Tropic Movements In Plants (original) (raw)
Last Updated : 23 Jul, 2025
**Tropic Movements in Plants are also known as Plant Tropisms. It is a unidirectional movement of the plants that happens due to the **response to different stimuli. This movement can occur in the same direction, or it is also possible to take place in the opposite direction of a particular stimulus. Plant movements take place when they need light, water, essential nutrients, etc. to live. In this article, we are going to discuss the **Tropic Movements in Plants, types of tropic movements, processes, examples, and advantages.
Table of Content
- Tropic Movements in Plants
- Tropic Movements Types
- Process of Tropic Movements In Plants
- Tropic Movements in Plants Examples
- Advantages - Tropic Movements In Plants
- Difference Between Tropic Movement And Nastic Movement
Tropic Movements in Plants
**Tropic Movement is a specific process where a plant moves in one direction of the **stimulus. A particular plant can either display a negative movement or a positive movement in response to that specific stimulus. The **positive tropic movement happens when the movement is towards the direction of stimuli. On the other hand, a **negative tropic movement happens when the movement happens in the opposite direction from the stimuli.
**Also Read: Parts Of Plants, Diagram And Functions
Tropic Movements Types
Tropic movements, also known as Tropisms, is a unidirectional movement of plants. It **happens in response to **different environmental stimuli.
Plant Tropisms
There are **six major types of tropic movements in plants as mentioned below:
Phototropism
The phototropism happens under the rection of light. In phototropism, plants grow towards light or grow away to the opposite direction of the light. In general, the plant stems are usually positive for **phototropism. On the other hand, the plant roots show negative phototropism which grows against the light in the soil. The leaves also respond positively toward the light source.
- Phototropism is a tropic movement in plants. In simple words, it is the growth of a plant in response to an external stimulus.
- It involves plants orienting their growth towards or away from a sunlight source.
- The plant hormones, like auxins, help in the growth of the light source.
- Phototropism helps the leaves to grow in the sunlight. It helps to increase their ability to produce energy through photosynthesis.
Gravitropism
Gravitropism is a tropic movement in plants that **responds to gravity by growing towards it. The shoots are gravitropism negative and roots are the gravitropism positive. Gravitropism is also known as the **geotropism. The leaves are generally geotropic as they select their positions at right angles. Leaves stay intact with the steams at the center of gravity.
- Gravitropism is generally involved with the growth or movement of plant parts majorly **roots and stems.
- This type of tropic movement helps the plants to orient themselves properly in the soil.
- This particular tropic movement optimizes the growth of roots and stems. It also ensures that roots penetrate the soil and shoots will grow towards sunlight.
**Also Read: Difference between Shoot and Stem
Chemotropism
Chemotropism is a tropic movement in plants that is majorly caused by specific chemical compounds. This tropic movement results in the curvature movement in different plant organs.
- Chemotropism helps the plants locate the nutrients, water, or other necessary substances to grow and survive.
- During fertilization, this process is really helpful as it helps in the movement of pollen tubes towards ovules.
**Also Read: Fertilization in Plants
Thigmotropism
Thigmotropism is a tropic movement in plants where the plants grow or develop in reaction to contact with a solid object. It is also known as **haptotropism.
- Thigmotropism generally involves in the directional growth of the **roots, stems, or tendrils.
- This tropic movement helps a plant to adapt new environment.
- In this movement, plats generally find support to grow by wrapping or climbing on them.
Thermotropism
Thermotropism is a type of tropic movement where a plant or a plant portion reacts to changes in the ambient temperature.
- Thermotropism is the tropic movement of plants in which they respond to the temperature and heat resources.
- This tropic movement generally depends on the species of a plant and on the conditions where the plant grows.
- Thermotropism helps plants to regulate the functions like photosynthesis, seed germination, and overall growth and development of a plant.
Hydrotropism
Hydrotropic is a tropic movement that helps a plant’s movement or growth in response to water stimulus or water sources. In this tropic movement, roots migrate and grow towards the water. Through this process, plants display a positive response to being hydrotropic.
- Hydrotropism allows the plants to locate and access water resources.
- The water resources generally lead this movement through specialized cells present in a root tip.
- Hydrotropism helps the plants to adapt the soil moisture levels to increase the resilience to the drought conditions.
Process of Tropic Movements In Plants
- **Tropic Movements In Plants are **directional stimuli reactions. It is a **three step process as mentioned below. **Stimulus Sensation: It is the e first step of the tropic movement of a plant. When the living being reacts to the stimuli, it can benefit the plants. **Signal
- **Transduction : Signal transduction is a process where the signal elements of the environment transmit through the plant cell through the signal transduction pathways.
- **Directional Growth: It is the final step of the tropic movements in plants. It is the directional growth response that occurs in response to the touch of an object.
Tropic Movements in Plants Examples
Here we have mentioned some examples of the plants, based on their tropic movements. Let us discuss.
| Example - Tropic Movements In Plants | |
|---|---|
| Tropic Movement | Example Plants |
| Thigmotropism | Passionflowers |
| Ivy | |
| Pea plants | |
| Climbing roses | |
| Grapevines | |
| Phototropism | Sunflowers |
| Corn plants | |
| Morning glory | |
| Geraniums | |
| Marigolds | |
| Geotropism | Bean plants |
| Carrot plants | |
| Pine trees | |
| Dandelions | |
| Bamboo | |
| Thermotropism | Venus flytrap |
| Mimosa pudica | |
| Agave plants | |
| Wheat | |
| Arabidopsis thaliana | |
| Chemotropism | Fungi |
| Bacteria | |
| Orchids | |
| Mosses | |
| Algae | |
| Hydrotropism | Bean plants |
| Wheat | |
| Rice | |
| Mustard plants | |
| Oak trees |
Advantages - Tropic Movements In Plants
Here are the major advantages of Tropic Movements In Plants as mentioned below.
- Tropic movements in plants enable them to capture sunlight for photosynthesis in an efficient manner.
- These particular movements help the plants to navigate the water sources in different environmental conditions.
- It involves plants orienting their growth towards or away from a sunlight source.
- Tropic movement helps the plants to orient themselves properly in the soil.
- Tropic movement optimizes the growth of roots and stems.
- During fertilization, tropic movement is really helpful in the movement of pollen tubes towards ovules.
- The tropic movement helps plants to regulate the functions like photosynthesis, seed germination, and overall growth and development of a plant.
Difference Between Tropic Movement And Nastic Movement
In the table mentioned below, we have discussed the major differences between the tropic movement and nastic movement of a plant.
| Difference Between Tropic Movement And Nastic Movement | ||
|---|---|---|
| Aspect | Tropic Movement | Nastic Movement |
| Definition | Directed growth response towards a particular stimulus. | Non-directional response to stimuli. |
| Direction of Movement | Typically towards or away from the stimulus | Not necessarily towards or away from the stimulus |
| Response Process | Growth or curvature of plant organs in response to external stimuli. | Changes in turgor pressure or cell expansion causing movement. |
| Timing of Response | Generally slower response. | Can be rapid. |
| Control Mechanism | Controlled by hormones and external stimuli. | Influenced by environmental factors such as temperature, light, or touch. |
| Adaptation | Facilitates directional growth and orientation of plants for survival and resource. | Involved in rapid responses to environmental changes for protection or reproductive purposes. |
Conclusion - Tropic Movements In Plants
In conclusion, the tropic movements in plants play a major role in their ability to respond and adapt to any new environment. These tropic movements, also called tropism, includes phototropism, gravitropism, and hydrotropism, allow plants to grow towards light. They help to move the plants towards gravity and look for the water resources to sustain their lives.
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