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Answers
a) i) Tissue A - Xylem
Tissue B- Phloem
ii) The structural components of tissue A are tracheids, vessels or tracheae, xylem fibres, xylem parenchyma and rays.
iii) The function of tissue B is the transportation of food and nutrients such as sugar from leaves to other parts of the plant.
iv) The most accurate way to estimate tree age is to count the annual rings of wood growth.
b) i) The fluid keeps the pleura moist and reduces friction between the membranes when you breathe.
ii) The centrosome plays an important role during cell division, when a special "spindle" of microtubules is constructed for the purpose of moving chromosomes around the cell.
iii)It provides support, structure, mechanical strength, and flexibility to the petiole, leaf veins, and stem of young plants, allowing for easy bending without breakage.
iv) The foramen magnum functions as a passage of the central nervous system through the skull connecting the brain with the spinal cord.
v) The main function of adipose tissue is to store energy in the form of lipids (fat).