Female gametophyte in Gnetum at later stage is :

The correct answer is Mutinucleate

Explanation:

• The female gametophyte in Gnetum at a later stage is multinucleate. This means that it contains multiple nuclei, which is a characteristic feature of the development stage of the gametophyte in Gnetum and other gymnosperms.
• The development of the female gametophyte involves a series of divisions that increase the number of nuclei within the cell, leading to a multinucleate condition.
• This is crucial for the formation of multiple archegonia, which are the female reproductive structures in these plants.

Other Options:

• Uninucleate: At the initial stages of development, the female gametophyte may start as uninucleate, but it does not remain so at later stages. It undergoes further divisions to increase the number of nuclei, hence, being uninucleate is an early characteristic.
• Binucleate: Similar to the uninucleate stage, a binucleate condition might be an intermediate phase in the development of the female gametophyte. However, it progresses beyond this stage to become multinucleate as it matures.
• Eight nucleate: While an eight-nucleate stage might be significant in the development of female gametophytes in angiosperms (for example, in the formation of the embryo sac), in Gnetum, the female gametophyte surpasses this stage to become multinucleate, making this option incorrect for the specified stage of Gnetum.