Question

What is callose?

Answer 1

Sieve tubes:

1. They are the conducting elements of the complex tissue phloem.
2. They have thick primary walls and are also called sieve plates.
3. In mature sieve tubes, a lining layer of cytoplasm is present, but the nucleus is absent.

Callose:

1. It is a substance that blocks the pores present in the sieve plate.
2. It is generally seen in the mature sieve tubes.