Which statement is not correct about Cycas ?

Options

A. Cycas has small specialised roots called coralloid roots which are associated with N2- fixing cyanobacteria.
B. It is a heterosporous plant
C. The male cones & female cones are borne on same tree.
D. Male & Female gametophytes are not free living.

Answer

### Step-by-Step Solution:

1. **Identify the Organism**: The question asks about Cycas, which is a genus of plants belonging to the phylum Gymnosperms.

2. **Review the Statements**: We need to evaluate the given statements about Cycas to determine which one is incorrect.

3. **Evaluate the First Statement**:
- **Statement**: "Cycas has small specialized roots called coralloid roots which are associated with N2-fixing Cyanobacteria."
- **Evaluation**: This statement is correct. Coralloid roots in Cycas do associate with Cyanobacteria for nitrogen fixation.

4. **Evaluate the Second Statement**:
- **Statement**: "It is a heterosporous plant."
- **Evaluation**: This statement is also correct. Cycas produces two types of spores: microspores (male) and megaspores (female).

5. **Evaluate the Third Statement**:
- **Statement**: "Male cones and female cones are born on the same tree."
- **Evaluation**: This statement is incorrect. Cycas is dioecious, meaning male and female cones are produced on separate plants.

6. **Evaluate the Fourth Statement**:
- **Statement**: "The male and female gametophytes are not free-living."
- **Evaluation**: This statement is correct. In Cycas, the gametophytes are dependent on the sporophyte for nutrition.

7. **Conclusion**: The statement that is not correct about Cycas is the third one: "Male cones and female cones are born on the same tree."

### Final Answer:
The statement that is not correct about Cycas is: "Male cones and female cones are born on the same tree."

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