a. What are the three clear cut phases in the life of annual and biennial type of plants?
b. Why is it difficult to define these phases in perennial species of plants?

What are the three major phases in the cycle of an organism? Define each phase.

In Bryophytes, the dominant phase in the life cycle is the the gametophyte plant. However in pteridophytes the main plant body is a sporophyte. How can we easily differentiate between the the sporophytes in bryophytes and pteridophytes.