Question

Mangrove pneumatophore roots _______.
a.
prop the trees up above the water line
b.
excrete excess salt
c.
absorb carbon dioxide from the air
d.
none of the above

Answer 1

d.

Pneumatophores are specialized aerial roots (e.g., in Avicennia) that provide gas exchange (oxygen) for submerged roots via lenticels. Prop roots support the tree above water, and salt is handled by root filtration or salt-excreting glands on leaves.