Among bryophytes, only the sporophytes of mosses and hornworts have stomata, whe

Question

Among bryophytes, only the sporophytes of mosses and hornworts have stomata, whereas stomata are missing from liverwort sporophytes. If the common ancestor of all bryophytes had sporophytes that bore stomata, then which of these might account for their absence from liverwort sporophytes? If, in contrast to early mosses and hornworts, early liverwort sporophytes had A) decreased need to broadcast spores long distances. B) increased robustness (i.e., thicker, more massive tissues). C) increased nutritional independence from the gametophyte. D) more-effective transport of glucose from gametophyte to sporophyte.

Explanation / Answer

D) more-effective transport of glucose from gametophyte to sporophyte.

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