WAEC Biology 2018 Past Questions

Practice each question, then open it to see the full details.

Question 2

(a). Name the gases involved in the photosynthesis of a plant.

(b) State one role each of the gases named in 2 (a).

(c) (i) What is a variegated leaf?
(ii)Which part of the variegated leaf would test positive when treated with iodine solution?
(iii) State two reason for the answer in 2(c) (ii).
(iv) Name one mineral element required by plants for the formation of the part that would test positive in 2(c)(ii).

(d) The table below indicates different methods by which organism obtain food. Place the following organism under the heading in the table below:  Human, Mushroom, Venus flytrap, Waterleaf plant, Tapeworm, Elephant grass, Housefly, Lichen, Spirogyra, Rhizopus. 

Mode of Nutrition
Holozoic Parasitic Symbiotic Saprophytic  Autotrophic
         
         
         
         


 

Theory
Question 5

(a)(1) Explain briefly chemosynthesis as a mode of nutrition.
(ii) Give two examples of organism that carry out chemosynthesis.

(b) List three gases in the atmosphere with their percentage composition. 

Gases in the atmosphere Percentage composition
   
   
   


(c) (i) State four characteristics of a salt marsh habitat.
(ii) Explain briefly how plants are modified for anchorage in a salt marsh habitat.

(d) (i) List four bacterial disease associated with poor food hygiene.
(ii) State three effects of poor food hygiene.

(e) A person was involved in a car accident and became unconscious due to excessive blood loss. Explain briefly how the blood lost could be restored. 

(f) State three differences between tillage and bush burning as farming practices. 

Tillage Bush burning
   
   
   


 

Theory