NS3: UNIT 6 INVERTEBRATES

 

UNIT 6: INVERTEBRATES

     6.1. Invertebrates groups

     6.2. Insects

6.1. Invertebrates groups

 

-        We can classify invertebrates in groups.

-        The most important ones are: Arthopods and Mollucs, but there are more groups.

 

Ø ARTHOPODS.- They are THE BIGGEST group. There are four subgroups:

 

·       INSECTS. Example: fly( mosca)

·       MYRIAPODS.-Example: centipede ( ciempiés)

·       ARACHNIDS.-Example: spider ( araña)

·       CRUSTACEANS.-Example: crab ( cangrejo)

 

Ø MOLLUSCS.-These are second biggest group. There are Three subgroups:

 

·       GASTROPODS. Example: snail( caracol)

·       BIVALVES.-Example: mussels ( mejillones)

·       CEPHALOPODS.-Example: squid ( calamar )

 

v Activities

1.- Write the most important groups of invertebrates.

The most important groups are: Arthropods and Molluscs.

2.- Which are the four subgroups of Arthropods?.

·       INSECTS.

·       MYRIAPODS.

·       ARACHNIDS.

·       CRUSTACEANS

3.-Which are the three subgroups of  Molluscs?.

·       GASTROPODS.

·       BIVALVES.

·       CEPHALOPODS

 

4.- Choose true or false.

- Antis a Molluscs……FALSE…………

- Spider is an Arachnid……TRUE…….

- Snail is a Gastropods………TRUE……………..

 

6.2. Insects

 

- There are one million of species.

- They have three  main sections: head, thorax and abdomen.

- Some examples are: mantis, ant, grasshoper.

 

Ø THE LIFE CYCLE OF INSECTS WITH WINGS

 

-        There are insects such as butterfly which change though  the metamorphosis.

-        There are four steps:

o  1st step.-An adult butterfly lays eggs.

o  2nd step.-Caterpillars. ( Gusano de seda)

o  3rd step.-Chysalis( capullo)

o  4th step.-Adult butterfly.

 

v Activities

1.- Write the three parts  of an insect.

They have three  main sections: head, thorax and abdomen.

 

    2.- List some examples of insects.

Some examples are: mantis, ant, grasshoper.

 

3.- Write the four steps of a butterfly metamorphosis

 

o  1st step.-An adult butterfly lays eggs.

o  2nd step.-Caterpillars. ( Gusano de seda)

o  3rd step.-Chysalis( capullo)

o  4th step.-Adult butterfly.