2nd Quarter Periodic Examination in Earth & Life Sciences REVIEW

During which era did dinosaurs evolve?

• Proterozoic Era

• Cenozoic Era

• Mesozoic Era

• Paleozoic Era

What are the first photosynthetic organisms that grow well on earth?

• Bryophyllum

• cyanobacteria

• zircon crystal

• stromatolites

Which types of organisms developed first due to the early environmental conditions on Earth?

• prokaryotic and anaerobic

• prokaryotic and aerobic

• eukaryotic and anaerobic

• eukaryotic and aerobic

What unique substance do researchers look after in their study of eukaryotes?

• fossils

• stromatolites

• mitochondria

• biomarkers

The study of history of life is significant in many aspects. The stromatolites played a significant role as a source of evidence. What is stromatolite?

• It consists of layered bacteria and sediment.

• It is formed during volcanic eruptions.

• It is found in animals

• It is produced through endosymbiosis.

What kind of organism first existed during the early development of Earth when oxygen was scarce?

• Anaerobic organism

• Mammal

• Protist

• Aerobic organism

Which of the following statements is NOT true on the evolution of multicellular organisms?

• They are believed to have evolved from single-celled prokaryotic organisms.

• The prokaryotic organisms that formed multicellular aggregates were like the cells of Cyanobacteria.

• They are formed from other multicellular colonial aggregates through cells specialization.

• The process of continuous specialization brought more complex organisms.

Why do you think the emergence of plants and animals came later than simple living organisms?

• Their existence is not that important on Earth

• Their size is too big that it takes longer time for development.

• These organisms composed of many nucleus compared to unicellular.

• The cell structures of these multicellular organisms are more complex.

Which statement is incorrect about living organisms?

• The eukaryotic organisms evolved from the unicellular prokaryotic.

• The earliest forms of life existed were the prokaryotes.

• Evolution of oxygen-producing organisms allow the increase in the atmospheric oxygen.

• Organisms did not change despite of the changes in the environment.

Place the following in the order of their appearance:

• a. 1, 2, 4, 3

• b. 2, 1, 4, 3

• c. 2, 1, 3, 4

• d. 1, 2, 3, 4