Photosynthesis – Solutions

1. By looking at a plant externally, can you tell whether a plant is C₃

or C₄? Why and how?

Solution:

It is not possible to identify C₃ or C₄ plant on the basis of morphological observations. Leaf anatomy is one criterion for distinguishing C₃ and C₄ plants, as C₄ plants are characterised by the presence of ‘kranz anatomy’.

2. By looking at which internal structure of a plant can you tell

whether a plant is C₃ or C₄? Explain.

Solution:

C₃ and C₄ plants can be distinguished on the basis of leaf anatomy. C₄ plants have ‘kranz anatomy’, which is characterised by the presence of  dimorphic chloroplasts.