State the functio

a) Parenchyma: i. It serves as a packing tissue to fill the spaces between other tissues and maintain the shape and firmness of the plant. ii. It stores food, performs photosynthesis and secretion in plants.

(b) Collenchyma: i. These cells provide mechanical support to growing parts of the plants. ii. When these cells contain chloroplast, they perform photosynthesis.

(c) Sclerenchyma: i. These cells are usually found associated with other cell types and give mechanical support to the plants. ii. They provide strength, rigidity, flexibility, and elasticity to the plants.

OR

(i) Once someone gets a disease, his or her body functions get damaged and may never recover completely. (ii)The treatment of a disease takes time so the person is likely to be bedridden for sometime, even if he is given proper treatment. (iii) The person suffering from an infectious disease can serve as the medium for further spread of infection to other people.