Which one of the following is considered important in the development of seed habit ?Free-living gametophyteDependent sporophyteHeterosporyHaplontic life cycle

The development of seed habit is considered to be closely associated with Heterospory.

Here's a step-by-step explanation:

1. Heterospory: This is the production of two distinct types of spores: microspores and megaspores. The microspores develop into male gametophytes and the megaspores develop into female gametophytes. This is a crucial step in the development of seed habit as it leads to the differentiation of male and female reproductive structures, which is a characteristic of seed plants.

2. Free-living gametophyte: This is not considered important in the development of seed habit. In seed plants, the gametophyte is not free-living but is dependent on the sporophyte for nutrition.

3. Dependent sporophyte: This is a characteristic of non-seed plants like mosses and ferns. In seed plants, the sporophyte is the dominant phase and the gametophyte is dependent on it.

4. Haplontic life cycle: This is a type of life cycle where the dominant phase is the haploid phase. This is not characteristic of seed plants. In seed plants, the dominant phase is the diploid sporophyte phase.

So, among the options given, Heterospory is considered important in the development of seed habit.