(a) A child belongs to blood group 0 and the mother be-longs to group B. With the aid of genetic cross, state the possible blood groups of the father.

 (b) (i) Name two forms of adaptive communication in animals

(ii) State two reasons why organisms communicate with one an-other.

(a) Explain briefly the process of perceiving smell in humans.

(b) State the adaptive features of the egg of a domestic fowl

(c) (i) What are autotrophs?
(ii) Name two unicellular organisms that are autotrophs

(d) State five functions of the World Health Organisation

(e) Name two example each of plants and animals that live in a freshwater pond.

(f) In the table below, state five differences between the skin of a mammal and the epidermis of a leaf.

(g) A farmer has two plots of land; plots A and B. on Plot A the farmer planted several seeds of maize. On plot B, the farmer planted several seeds of maize and pepper in a small area. What type of competition would be observed on
(i) Plot A 
(ii) Plot B

(a) (i) List three forms in which living cells exist

(ii) Give one example each of the forms listed in 1 (a)(a)

(b) Make a diagram, 6 cm — 10 cm long, of a typical plant cell and label fully

(c) (i) In a tabular form, state three differences between a plant cell and animal cell.

(ii) State three similarities between a plant cell and animal cell. 
 

(a) In sequence, name the organs that constitute the alimentary canal of humans

(b) State: (i) three structural differences; (ii) three structural similarities; between the alimentary canal of a bird and human.

(c) Explain briefly how the dentition of herbivores is adapted for feeding

(d) State two roles of the pancreas in digestion 

(a) (i) What is a habitat?

(ii) Explain briefly three roles of a decomposer in an ecosystem.

(b) Explain briefly energy flow in a freshwater habitat.

(c) (i) State three harmful effects or microorganisms to plants

(ii) State six beneficial effects of microorganism to humans.