Question

Why does sieve cells have minute pores in them?
in own words

Answer 1

Answer:

Sieve-tube members are tubular in structure. These are continuously placed and have specialised sieve areas called as sieve plates which occur at the end. Sieve areas have several perforations through which the adjacent sieve cells are interconnected by protoplasmic strands. They are blocked by callose at maturity. Accumulation of callose occurs in an old, non-functional sieve elements and seals the old elements closed to keep the phloem translocation stream active.

Answer 2

Answer:

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Explanation:

Sieve pores of the sieve plates connect neighboring sieve elements to form the conducting sieve tubes of the phloem. Sieve pores are critical for phloem function. From the 1950s onwards, when electron microscopes became increasingly available, the study of their formation had been a pillar of phloem research.