[Campbell Biology P.688] The 'WHAT IF?' question asks: 'If a seed could not enter dormancy, ... | Practice Question

The 'WHAT IF?' question asks: 'If a seed could not enter dormancy, how might that affect the embryo's transport or survival?' Based on the context of the entire Scientific Skills Exercise and 'The Evolutionary Advantage of Seeds' section, what would be the most significant consequence?

  • A: The seed would immediately begin photosynthesis, depleting its stored food reserves too quickly.
  • B: The embryo would be highly vulnerable to environmental extremes during transport and unable to wait for favorable germination conditions, severely limiting its chances of survival and establishment.
  • C: The seed coat would lose its protective function, making the embryo susceptible to pathogens.
  • D: It would reduce the seed's ability to be carried by wind or animals, as a non-dormant seed would be heavier.

Explanation

The passage states that dormancy is a way plants 'cope with such variation' unfavorable environmental conditions and that seeds 'can remain dormant for days, months, or even years' to 'emerge from dormancy and germinate, with its stored food providing critical support for growth as the sporophyte embryo emerges as a seedling.' If a seed could not enter dormancy, it would be forced to germinate immediately regardless of conditions. This would make it highly susceptible to death during dispersal if conditions are not favorable for growth e.g., too cold, hot, dry, or lacking light/water or before it can reach a suitable habitat. The text emphasizes dormancy for survival under harsh conditions and facilitating dispersal to new habitats.