math8bhisa

xviii)Deoxyribonucleic acid is normally a ………. molecule with capacity for self-replication .
(xix) The selection done by man is called ………..selection.
(xx) Animal in an ecosystems are………..

1. Answer ALL questions. (12 marks)
   (a) Differentiate fleshy fruits and dry fruits.
   (b) Give characteristics of mammals dealing with skeletal and food habits.
   (c) State the effect of temperature on the rate of photosynthesis.
   (d) State what you understand of respiration and name its two types.
   (OR)
   Explain how absorption of mineral salt takes place in plants.
   2H2O + 2Br2 → O2 + 4HBr
   (f) Which elements (s) N or P or K is not suitable for seed bearing and for leaf crops?
2. Answer any FIVE questions. (20 marks)
   (a) What volume at STP of oxygen and what mass of aluminium will be liberated during electrolysis by a
   charge of one Faraday?
   (b) Write balance equations for the following reactions.
   (i) H2S + KMnO4 + H2SO4 → MnSO4 + K2SO4 + H2O + S
   (ii) CuO + H2 → Cu + H2O
   (c) An atom A has an atomic number of 12 whereas an atom B has an atomic