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A character present in coralloid roots a...

A character present in coralloid roots and absent in dicot roots is
(a) Algal zone
(b) Xylem
(c) Cortex
(d) Pith

A

Algal zone

B

Xylem

C

Cortex

D

Pith.

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, "A character present in coralloid roots and absent in dicot roots is," we need to analyze the options provided and understand the characteristics of coralloid roots. ### Step-by-Step Solution: 1. **Understanding Coralloid Roots**: - Coralloid roots are specialized roots found in Cycas, a type of gymnosperm. - These roots are associated with nitrogen-fixing cyanobacteria, which play a crucial role in nitrogen fixation for the plant. 2. **Identifying the Options**: - (a) Algal zone - (b) Xylem - (c) Cortex - (d) Pith 3. **Analyzing Each Option**: - **Option (a) Algal zone**: This zone is where the cyanobacteria reside within the coralloid roots. Since dicot roots do not have this association with cyanobacteria, the algal zone is absent in dicot roots. - **Option (b) Xylem**: Xylem is present in both coralloid roots and dicot roots, so this option is not correct. - **Option (c) Cortex**: The cortex is also present in both types of roots, making this option incorrect. - **Option (d) Pith**: Pith is typically present in dicot roots and is not a distinguishing feature of coralloid roots, so this option is also incorrect. 4. **Conclusion**: - The only character that is present in coralloid roots and absent in dicot roots is the **algal zone**. Therefore, the correct answer is **(a) Algal zone**. ### Final Answer: (a) Algal zone
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