How do gymnosperms differ from Angiosperms?

Hint: The vascular plants are classified into two groups, gymnosperms and angiosperms, on the basis of development of seeds. In addition to seed character, there are a number of other distinguishing characters.

Complete answer:

Gymnosperms and Angiosperms are the two types of vascular seed producing plants.
Gymnosperms are the primitive plants, which consists of plants that produce naked seeds, that is the seeds are not protected by any covering or fruit. They are also known as naked seeds as the seeds are exposed. The seeds are usually formed in unisexual cones which are known as strobili. The seeds are developed on the surface of specialized leaves and they bear cones. The plants usually lack fruits and flowers. Gymnosperms are largely woody trees and shrubs. The gymnosperms seeds develop either on the scale or cones. The seeds are developed from the surface of the scales or leaves and are often modified to form cones.
Angiosperms are the largest and most diverse and are referred to as the flowering plants. The angiosperm plants develop seeds from the ovaries of flowers and are surrounded by a protective fruit. The flowers in angiosperms are unisexual or bisexual. The flower is the reproductive organ of the plant and after fertilization, matures into fruits. The seeds are formed and are enclosed within the fruits. In angiosperms, the cells and tissues are more evolved and specialized to perform different functions within the plants.
The above features can be studied and explain differences between the gymnosperms and angiosperms.

Additional information
The gymnosperms and angiosperms together are known as the spermatophytes or the seed bearing plants. Gymnosperms are the unenclosed or exposed seed bearing plants and the angiosperms are the plants bearing coated seeds, flowers and fruits.

Note: Gymnosperms are the group of plants that bear seeds with no external covering or coat, no fruits or flowers and are referred to as naked seeds. Angiosperms are a diverse group of plants, known as flowering plants, that produce seeds that are enclosed in a covering or the ovary.