Observation

This was the most unpopular question among the candidates. The few candidates that attempted it performed badly. Only a few candidates could name the instruments used for collecting soil organisms from a soil sample; and collecting tiny insects from a leaf or a stem. Candidates generally performed poorly in this question.
The expected answers are:

1. (i) Instrument for collecting soil organisms from a soil sample
   

   Sieve; Tullgren funnel

   (ii)Instrument for collecting soil organisms from a soil sample

   Pooter

2. Diagram/drawing of pooter

   

 

3. Trichonympha
   Protozoa living in the gut of a termite; helps the termite to digest cellulose; while the Protozoa/Trichonympha enjoy protection and food in return from the termite.

    

   Sea anemone attaching itself to the shell of hermit crab; thereby enjoying pieces of leftover food therein. The hermit crab in turn enjoys protection against predators/the sea anemone’s stings prevent the predators from harming the hermit crab.

    

   Algae and fungi in a Lichen; Lichen is made up of a fungus and a unicellular alga living together; The green alga produces food/photosynthesis for the association; the fungus protects the alga/ absorbs water from the surroundings.

   Rhizobium sp. Nitrogen - fixing bacteria and root nodules of leguminous plants;
   The Rhizobium fixes atmospheric nitrogen directly into the plant while rhizobium enjoys shelter/food/nutrients from the plant.and any correctly named symbiotic relationship

   Note: the two organisms must be named to score the 1 mark for naming