Aiden Gill, Heidi Foxford and, Dorothy Warren Solutions for Chapter: Variation and Inheritance, Exercise 1: Exercise 1
Aiden Gill Science Solutions for Exercise - Aiden Gill, Heidi Foxford and, Dorothy Warren Solutions for Chapter: Variation and Inheritance, Exercise 1: Exercise 1
Attempt the practice questions on Chapter 4: Variation and Inheritance, Exercise 1: Exercise 1 with hints and solutions to strengthen your understanding. Cambridge Lower Secondary Science Stage 9: Workbook solutions are prepared by Experienced Embibe Experts.
Questions from Aiden Gill, Heidi Foxford and, Dorothy Warren Solutions for Chapter: Variation and Inheritance, Exercise 1: Exercise 1 with Hints & Solutions
Who invented the system of classification we use to classify organisms?

Why do scientists use classification keys?

Fatima collects leaves from four different types of trees. She is going to make an identification key so that each type of tree can be identified using its leaves.

Jalal finds a group of organisms in the school grounds. The diagram below shows the organisms he finds.
Jalal makes a table to record the characteristics of the organisms he finds.
Name of organism | Number of legs | Number of wings |
Stick insect | ||
Jumping-spider | ||
Meal moth | ||
Hoopoe bird |
Use the diagrams to complete the table. The first one has been done for you.

Name of organism | Number of legs | Number of wings |
Stick insect | ||
Jumping spider | ||
Meal moth | ||
Hoopoe bird |
Jalal uses the information in this table to construct a classification key. Complete the key by writing the missing question:

Construct the classification key:

Viruses cannot reproduce without invading a 'host cell'. Viruses are not put into any kind of kingdoms. Explain why.

Aristotle was a Greek scientist who developed the first classification system. He divided all the known organisms into two groups- the plants and the animals. Aristotle then divided each animal group into three smaller groups- land, water and air. Birds, bats and flying insects were grouped together as 'air animals'. We now know that Aristotle's classification system does not work. It groups organisms that are completely different to one another in the same group. Explain why Aristotle's classification of 'air animals' does not work.
