The Evolving Concept of Life

When did the early forms of life exist?

• 1.5 billion years ago

• 2.5 billion years ago

• 3.5 billion years ago

• 4.5 billion years ago

Where is the first form of life seen?

• microfossils

• layer of rocks

• oceanic crust

• sediments

Which of the following is the first photosynthetic organism to form?

• cyanobacteria

• algae

• fungi

• gymnosperm

Which is not true about the prokaryotes?

• They are simple in structure, small, and unicellular.

• They do not have nucleus.

• They survive in extreme conditions.

• They are not capable of making their own food.

Which of the following processes brought changes in the early atmosphere?

• earthquake

• extreme condition

• photosynthesis

• volcanic eruption

Which of the following statements is not correct?

• Photosynthetic organisms decreased the amount of oxygen in the atmosphere.

• Organisms change over time as a result of adaptation for survival.

• Multicellular organisms evolved from unicellular eukaryotes.

• The earliest forms of life were the prokaryotes.

All of the following statements are true about the evolution of multicellular organisms except:

• They are formed from multicellular colonial aggregates through cell specialization.

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

• The process of continuous specialization brought more complex organisms.

• The single-celled organisms that formed multicellular aggregates were like the cells of algae.

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

• They are too big and take time to form.

• They are the least important factor in the environment.

• Their cell structures are more complex.

• They contain more nucleus compared to lower forms of organisms.

Considering the present condition of the environment, do you think living organisms are still evolving today?

• Yes, because humans continuously alter the environment that made evolution among living organisms happen.

• No, because the environment remains favourable to living organisms.

• Yes, because it is a natural phenomenon which we cannot stop from happening.

• No, because there is no condition outside their bodies that will trigger evolution.