Pollen Grain of Aquatic Plants Contains Exine

Aquatic plants are plants that grow in water or in habitats that are regularly saturated with water. These plants have specific adaptations to survive in aquatic environments, including adaptations in their reproductive structures such as pollen grains.

What is Exine?
Exine is the outer layer of the pollen grain, which is composed of a tough and resistant material called sporopollenin. It is the most durable organic substance known in nature, providing protection to the pollen grain against various environmental factors such as desiccation, UV radiation, and microbial degradation.

Pollen Grain Structure
A pollen grain is the male reproductive structure of a plant, responsible for the transfer of male gametes to the female reproductive organs. It consists of several layers, including the outermost layer called exine.

Presence of Exine in Aquatic Plant Pollen Grains
Contrary to popular belief, the pollen grains of aquatic plants do contain exine. The exine layer in these pollen grains serves a protective role against environmental factors, just like in terrestrial plants. It helps prevent dehydration and damage caused by UV radiation and other external influences.

Adaptations of Aquatic Plant Pollen Grains
While the presence of exine in aquatic plant pollen grains is similar to that of terrestrial plants, there are certain adaptations specific to aquatic environments. These adaptations allow the pollen grains to disperse in water and reach the female reproductive structures.

1. Reduced Size: Aquatic plant pollen grains are generally smaller in size compared to those of terrestrial plants. This reduction in size aids in their buoyancy and facilitates easier movement in water.

2. Surface Modifications: The exine layer of aquatic plant pollen grains often exhibits modifications such as spines, ridges, or sculpturing. These surface features increase the surface area of the pollen grain, enhancing its ability to float on water and increasing the chances of successful pollination.

3. Hydrophobic Properties: The exine layer of aquatic plant pollen grains has hydrophobic properties, which repel water and help prevent the pollen from becoming waterlogged. This allows the pollen grains to remain buoyant and viable for longer periods, increasing their chances of successful pollination.

Conclusion
In conclusion, the pollen grains of aquatic plants do contain exine. This outer layer provides protection and facilitates the dispersal of pollen grains in aquatic environments. The presence of exine, along with other adaptations, allows aquatic plant pollen grains to successfully reach the female reproductive structures for fertilization.

Pollen grain that are live in aquatic plant they removed the pollen grain because plant contain aquatic behaviour so the exile layer is removed