exostomes

Example:The presence of exostomes in certain types of pollen grains represents a key evolutionary adaptation to enhance pollen dispersal.

Definition:The trait of exostomes in pollen grains is considered an evolutionary adaptation for better pollen dispersal and survival in harsh environments.

Example:When examining pollen grains under a microscope, the botanist noted the presence of exostomes, which are distinct structures that aid in pollen grain resilience.

Definition:A structure produced by the male reproductive organs of plants containing male gametes (microspores). Exostomes are a specific feature found in the outer layers of some pollen grains.