Origin of Life

1. 1. Name the four gases present in the primitive atmosphere of the earth.

Answer explanation

The four gases present in the primitive atmosphere of the Earth were methane (CH4), ammonia (NH3), water vapor (H2O), and carbon dioxide (CO2). These gases contributed to the early conditions necessary for the development of life.

2. Name two sources of energy which was used for chemical combination in primitive atmosphere.

What are ‘coacervates’?

In the origin of life, first large molecules were formed from inorganic compounds. Name any two such large molecules. ........................................................................................

The primitive environment was reducing because in it

Which of the following is NOT a property of life?

• Energy utilization

• Order

• Movement

• Homeostasis

The process of inductive reasoning involves

• the use of general principles to predict a specific result.

• the generation of specific predictions based on a
  belief system

• the use of specific observations to develop general principles.

• the use of general principles to support a hypothesis.

A hypothesis in biology is best described as

• a possible explanation of an observation.

• an observation that supports a theory.

• a general principle that explains some aspect of life.

• an unchanging statement that correctly predicts some
  aspect of life

A scientific theory is

• a guess about how things work in the world.

• a statement of how the world works that is supported by
  experimental data.

There are four conditions required for chemical evolution. Which of the lists below best represents these conditions?

• oxygen absent- inorganic molecules present - high energy input – adequate time

• oxygen present - inorganic molecules - adequate time - hydrogen and helium in atmosphere

• oxygen absent - organic polymers present - low UV radiation - adequate time

• d. oxygen present - organic polymers present - ozone present - adequate time