Question

3. Sieve tube cells of phloem tissue do not possess nuclei in mature state, still they remain alive. Give reason.​

Answer 1

Answer:

In the Initial stage nucleus is present. It disintegrates during maturation of the sieve tube cell and it is the only living cell which can function without nucleus

Answer 2

Reason:

    In the inital stage nucleus is present. It disintegrates during maturation of the sieve tube cell and it is only living cell which can function without nucleus.

Sieve tube cells:

•  Sieve elements are specialized cells that are imporatnt function of phloem, which is a highly organised tissue that transports organic compounds made during photosynthesis.
• Sieve elements are the major conducting cells in phloem.Sieve cells assoicated albuminous cells work bewteen phloem and parenchyma.
• They are connected parenchyma with mature sieve cells to help participate in transport of cells. Depending on the function of the tissue or organ.
• Some pores are very common in the areas that are overlapping sieve cells. Callose level are measured in order to observe the activity of sieve cells.
• Callose acts as block to the sieve pores that are present in both of these sieve elements.
• A lack callose suggested that  the sieve element are more active and therefore can regulate their pores more actively in response to environmental changes.