In endosperm of maize and Cycas, the ploidy level is:

Options

A. Triploid in both
B. Triploid and haploid
C. Triploid and diploid
D. Diploid and triploid.

Answer

To determine the ploidy level of the endosperm in maize and Cycas, we need to analyze the reproductive processes of both plants.

### Step-by-Step Solution:

1. **Identify the Plant Types**:
- Maize (Zea mays) is an angiosperm.
- Cycas is a gymnosperm.

2. **Understand Endosperm Formation in Angiosperms (Maize)**:
- Angiosperms undergo a process called double fertilization.
- In this process, one male gamete fuses with the egg cell to form a diploid zygote (syngamy).
- The other male gamete fuses with two polar nuclei in the embryo sac, leading to the formation of the triploid endosperm (triple fusion).

3. **Determine the Ploidy Level in Maize**:
- The endosperm in maize is triploid (3n) due to the fusion of one male gamete with two polar nuclei.

4. **Understand Endosperm Formation in Gymnosperms (Cycas)**:
- Gymnosperms do not undergo double fertilization.
- Instead, the endosperm is formed from a haploid megaspore that undergoes mitotic divisions.
- This results in a haploid endosperm.

5. **Determine the Ploidy Level in Cycas**:
- The endosperm in Cycas is haploid (n).

6. **Final Conclusion**:
- Therefore, the ploidy levels of the endosperm in maize and Cycas are triploid (3n) and haploid (n), respectively.

### Final Answer:
The ploidy level in the endosperm of maize and Cycas is triploid and haploid.

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