What Is the Structural and Functional Difference Between Stem Tendril and Leaf Tendril
Have you ever seen a slender, thread-like structure on a pea or grape plant? Do you know what those structures are and what is their function? How were these structures formed?
These are known as tendrils and they are the modification of stems and leaves. To know more about tendrils continue reading.
What are Tendrils?
Tendrils are common modifications of plant parts such as leaf, stem, and petiole.
A tendril is a slender,thread-like structure that is specialized to provide support and anchor. Tendrils are commonly green in color and perform the function of photosynthesis. Tendrils do not grow vertically, they grow around a particular support, surrounding that support, and increase in height.
Stem Tendril
Modification of branches or any stem parts makes the stem tendrils. Stem tendrils are commonly found in bitter gourd, grapevine, and bottle gourd. On stems or branches, buds are present which may be terminal or axillary. Stem tendrils are derived from axillary buds. Scale leaves may be present on the stem tendrils and stem tendrils may be branched or unbranched.
Types of Stem Tendrils and Their Examples
There are various types of stem tendrils based on their origin. Some of the types are given below-
Axillary - These stem tendrils are derived from the axillary bud. Eg. Passiflora
Apical- These stem tendrils are derived from the apical bud. Eg grapevine
Extra Axillary Stem Tendril - These stem tendrils are derived from the other parts of the stem or nodes of the leaf base. Eg. Luffa
Floral Bud - These stem tendrils are derived from the floral buds. Eg. Antigonon.
Leaf Tendril
Leaf tendrils are the modifications of the leaf. It is a special plant organ that requires support to grow and encircle the support for further growth. Leaf tendrils help the plant to grow and also establish the plant during high winds.
The leaf axis terminates into leaf tendrils in some plants such as vicia and sweet peas.
Types of Leaf Tendrils and Their Examples
There are various types of leaf tendrils based on which part they develop.
Whole Leaf Tendrils - In this type of tendril, the whole leaf is developed into a tendril. Eg. Lathyrus aphasia
Stipular Tendrils - These tendrils derive from adnate stipules. Eg. Smilax.
Leaflet Tendrils - In this upper leaflet is converted into a tendril. Eg. Sweet pea and edible pea.
The Similarity Between Leaf Tendrils and Stem Tendrils
There are many differences as well as similarities between leaf tendrils and stem tendrils. Some of the similarities between leaf tendrils and stem tendrils are discussed below:
Both leaf and stem tendrils are sensitive to touch, they get coiled on touch
Both leaf tendrils and stem tendrils provide support and attachment to growing parts
Both leaf and stem tendrils emerge as modifications of important and major plant parts such as stem and leaf
Leaf and stem tendrils both see green in color and contain chlorophyll and perform photosynthesis.
Differences Between Stem Tendrils and Leaf Tendrils
Facts About Tendrils
Tendrils of some plants are of high nutritive value
Pea tendrils are a very good source of vitamin C, fibers, and folate
Tendrils can climb very high
Grapevines can climb up to 80 feet.
Key Features
Tendrils are the common modification of stem and leaves
They provide support to the growing plants
The main difference between stem tendrils and leaf tendrils is that Stem tendrils are derived from a particular part of a stem whereas leaf tendrils are derived from a whole leaf or a particular part of a leaf.
Some stem tendrils develop from the axillary bud, and some develop from the apical bud
In leaf tendrils, some develop from the whole leaf and some develop from a particular part of a leaf.
Practice Questions
1. Are tendrils stem or leaf?
2. What are the types of tendrils?
3. Is cucumber stem tendril?
4. What is the difference between stem and leaf?
5. What are tendrils? Give examples of tendrils.
FAQs on Difference Between Stem Tendril and Leaf Tendril in Plants
1. What is the difference between stem tendril and leaf tendril?
The main difference between a stem tendril and a leaf tendril is that a stem tendril develops from the stem or axillary bud, while a leaf tendril develops from a modified leaf or its parts.
- Stem tendril: Arises from the stem, often from the axil of a leaf (e.g., Vitis – grapevine).
- Leaf tendril: Forms from the whole leaf or part of it such as leaflet, petiole, or stipule (e.g., Pisum sativum – pea).
- Both are modifications that help climbing plants attach to support.
2. What is a stem tendril?
A stem tendril is a slender, coiling structure that develops from the stem or axillary bud to help a plant climb.
- It is a modification of the stem.
- Common in climbing plants like grapevine (Vitis) and Passiflora.
- It coils around nearby objects for mechanical support.
3. What is a leaf tendril?
A leaf tendril is a modified leaf or part of a leaf that becomes thin and coiled to aid in climbing.
- May develop from the entire leaf, leaflets, petiole, or stipules.
- Seen in plants like pea (Pisum sativum) and Lathyrus.
- It helps weak-stemmed plants attach to support structures.
4. How can you identify a stem tendril and a leaf tendril?
Stem tendrils can be identified by their origin from the stem, while leaf tendrils arise from modified leaves or leaf parts.
- Stem tendril: Located opposite a leaf or from the axillary bud.
- Leaf tendril: Found in place of a leaflet or at the tip of a compound leaf.
- Careful observation of the point of origin helps in identification.
5. What is the function of stem tendril and leaf tendril?
Both stem tendrils and leaf tendrils function to provide support and help climbing plants grow upward.
- They coil around nearby structures.
- Provide mechanical support to weak stems.
- Help plants access better sunlight for photosynthesis.
6. Can you give examples of stem tendril and leaf tendril?
Common examples of stem tendrils include grapevine, while pea plants show leaf tendrils.
- Stem tendril: Vitis (grapevine), Passiflora.
- Leaf tendril: Pisum sativum (pea), Lathyrus.
- These examples clearly show different origins of tendril modification.
7. Are stem tendrils and leaf tendrils homologous structures?
Stem tendrils and leaf tendrils are not homologous because they originate from different plant organs.
- Stem tendril: Modified stem.
- Leaf tendril: Modified leaf or leaf part.
- They are examples of analogous structures since they perform the same function but have different origins.
8. Why do climbing plants develop tendrils?
Climbing plants develop tendrils to obtain support and grow vertically without investing in thick stems.
- Tendrils help anchor the plant to nearby objects.
- Allow efficient use of energy for growth.
- Improve exposure to sunlight for better photosynthesis.
9. How are leaf tendrils formed in pea plants?
In pea plants, leaf tendrils are formed by the modification of the terminal leaflets of a compound leaf.
- The upper leaflets transform into slender, coiling structures.
- The lower leaflets remain normal and perform photosynthesis.
- This modification helps the plant climb nearby support.
10. What are the types of leaf tendrils?
Leaf tendrils can be classified based on which part of the leaf is modified into a tendril.
- Whole leaf tendril – entire leaf becomes a tendril (e.g., Lathyrus aphaca).
- Leaflet tendril – leaflets become tendrils (e.g., pea).
- Petiole tendril – petiole coils around support (e.g., Clematis).
- Stipular tendril – stipules form tendrils (e.g., Smilax).
