2. a) What is meant by the following terms; (i) polyploidy (8 marks) (ii) Artificial selection (4 marks) b) Explain how polyploidy arises in sexually reproducing plants. (5 marks) c) Describe how polyploidy & artificial selection will lead to formation of new species. (8 marks) SENIOR FIVE ORGANIC CHEMISTRY 1.Using suitable examples explain the following terms (a) Mechanism (b) Homolytic fission (c) Heterolytic fission (d) Electrophilic reaction (e) Nucleophilic reaction (f) Addition reaction (g) Elimination reaction (h) Substitution reaction (i) Chain reaction (j) Positive and Negative inductive effect 2. 25cm3 of a gaseous hydrocarbon P were mixed with 200cm3 of oxygen and exploded. After cooling, the residual gases occupied 137.5cm3. the volume was reduced by 100cm3 on exposure of the gases to Potassium hydroxide solution and the remaining gas was oxygen. a) Determine the molecular formula of P b) Write the possible structural formula of P and name them. S.5 Mathematics Answer all questions. 1. ABCD is a quadric lateral where A1 B1 C and d are the points (3,-1), (6, 0), (7, 3) and (4,2). Prove that the diagonals bisect each other at right angles. Hence find the area of ABCD. Prove that the point (5,-1) is on the perpendicular bisector of the line joining A(1, 3), to B(3,3). If D(h, k) is another point on this perpendicular bisector, find a relationship between h and k.
The roots of the equation
and . Find the values of + . and .
Hence determine the equation whose roots are
Solve the equations (a) + 2=0. 5. a) A particle moves in a straight line with uniform acceleration f. its initial velocity...