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Name Serene Xand identify the cycle. (ii) Identify processes A, B, Cand D. {ili) Name one microorga this cycle. (OR) (i) Give three ways in which communicable diseases spread. (ii) Why do typhoid and amoebic dysentery spread more during the monsoon season than at other times? 18. Describe the process of manufacturing rayon from wood pulp. 19. Can the biodiversity of a natural grassland be increased by introducing cattle (which were not originally present) into the area? Give reasons for your answer. (i) What is metamorphosis? Draw a diagram of the life cycle of a frog. (ii) Mention two conditions under whicha frog larva will not develop into an adult. 1, Give five ways in which the body changes in boys and girls during puberty. 27. When cheek cells are studied under a 9RO () woollen swe (c)_ silk shirt ? of open fires to light their way in nthe ae tunnels? microscope, a dark dot is observed inside each cell. What is this dot? 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