Primary tropical rainforest has a canopy 10 metres above the forest floor. The forest
floor lacks dense vegetation. The vegetation found on the forest floor consists of
huge tree trunks with a few hanging vines and bushes. The vegetation also consists
of a variety of seedlings and a variety of small ground plants.
Which of the following reasons for the sparse vegetation on the floor of a tropical
forest is incorrect?
a) The nutrients present in the soil are inadequate for the growth of thick
vegetation.
b) The canopy blocks out the sunlight so that very little reaches the forest floor.
c) A proper amount of oxygen cannot reach the plants on the forest floor to ensure
their growth.
d) The canopy prevents most rainwater from reaching the ground.