Explanation:

The correct statement is option 'C', which states that amoeboid tapetum releases Ubisch bodies. Let's understand why this statement is incorrect.

Monothecous anthers in Malvaceae family:
Monothecous anthers are found in the Malvaceae family, which includes plants like hibiscus, cotton, and okra. In monothecous anthers, the anther lobes fuse together to form a single chamber.

Ephemeral middle layer:
The middle layer is one of the layers present in the anther wall. It is located between the tapetum and the endothecium. The middle layer is not ephemeral, meaning it is not short-lived. It serves as a nutritive tissue during pollen development.

Monocarpic nature of banana:
Banana is a monocarpic plant, which means it fruits only once in its lifetime. After the fruiting, the main stem dies, and new suckers (offshoots) grow from the base to produce new plants.

Amoeboid tapetum and Ubisch bodies:
This is where the statement given in option 'C' is incorrect. The tapetum is a specialized layer of cells present in the anther wall. It plays a crucial role in pollen development and nourishment. There are two types of tapetum: amoeboid and secretory.

The amoeboid tapetum is found in plants like Solanaceae, Poaceae, and Orchidaceae. It releases elaioplasts, which are lipid-filled structures involved in the formation of the pollen coat. On the other hand, the secretory tapetum found in most angiosperms releases Ubisch bodies.

Ubisch bodies are organelles consisting of lipids and proteins. They are involved in the formation of the pollen exine, which is the outer layer of the pollen grain. Ubisch bodies migrate from the tapetum to the developing pollen grains and contribute to the deposition of sporopollenin, a major component of the pollen exine.

In conclusion, option 'C' is the incorrect statement because amoeboid tapetum releases elaioplasts, not Ubisch bodies.