What are sieve elements? Explain their types & functions.
These are the parts of phloem. They are helpful in the conduction and translocation of food material. Sieve elements are of two types:- (a) Sieve cells:- These are found in pteridophytes and gymnosperms. They have perforated cell walls. (b) Sieve tubes:- These are found in angiosperms. A number of sieve cells are connected to each other giving rise to a channel.
