Callus is

A

Material that heals injury in phloem

B

Undifferentiated mass of cells

C

Tissue developed in the region of wound

D

All the above

Text Solution

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The correct Answer is:
**Step-by-Step Text Solution:** 1. **Definition of Callus**: Callus is defined as a mass of undifferentiated cells. These cells are not specialized and have the ability to divide continuously. 2. **Formation of Callus**: Callus formation occurs when a few cells undergo repeated divisions. This process can be observed in various biological contexts, especially in plant tissue culture. 3. **Role in Tissue Culture**: In the context of tissue culture, callus is significant because it can be induced to develop into multiple plantlets. This is a method used to propagate plants rapidly. 4. **Types of Callus Culture**: Callus can be grown in two environments: - **In Vitro**: This refers to growing callus in a controlled laboratory environment, such as in petri dishes or culture flasks. - **In Vivo**: This refers to the natural growth of callus in a plant after injury or damage. 5. **Additional Functions**: Besides tissue culture, callus also plays a role in healing injuries in plants, particularly in the phloem, and can develop in response to wounds. 6. **Conclusion**: The correct answer to the question "Callus is" would be option 4, which encompasses its definition and functions. ---
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