Biodiversity: Unit 2: Diversity of animals Flashcards Preview

Grade 7: Term 1: Natural Sciences > Biodiversity: Unit 2: Diversity of animals > Flashcards

Flashcards in Biodiversity: Unit 2: Diversity of animals Deck (17)
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1

What is a vertebrate?

A vertebrate is an animal with a backbone.

2

What is an invertebrate?

An invertebrate is an animal without a backbone.

3

How many classes or groups are vertebrate animals classified into?

5.

4

What are the 5 classes vertebrates are classified into?

- Fish
- Amphibians
- Reptiles
- Birds
- Mammals

5

1.1. DISTINGUISHING CHARACTERISTICS OF FISH
- _____ vertebrates, which means that they live in water
- Cannot control ____ temperature, so they need heat from the environment to keep them warm
- Their skin is generally covered with _____
- Limbs are modified into ____ for swimming
- Breathe with _____
- Lay ____ that must be in water
- Examples are goldfish, catfish and shark

- AQUATIC vertebrates, which means that they live in water
- Cannot control BODY temperature, so they need heat from the environment to keep them warm
- Their skin is generally covered with SCALES
- Limbs are modified into FINS for swimming
- Breathe with GILLS
- Lay EGGS that must be in water
- Examples are goldfish, catfish and shark

6

1.2. DISTINGUISHING CHARACTERISTICS OF AMPHIBIANS
- Amphibians can live on ____ but must return to water to reproduce
- Need heat from the environment to keep ____, as they cannot control their ___ temperature
- Have ____ skin that does not have scales, feather or hair on it
- They lay ____ in water. The eggs hatch into _____ called tadpoles that breathe with ____
- Adults develop ____ and can live outside water because they can breathe ____
- Examples are frogs, toads and salamanders

- Amphibians can live on LAND but must return to water to reproduce
- Need heat from the environment to keep WARM, as they cannot control their BODY temperature
- Have MOIST skin that does not have scales, feather or hair on it
- They lay eggs in water. The eggs hatch into LARVAE called tadpoles that breathe with GILLS
- Adults develop LUNGS and can live outside water because they can breathe AIR
- Examples are frogs, toads and salamanders

7

1.3. DISTINGUISHING CHARACTERISTICS OF REPTILES
- Can live on land or ____
- Cannot ______ body temperature, so they ___ on the environment around them to keep warm
- They are covered with _____
- To reproduce, they lay ____ with tough, waterproof shells on ___ land, even if the animals lives in water
- They have ____ for breathing
- Examples are snakes, sea turtles, crocodiles and tortoises

- Can live on land or WATER
- Cannot CONTROL body temperature, so they RELY on the environment around them to keep warm
- They are covered with SCALES
- To reproduce, they lay EGGS with tough, waterproof shells on DRY land, even if the animals lives in water
- They have LUNGS for breathing
- Examples are snakes, sea turtles, crocodiles and tortoises

8

1.4. DISTINGUISHING CHARACTERISTICS OF BIRDS
- They have a ______ body temperature even when it is very hot or very ____
- Their skin is covered with _______
- Their bones are _________ and usually hollow
- Their 2 front limbs form ______. Most birds can fly, but some others ______ fly.
- Examples are penguins, ostriches, parrots and chickens

- They have a CONSTANT body temperature even when it is very hot or very COLD
- Their skin is covered with FEATHERS
- Their bones are LIGHTWEIGHT and usually hollow
- Their 2 front limbs form WINGS. Most birds can fly, but some others CANNOT fly.
- Examples are penguins, ostriches, parrots and chickens

9

1.4. DISTINGUISHING CHARACTERISTICS OF MAMMALS
- Most mammals live on land, but can also be _______
- Mammals have a _______ body temperature even the environment is very ___ or very cold
- Their bodies are covered with hair or ___
- Most mammals have _____ glands on their skin
- They have milk ______ to feed their young
- Born alive rather than hatching from ____
- Have _____ for breathing
- Examples are rabbits, whales, humans and elephants

- Most mammals live on land, but can also be AQUATIC
- Mammals have a CONSTANT body temperature even the environment is very HOT or very cold
- Their bodies are covered with hair or FUR
- Most mammals have SWEAT glands on their skin
- They have milk GLANDS to feed their young
- Born alive rather than hatching from EGGS
- Have LUNGS for breathing
- Examples are rabbits, whales, humans and elephants

10

How many classes or groups are invertebrate animals classified into?

2.

11

What are the 2 classes vertebrates are classified into?

- Arthropods
- Molluscs

12

What do invertebrates all have in common?

They do not have an internal skeleton with a backbone.

13

2.1. DISTINGUISHING CHARACTERISTICS OF ARTHROPODS
- They have a hard _____ covering (exoskeleton)
- They have _____ legs, which are legs made up of different parts and a _______ joint
- Their bodies are divided into 3 ____ parts: the head, ______ and abdomen
- The body parts are divided into ______ called segments
- Examples are ants

- They have a hard OUTER covering (exoskeleton)
- They have JOINTED legs, which are legs made up of different parts and a CONNECTING joint
- Their bodies are divided into 3 MAIN parts: the head, THORAX and abdomen
- The body parts are divided into SECTIONS called segments
- Examples are ants

14

What are the main classes of arthropods?

- Insects
- Arachnids
- Crustaceans

15

2.1.1. DISTINGUISHING CHARACTERISTICS OF THE MAIN CLASSES OF ARTHROPODS
- Although they share the distinguishing characteristics of arthropods, there are differences:
- The number of _____ divisions
- The _____ of legs
- The number of ______

- Although they SHARE the distinguishing characteristics of arthropods, there are differences:
- The number of BODY divisions
- The NUMBER of legs
- The number of ANTENNAE

16

What are antennae?

Antennae are feelers used for sensing the environment.

17

2.2. DISTINGUISHING CHARACTERISTICS OF MOLLUSCS
- Have ____ bodies that are usually covered by a ____
- Their bodies are divided into the ____, muscular foot and the visceral ____. The body organs are in the visceral hump
- They do not have legs but move with a muscular ____
- Some molluscs have ______ for sensing
- Examples are snails, mussels, oysters and barnacles

- Have SOFT bodies that are usually covered by a SHELL
- Their bodies are divided into the HEAD, muscular foot and the visceral HUMP. The body organs are in the visceral hump
- They do not have legs but move with a muscular FOOT
- Some molluscs have TENTACLES for sensing
- Examples are snails, mussels, oysters and barnacles