(A) Callus (often referred to in the context of sieve plates) is composed of $Callose$. $Callose$ is a $\beta-1,3-glucan$ polysaccharide. In plant sie

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(A) Callus (often referred to in the context of sieve plates) is composed of $Callose$. $Callose$ is a $\beta-1,3-glucan$ polysaccharide. In plant sieve tubes,cytoplasmic strands passing through the sieve pores are often encased in a cylinder of $Callose$,which helps in regulating the transport of materials.