a group of organs.
- Some pathogens are broadly tropic, infecting many organs, while others are restricted to a specific tissue.
- The capability of a pathogen to infect specific organs might differ over a disease course and could be active.
Pathogen-Mediated Infection
- The ability of a pathogen to infect also requires a previous skin break or a vector bite.
- Microorganisms may be pathogenic or non-pathogenic.
- The severity of the disease is influenced by factors associated with the pathogen and host.
Interactions with Organ and Tissue Niches
- It is important to study the interaction of the pathogen with organ and tissue niches.
- Variations in tropism can be seen in different pathogens, such as Staphylococcus aureus, Trypanosoma brucei, and influenza viruses.
Types of Tropism in Plants
- There are many forms of tropism in plants, including:
- Phototropism: growth or movement toward light
- Geotropism: growth or movement in response to gravity
- Chemotropism: growth or movement in response to chemicals
- Hydrotropism: growth or movement in response to water or moisture
- Thigmotropism: growth or movement in response to touch
- Heliotropism: growth or movement in response to sunlight
- Thermotropism: growth or movement in response to temperature changes
- Electrotropism: growth or movement in response to an electric field
Auxin and Directional Growth
- Auxin plays a major role in growth-mediated plant movements.
- Auxin can either promote or inhibit cell elongation.
- Auxin is produced at the apical region of the shoot and gets carried to other plant parts through auxin carrier proteins.
Plant Cell Growth and Turgor Pressure
- Plant cells exhibit slow, growth-mediated tropic movements.
- All movements of the plants are regulated by the interactions between intracellular turgor pressure and the plant cell wall.
- Fast movements in carnivorous plants are driven by quick changes in water transport supported by mechanical instabilities in the structure of the plants.
The Meaning of Tropism
- Tropism is the ability of an organism to respond to a stimulus by turning from one direction to another.
- It is attained by active movement or through a change in the structure of the organism.
- Tropism refers to the growth response of an organism to a stimulus, rather than the movement of the organism.
- It can be positive (toward the stimulus) or negative (away from the stimulus).
Organ and Tissue Tropism
- Organ or tissue tropism shows the ability of a pathogen to invade a specific organ or a group of organs.
- Some pathogens are broadly tropic, infecting many organs, while others are restricted to a specific tissue.
- The capability of a pathogen to infect specific organs might differ over a disease course and could be active.
Pathogen-Mediated Infection
- The ability of a pathogen to infect also requires a previous skin break or a vector bite.
- Microorganisms may be pathogenic or non-pathogenic.
- The severity of the disease is influenced by factors associated with the pathogen and host.
Interactions with Organ and Tissue Niches
- It is important to study the interaction of the pathogen with organ and tissue niches.
- Variations in tropism can be seen in different pathogens, such as Staphylococcus aureus, Trypanosoma brucei, and influenza viruses.
Types of Tropism in Plants
- There are many forms of tropism in plants, including:
- Phototropism: growth or movement toward light
- Geotropism: growth or movement in response to gravity
- Chemotropism: growth or movement in response to chemicals
- Hydrotropism: growth or movement in response to water or moisture
- Thigmotropism: growth or movement in response to touch
- Heliotropism: growth or movement in response to sunlight
- Thermotropism: growth or movement in response to temperature changes
- Electrotropism: growth or movement in response to an electric field
Auxin and Directional Growth
- Auxin plays a major role in growth-mediated plant movements.
- Auxin can either promote or inhibit cell elongation.
- Auxin is produced at the apical region of the shoot and gets carried to other plant parts through auxin carrier proteins.
Plant Cell Growth and Turgor Pressure
- Plant cells exhibit slow, growth-mediated tropic movements.
- All movements of the plants are regulated by the interactions between intracellular turgor pressure and the plant cell wall.
- Fast movements in carnivorous plants are driven by quick changes in water transport supported by mechanical instabilities in the structure of the plants.
Learn about the concept of tropism, its origin, and how it relates to the ability of pathogens to infect specific locations or organs in the body.
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