UNIT 8: THE EARTH, A LIVING PLANET

All living things are made of cells. An organism formed by one cell is called

unicellular organism. Ex: Bacteria An organism formed by many cells is called

multicellular organism. Ex: A dog

TYPES OF CELLS Prokaryotic cells: They don’t have a

nucleus. Eukaryotic cells: They have a nucleus and

many organelles. They can be: Animal cell Plant Cell

Levels of organization of living things

The living things perform three vital functions: nutrition, interaction and reproduction.

Nutrition:Autotrophic nutrition: They produce their own

food. Ex: PlantsHeterotrophic nutrition: They eat other

organisms. Ex: Animals Reproduction:

Asexual: Produces identical copies of itself.Sexual: Two living things join and provide

gametes.

ACTIVITIES

1. The following organisms have a sexual or asexual reproduction? A bacterium that produces two identical bacteria. Fish that lay eggs in the water.

2. Mould grows and feeds on food leftovers. Do you think it is autotroph or heterotroph?

Explain your answer.

3.Draw in your notebook a prokaryotic cell and eukaryotic cell. Label the elements in English and Spanish.

4. Match the words:An insect Prokaryotic cellAn oak tree Plant eukaryotic cellA bacteria Animal eukaryotic cell

5. Copy the table in your notebook and mark with a X what you can see in each type of cell. Prokaryotic

cellEukaryotic animal cell

Eukaryotic plant cell

Plasmatic membrane

Cellular wall

Nucleus

Chloroplasts

Vacuoles

Mitochondria