Question

At maturity sieve plates become impregnated with
A. Cellulose
B. Suberin
C. Callose
D. Lignin
E. Pectin

Answer 1

Sieve components are specific cells that work in the conduction of sugars. They are regularly connected with parenchyma and frequently some sclerenchyma in a typical tissue known as phloem. Sieve components are stretch cells having just an essential divider with no lignified 2 ° cell divider. This essential divider has particular pores, which are collected together into sifter zones.

Complete answer:
Sieve tube members are rounded in structure. These are persistently positioned and have particular sieve territories called sieve plates which happen toward the end. Sieve locations have a few holes through which the neighboring sifter cells are interconnected by protoplasmic strands. They are impregnated by callose at development.
Sieve plates are shaped by two connecting end dividers of neighboring sieve components of sieve containers of phloem. At development, these become impregnated with callose cushion, which might be occasional callose (for just restricted horrible period) or authoritative callose (framed forever in workless old sifter tubes).
Dust tube dividers of flowering plants contain callose that lives in the cylinder divider and structures the fittings that different the developing tip from the emptied tail. The callose plug keeps the dust cytosol inside a sensibly little volume and accordingly has been thought to assume a significant function for treatment.

Hence, the correct answer is option (C).

Additional information:
Cellulose is a long-chain polymer of glucose particles consolidated. As the plant adds one glucose atom to the polymer, one particle of water is delivered. Cellulose polymerization happens as a plant develops and makes new cells.
Suberized cells structure the periderm, the tissue that encompasses auxiliary stems as a feature of the bark and creates the fixing tissue in the wake of injuring or leaf abscission.
Lignin emerges essentially from the expansion of monolignols to the ceaselessly developing polymer and not from the coupling of monolignols to create dimers, as hypothesized by the dirigent protein model.
Pectin is a gathering of substances which structures gels when disintegrated in water under reasonable conditions. It is obtained from the protopectin found in the center lamellae of plant cells.

Note: Callose is a cell divider material that can be saved around sieve pores. The deposition prompts in the diminishing of pore measurement and the long run to complete impediment. Callose arrangement has appeared to happen inside minutes after injury and prompts tube impediment inside 10-20 minutes in certain species. Callose assumes significant parts during an assortment of cycles in plant improvement or potentially because of numerous biotic and abiotic stresses.