Pollen grain of Capsella is tricoplate.

Explanation:
Capsella bursa-pastoris, commonly known as shepherd's purse, is a flowering plant that belongs to the mustard family (Brassicaceae). Like other members of this family, the pollen grain of Capsella is tricoplate. Here's what that means:

Pollen Grain: Pollen grains are tiny structures that contain the male reproductive cells of flowering plants. These grains are produced in the anthers of the flower and are dispersed by wind, water, or animals to reach the female reproductive organs of other flowers of the same species.

Tricoplate: Tricoplate pollen grains are characterized by having three germinal pores or furrows on their surface. These furrows are formed during the development of the pollen grain and serve as exit points for the male reproductive cells during pollination. The tricoplate pollen grains are further classified into three types based on the position of the furrows:

- Triporate: The furrows are located at the poles of the pollen grain.
- Tricolpate: The furrows are located along the equator of the pollen grain.
- Tricolporate: The furrows are located at both the poles and equator of the pollen grain.

In Capsella, the tricoplate pollen grains are triporate, which means the furrows are located at the poles of the pollen grain. This type of pollen morphology is common in members of the Brassicaceae family, which includes other important crops such as broccoli, cauliflower, and mustard.

In summary, the pollen grain of Capsella is tricoplate, which means it has three germinal furrows or pores on its surface, located at the poles of the grain. This type of pollen morphology is common in the Brassicaceae family.