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

To determine which statement is not correct about Cycas, we will analyze each statement provided in the question.

### Step-by-Step Solution:

1. **Understanding Cycas**: Cycas is a genus of gymnosperms, which are seed-producing plants that do not form flowers or fruits. They produce naked seeds and are classified under the group of cycads.

2. **Analyzing Statement A**: "Cycas has small specialized roots called coralloid roots which are associated with nitrogen-fixing cyanobacteria."
- **Explanation**: This statement is correct. Cycas does have coralloid roots that form a symbiotic relationship with nitrogen-fixing cyanobacteria, helping the plant to obtain nitrogen.

3. **Analyzing Statement B**: "It is a heterosporous plant."
- **Explanation**: This statement is also correct. Cycas is heterosporous, meaning it produces two different types of spores: megaspores (which develop into female gametophytes) and microspores (which develop into male gametophytes).

4. **Analyzing Statement C**: "The male cones and female cones are born on the same tree."
- **Explanation**: This statement is incorrect. Cycas is dioecious, meaning that male and female cones are produced on separate plants. Therefore, male and female reproductive structures do not occur on the same individual.

5. **Analyzing Statement D**: "Male and female gametophytes are not free-living."
- **Explanation**: This statement is correct. In Cycas, both male and female gametophytes are dependent on the sporophyte for nutrition and are not free-living.

### Conclusion:
The statement that is not correct about Cycas is **Statement C**: "The male cones and female cones are born on the same tree."

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