AP BIOLOGY

Detailed explanation-1: -The products of photosynthesis (mainly the sugar sucrose) are a major component of the substance found in the phloem, called assimilate. Ions, amino acids, certain hormones, and other molecules are also found in assimilate. The movement of assimilate is called translocation, or assimilate transport.

Detailed explanation-2: -In plants, it refers to the processes of photosynthesis and the absorption of raw materials by which plants derive their nutrition. Examples of assimilation are photosynthesis, nitrogen fixation, and the absorption of nutrients after digestion into the living tissue.

Detailed explanation-3: -Final answer: Tracheids are not the element of phloem tissue.

Detailed explanation-4: -The phloem consists of sieve elements, companion cells, phloem parenchyma cells and phloem fibers. Other cell types may be found in the phloem of certain plant species. The functional units for long distance translocation and signal distribution are sieve tubes.