a] Write two examples of sexually transmitted diseases caused by viruses and bacteria. b] Explain how the transmission of such diseases can be prevented?

(a) Explain the types of outreeding proccess employed to improve desrible qualities of animals . (b) Write any two proccess dealt with to increase the yeild and quality of milk in dairy farm management .

(a) In humans, males are heterogametic and females are homogametic, Explain. Are there any examples where males are homogametric and females are heterogametic ? (b) Also describe as to, who determines the sex of an unborn child ? Mension whether temperature has a role in sex determination.

If one of the sides and any other part (either an acute angle or any side) of a right angle triangle is known, the remaining sides and angles of the triangle can be determined. Do you agree? Explain with an example.

(a) State the central dogma in molecular biology. Who proposed it? Is it universally applicable? Explain. (b) List any four properties of a molecule to be able to act as a genetic material

Explain how marine animals can survive under ice on a frozen sea.

(a) How can we trace evolutionary realtionsbips ? (b) Define variation in relation to a species. Why is variation beneficial to the species.

(a) How can we trace evolutionary realtionsbips ? (b) Define variation in relation to a species. Why is variation beneficial to the species.

(a) For circuits used for transporting electric power, a low power factor implies large power loss in transmission. Explain. (b) Power factor can often be improved by the use of a capacitor of appropriate capacitance in the circuit. Explain.

List two ways in which animal dung can be utilized as a fuel. Out of these two which one do you think is better ? Justify your answer.