QuestenaPractice that shows what to review next
SearchCreate a test
Question 43

Leaves are thin as well as broad. What does being thin do for a leaf?

  1. It lets the light shine right through the leaf to the ground below
  2. It stops the leaf from getting too heavy for its stalk
  3. It keeps the distance short for gases diffusing in and outCorrect answer
  4. It lets the leaf bend in the wind without tearing

Explanation

Diffusion is slow over long distances, so keeping every cell close to a surface means the gases a leaf exchanges never have far to travel. The look-alike answer about light passing through describes the clear covering of a leaf rather than its thinness, and light that passes straight through has not been used at all.

Continue with this test

Start practice
Understand this topic (≈5 min)Back to test
Question 43: Leaves are thin as well as broad. What does being thin do… · Plants and Photosynthesis · Questena