An anther consists of two theca, which are the pollen sacs responsible for producing and storing pollen grains. Each theca is located at the tip of a structure called a filament, which is part of the stamen of a flower.

Anther Structure:
- The anther is the male reproductive organ of a flower, consisting of two theca that are connected by a tissue called the connective.
- Each theca is a chamber that contains pollen grains, which are the male gametes of the plant.
- The theca is lined with cells that undergo meiosis to produce haploid pollen grains.
- The connective tissue provides support and helps in the dehiscence of the anther to release pollen.

Pollen Production:
- The anther develops from a primordium, which differentiates into the theca and filament.
- As the anther matures, the pollen grains undergo development within the theca.
- Pollen grains contain the male gametes that are essential for fertilizing the female gametes in the ovary of the flower.
- The theca protects and nourishes the pollen grains until they are released during pollination.

Significance of Anther:
- The anther plays a crucial role in the reproduction of plants by producing and dispersing pollen.
- Pollen grains contain the genetic information necessary for fertilization, allowing for the formation of seeds and the continuation of plant species.
- The anther's structure and function are essential for the successful reproduction and propagation of flowering plants.
In conclusion, an anther consists of two theca, which are the pollen sacs responsible for producing and storing pollen grains. The structure and function of the anther are vital for the reproductive success of flowering plants.