What is the major evolutionary trend in land plant life...

What is the major evolutionary trend in land plant life cycles? a. Instead of heing approximately the same size and shape, gametophytes and sporophytes began to look different. b. Sporophytes became larger and long lived while gametophytes became drastically reduced. c. In lineages that evolved more recently, such as angiosperms, spores are no longer produced. d. Sporophytes began to rely on gametophytes for all of their nutritional needs.

What is the major evolutionary trend in land plant life cycles?
a. Instead of heing approximately the same size and shape, gametophytes and sporophytes began to look different.
b. Sporophytes became larger and long lived while gametophytes became drastically reduced.
c. In lineages that evolved more recently, such as angiosperms, spores are no longer produced.
d. Sporophytes began to rely on gametophytes for all of their nutritional needs.

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Key Concepts

Alternation of Generations

This concept refers to the distinct life cycle seen in plants where two separate phases, a haploid gametophyte and a diploid sporophyte, exist. Each phase performs unique roles in the reproductive cycle, with the gametophyte generating gametes and the sporophyte producing spores, allowing for both sexual and asexual reproduction in plant evolution.

Gametophyte Reduction

Over evolutionary time, particularly in land plants, the gametophyte stage has gradually become more reduced in size, complexity, and independence. This reduction is a key evolutionary trend, enabling the shift towards increased reliance on the sporophyte stage for growth, support, and resource acquisition.

Sporophyte Dominance

In contrast with the reduction of the gametophyte stage, the sporophyte has expanded to become the dominant phase in the plant life cycle. This stage is typically larger, long-lived, and more complex, playing a central role in the plant's development, nutrient acquisition, and overall success in terrestrial environments.

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