8.2 Functions of the atmosphere

The main functions of the atmosphere are:

Activities:

1. Copy the dyagram in your notebook

2. Translate the diagram

8.1 Composition and structure of the atmosphere

The main atmospheric gases are:

  The structure of the atmosphere are:


Activities:
1. In wich layer of the atmosphere do meteorological phenomena such as rain and clouds occur?
2. Copy and complete the sentence: Atmospheric air is made up of 78% of ...... 21% of...... and other gases such as ......... and ...... .
3. Copy in your notebook the different layers in english.

5.2 The simplest invertebrates

Porifera

Porifera or sponges are aquatic animals and most of them are marine. They are attached to sand or rocks.

Cnidaria

Are aquatic animals and most of them are marine. For example, jellyfish,coral, sea anemones and hydra are cnidarian

Worms

The term worm includes animals with a soft, elongated body, without skeleton. The most important ones are platheyelminthes, nematodes and annelids.

ACTIVITIES:

1. Which of the following statements are true (T) and which are false (F)? 

1.  In oviparous animals, the egg develops inside the mother’s body. 
2.  Porifera live freely, floating on sea water. 
3.  Corals are porifera with the shape of a polyp and a skeleton. 
4.  Budding is a kind of sexual reproduction. 
5.  Cnidaria reproduce sexually and develop from eggs.
6.  In viviparous animals, the embryo develops inside the mother’s body. 
7.  Medusae are porifera without pores. 
8.  Swimming medusa have an umbrella shape. 
9.  Asexual reproduction happens through internal fertilization. 
10.  Porifera can reproduce sexually or asexually. 

2. Classify the next picture in platheyelmintes, nematodes or annelids:

  1

2

   3

5.1 The main characterictics of animals

Animals are aukaryotics and multicellular organisms. They usually have organs and systems that are highy developed and so they can perform their vital functions very efficiently.

Their vital functions are:

• Nutrition. They have organs that allow them to get large quantities of energy and nutrients.
• Interaction. They have sense organs, a nervous system and structures like legs, tentacles, wings....
• Reproduction: Animal reproduction can be asexual or sexual.

We can cassificate the animals in two big groups:

• Vertebrates. Have an internal skeleton with backbone.
• Invertebrates. Do not havean internal skeleton.

The main animals groups are:

http://www.edistribucion.es/anayaeducacion/8420042/SC1_UNI5/U05_01_EPI_01/05_1/index.html

1. Copy the diagram in your notebook, then click in the picture and do the exercise.

2. Write the meaning of: Backbone, skeleton and wing.

4.2 The kingdom funghi

Introduction to the kingdom of fungi.

There are about 40,000 different kinds of fungi.
These include:

*mushrooms
*moulds
*yeasts

Fungi are not green because they do not contain chlorophyll.
Because they are not green, fungi do not make their own food.

Most fungi feed on the remains of dead plants and animals.

Fungi are decomposers - they change dead things into a substance called humus.
Humus is rich in nutrients.
Soil rich in humus enables new strong plants to grow and provides a home for thousands of living things.

1. Why fungi are not plants?
2. Translate mushrooms, moulds and yeast an write a example of each one.

4.1 Ameba reproduction

1. What kingdom belong amebas?
2. What kind of reproduction is it?
3. What chacarteristics have this kind of reproduction?