MCQ
The chief function of sieve tubes is
- ✓To translocate the organic materials manufactured in the leaves
- BTo conduct minerals
- CTo transport water from root to leaves
- DTo help the plant in forming wood
Usually the perforations in the sieve plates are surrounded by callose. The callose is soluble and disappears when the solute is dilute so that the solute can pass from one cell to another cell through the pores.
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$(i)$ They are named because of their special function of linking and supporting other tissues/organs of the body.
$(ii)$ They include cartilage, bone, adipose and blood.
$(iii)$ They provide strength, elasticity and flexibility to the tissue.
$(iv)$ They also secrete modified polysaccharides, which accumulate between cells and fibres and act as matrix.