Resistance to Drought in Desert Plants

Of the following mechanisms in desert plants which would be the least effective in resisting drought:

Dying back of root hairs during a dry season

Expansion of total leaf surface area

Ability to store large amounts of water

Shedding leaves during the dry season

Thick walled seeds

An explanation follows.

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... conserve energy, as it would have less cells to supply with nutrients and seeing as there will be very little water to get anyway, this could be beneficial and it could force its roots to tunnel down deep, where water may be found.
- Expansion of total leaf surface area would be a ...