BIOLOGY ACTIVITIES ESO 2

END OF TERM ACTIVITIES

You must do these activities well presented on white paper and hand them in before the 12^th June.

1.       Identify the words in the list below as elements of the biocenosis or biotope of an ecosystem:

a) soil

b) wind

c) buildings

d) trees

e) energy

f) microorganisms

g) algae

h) temperature

i) sponges

j) humidity

k) pollution

l) dead animals

2.  Primary consumers feed on all types of plants. Where can you find most primary consumers in high mountains or in a forest? Explain your answer.

3.  Look at these pictures. Explain what biotic relations are represented in each one? Are these relations intraspecific or interspecific?

4. Which graphic representation gives more information about ecosystems: a food chain or a food web? Why do you think this is?

5. Copy and complete the table.

ORGANIC BIOMOLECULES	FUNCTION	EXAMPLES
CARBOHYDRATES
LIPIDS
PROTEINS
NUCLEIC ACIDS

6.  Draw a picture of a plant cell. Label these parts:

Cell wall, cell membrane, nucleus, cytoplasm, vacuoles, chloroplasts, mitochondria

Write 5 differences between animal and plant cells.

7. Saccharomyces cerevisae  is a unicellular fungus, yeast, which is used to make bread. In the absence of oxygen, it breaks down the sugars in flour, producing alcohol (ethanol) and carbon dioxide.

a) What type of chemical reaction is taking place, anabolic or catabolic? Explain.

b) The carbon dioxide released is responsible for the sponginess of the bread. What happens to the alcohol?

8. Classify these cells as autotrophic or heterotrophic.

a) an algae cell

b) a muscle cell

c) leaf cells on an olive tree

d) root cells in a geranium

e) a skin cell

f) protozoa

c) a cyanbacteria

d) a green stem cell.