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 6 0 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 6 0 Jumping spider 8 0 Meal moth 6 4 Hoopoe bird 2 2 Like any insect, stick insects have six legs, two antennae and their body is divided in three segments; head, thorax and abdomen. Jumping spiders are small and scrappy carnivores. Jumping spiders have 8 legs. Indian meal moth has hind wing that is broader than the front wing and fringed with long hair-like scales. Hoopoe has rounded wings with conspicuous black and white barring. This bird performs powerful flight with slow wing-beats. The flight is undulating, performed over short distances, from perch to perch.

Name of organism Number of legs Number of wings Stick insect 6 0 Jumping spider 8 0 Meal moth 4 4 Hoopoe bird 2 2 Jalal uses the information in this table to construct a classification key. Complete the key by writing the missing question:

Jalal uses the information in the table to construct a classification key. Stick insect, meal moth and jumping spider belong to the phylum Arthropoda. Hoopoe bird belongs to Class Aves, they have a distinctive crown of feathers on their head. All these animals belong to Kingdom Animalia. Only the Hoopoe bird is a vertebrate, all other animals are invertebrates.

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Lower Secondary Stage 9

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Who invented the system of classification we use to classify organisms?

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Important Questions on Variation and Inheritance

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Lower Secondary Stage 9

IMPORTANT

Cambridge Lower Secondary Science Stage 9: Workbook>Chapter 4 - Variation and Inheritance>Exercise 1>Q 5

Why do scientists use classification keys?

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Lower Secondary Stage 9

IMPORTANT

Cambridge Lower Secondary Science Stage 9: Workbook>Chapter 4 - Variation and Inheritance>Exercise 1>Q 6

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.

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Lower Secondary Stage 9

IMPORTANT

Cambridge Lower Secondary Science Stage 9: Workbook>Chapter 4 - Variation and Inheritance>Exercise 1>Q 7

Jalal finds a group of organisms in the school grounds. The diagram below shows the organisms he finds.
Question Image
Jalal makes a table to record the characteristics of the organisms he finds.

Name of organism	Number of legs	Number of wings
Stick insect	$6$	$0$
Jumping-spider
Meal moth
Hoopoe bird

Use the diagrams to complete the table. The first one has been done for you.

HARD

Lower Secondary Stage 9

IMPORTANT

Cambridge Lower Secondary Science Stage 9: Workbook>Chapter 4 - Variation and Inheritance>Exercise 1>Q 7

Name of organism	Number of legs	Number of wings
Stick insect	$6$	$0$
Jumping spider	$8$	$0$
Meal moth	$4$	$4$
Hoopoe bird	$2$	$2$

Jalal uses the information in this table to construct a classification key. Complete the key by writing the missing question:
Question Image

MEDIUM

Lower Secondary Stage 9

IMPORTANT

Cambridge Lower Secondary Science Stage 9: Workbook>Chapter 4 - Variation and Inheritance>Exercise 1>Q 7

Construct the classification key:
Question Image

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Lower Secondary Stage 9

IMPORTANT

Cambridge Lower Secondary Science Stage 9: Workbook>Chapter 4 - Variation and Inheritance>Exercise 1>Q 8

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

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Lower Secondary Stage 9

IMPORTANT

Cambridge Lower Secondary Science Stage 9: Workbook>Chapter 4 - Variation and Inheritance>Exercise 1>Q 9

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.

MEDIUM

Lower Secondary Stage 9

IMPORTANT

Cambridge Lower Secondary Science Stage 9: Workbook>Chapter 4 - Variation and Inheritance>Exercise 2>Q 2

Which of the following best describes a gene? Tick one box only.

Who invented the system of classification we use to classify organisms?

Important Questions on Variation and Inheritance

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