Question

Below are diagrams P, Q, R and S. Examine them.
         

1. Using observable features in the photographs, complete the dichotomous key given below. 
   1.  
      1. Animals with legs………………………………................go to 2
      2. Animals without legs…………………………………………....snake
   2.  
      1. Animals with two body parts .......................spider
      2. …………………………………………………………..........……go to 3
   3.  
      1. ………………………………………………locust
      2. Animals without wings…………..............Ant
2. In each case show steps followed to arrived at the identity. (4mks)

   Organism	Steps followed	Identity
   P		Locust
   Q		Ant
   R		Snake
   S		Spider

3. Using observable features only show how specimen P adapted for locomotion.

Answer 1

1. 1. 1. Animals with legs………………………go to 2
      2. Animals without legs……………………….snake
   2.  
      1. Animals with two body parts ……………spider
      2. animals with three body parts………go to 3 
   3.  
      1. animals with wings…………………… locust 
      2. Animals without wings…………………Ant
2. In each case show steps followed to arrived at the identity. (4mks)

   Organism	Steps followed	Identity
   P	...1a, 2b, 3a...	Locust
   Q	...1a, 2b, 3b...	Ant
   R	...1b...	Snake
   S	...1a, 2a...	Spider

3.  
   1. P has wings for flight
   2. 3 pairs of legs for walking and hoping for long distance i.e. legs for walking / strong hind legs for hopping.