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5
Cells and the simplest organisms
1. Which of the following have cells?
Cork, plastic bottle, pear, rock, blood, glass of water.
2. In which part of the cell do the following functions take place?
a) Contains genetic material.
b) Produces energy for the cell.
c) Regulates the entrance and exit of substances.
d) Where the organelles are located.
e) Contains nutrients and waste products.
f) Carries out photosynthesis.
g) Protects plant cells.
3. Complete the following table:
PHOTOSYNTHESIS
RESPIRATION
Where does it take place?
What does it need?
What does it release?
What is its function?
4.
Are these statements true (T) or false (F)? Correct the false ones:
a) Plant cells are autotrophs and animal cells are heterotrophs. b) Only animal cells breathe. c) Animal cells can make compounds from carbon dioxide and water. d) Plant cells obtain their nutrients from organic matter made by other organisms.
e) Only plant cells can carry out photosynthesis. 5. Explain how each of the following cells move:
Photocopiable page/University of Dayton Publishing
a) Sperm cell
Unit 5
Cells and the simplest organisms
b) Amoeba c) Paramecium
Unit 5. Cells and the simplest organisms
6. Why is cell reproduction necessary in unicellular and multicellular organisms?
7. To which vital functions of cells do these processes correspond?
a) Capturing of solid particles.
b) Formation of new cells.
c) Detection of light and move towards it.
d) Ingestion of organic matter.
e) Formation of complex molecules from simple molecules.
8. Which of these characteristics belong to protozoa?
a) They have prokaryotic cells.
b) They are made up of a single cell.
c) They form spores.
d) They have chlorophyl.
e) They are heterotrophs.
9. Are these statements about bacteria true (T) or false (F)? Correct the false ones:
a) They survive in any type of environment.
b) They are multicellular organisms.
c) They reproduce through binary fission.
d) They have a capsule in the form of a polyhedron which surrounds the membrane.
e) Their cell is prokaryotic.
10. Do you know of any food that is made with microorganisms? Give some examples.
Photocopiable page/University of Dayton Publishing
11. Which group of microorganisms cause illness in human beings? What are these organisms called?
12. Are these statements about viruses true (T) or false (F)? Correct the false ones:
a) Some are beneficial to human beings.
b) They can only be seen with an electronic microscope.
c) They decompose organic matter.
d) They have autotrophic nutrition.
e) They are made up of cells.
Unit 5
Cells and the simplest organisms