Construct a dichotomous key for leaves S, Q, R, O, P and list four characteristics of Class Insecta.

Here is the solution for question 6:

a) To construct a dichotomous key, we identify distinguishing features of the leaves (S, Q, R, O, P).

Dichotomous Key for Leaves

1a. Leaf is simple (one blade per petiole) ................................................................. Go to 2
1b. Leaf is compound (multiple leaflets per petiole) ..................................................... Go to 4

2a. Leaf margin is serrated ..................................................................................... S
2b. Leaf margin is smooth ...................................................................................... Go to 3

3a. Leaf is circular/round in shape ............................................................................ R
3b. Leaf is ovate in shape ....................................................................................... O

4a. Leaf has many leaflets arranged along a central stalk (pinnately compound) ................. Q
4b. Leaf has three leaflets ...................................................................................... P

b) Four characteristics of Class Insecta are:

• Their body is divided into three distinct regions: head, thorax, and abdomen.
• They possess three pairs of jointed legs (total of six legs) attached to the thorax.
• They have one pair of antennae on their head.
• Most insects possess one or two pairs of wings attached to the thorax.