In which of the following groups would you place a plant that produces spores, lacks seeds and has vascular tissue?

The correct option is Pteridophyte.

To understand why this is the correct classification, we can break down the characteristics of the plant described in the question:
1. Produces Spores: Plants that reproduce via spores rather than seeds are generally cryptogams. This includes algae, bryophytes, and pteridophytes.
2. Lacks Seeds: This ruled out gymnosperms and angiosperms, as both of these groups produce seeds (gymnosperms produce naked seeds, while angiosperms produce seeds enclosed within fruits).
3. Has Vascular Tissue: Vascular tissue consists of xylem and phloem, which are responsible for transporting water, minerals, and nutrients throughout the plant.
Among the seedless, spore-producing plants:
- Algae are simple, thalloid organisms that completely lack vascular tissue.
- Bryophytes (such as mosses and liverworts) are non-vascular land plants. They do not possess true xylem or phloem.
- Pteridophytes (such as ferns and horsetails) are the first terrestrial plants to possess vascular tissues (xylem and phloem) while still reproducing via spores and lacking seeds. They are often referred to as vascular cryptogams.

Therefore, a plant that produces spores, lacks seeds, and has vascular tissue is classified under the group Pteridophyte.