Earth and Life Science SHS 15.1 The Evolving Concept of Life PDF

Lesson 15.1 The Evolving Concept of Life  Learn about it! Life Science This is a collection of disciplines that is made up of theories and principles that tackle living organisms. A mangrove swamp has many organisms in it...

Lesson 15.1 The Evolving Concept of Life  Learn about it! Life Science This is a collection of disciplines that is made up of theories and principles that tackle living organisms. A mangrove swamp has many organisms in it  Learn about it! Characteristics of Organisms They respond to their environment. They grow and develop. They are capable of reproduction. They exhibit metabolism. They maintain homeostasis. They are made up of cells.  Learn about it! Response to Environment Living things respond to changes around them to survive. Plants respond to changes in the environment  Learn about it! Growth and Development Growth is an increase in size, development is the differentiation of cells for specialization. Humans grow and develop from the womb.  Learn about it! Capable of Reproduction Reproduction refers to the creation of offspring. Sperm and egg cell  Learn about it! Exhibit Metabolism Metabolism refers to the total chemical reactions in an organism. Chemical structure of myoglobin  Learn about it! Maintain Homeostasis Homeostasis is the body’s state of equilibrium. Huddling for warmth  Learn about it! Made of Cells All organisms are made of cells which are the basic units of life. Blood cells There are several theories as to how life on Earth began.  Learn about it! ABIOGENESIS BIOGENESIS Also known as States that, every living spontaneous generation. thing came from a pre- States that, life can arise existing living thing. from non-living things.  Learn about it! Spontaneous Generation The theory of spontaneous generation described that life comes from lifeless or non- living material through a mysterious process. Spontaneous generation  Learn about it! 1. ARISTOTLE Greek scientist and philosopher. He proposed the spontaneous generation theory or Abiogenesis 384-322 B.C.E  Learn about it! 2. JAN BAPTIST VAN HELMONT 17TH century Flemish Scientist, proposed that mice could arise form rags and wheat kernels left in an open container for 3 weeks.  Learn about it! 3. FRANCESCO REDI 1626-1697 Italian scientist He demonstrated that maggots do not just appear spontaneously, but are produced from the eggs of flies. He disproved the Spontaneous Generation of Aristotle  Learn about it! 3. FRANCESCO REDI  Learn about it! 4. JOHN TURBERVILLE NEEDHAM 1713-1781 English Biologist He proved that spontaneous generation can occur under the right conditions.  Learn about it! 4. JOHN TURBERVILLE NEEDHAM Conclusion: Flaw with his Life arose experiment: spontaneously The flask was from not the broth sealed itself, and even was after boiling, because exposed to microorganisms the air. were still present.  Learn about it! 5. LAZZARO SPALLANZANI 1729-1799 Italian scholar He disproved the theory of spontaneous generation.  Learn about it! 5. LAZZARO SPALLANZANI Conclusion: Life doesn't arise spontaneously but comes from microorganisms in the air. His sealed flasks, preventing air entry, remained sterile, while open ones grew microbes.  Learn about it! 6. LOUIS PASTEUR 1822-1895 French chemist and microbiologist He disproved the theory of spontaneous generation.  Learn about it! 6. LOUIS PASTEUR  Learn about it! 6. LOUIS PASTEUR  Learn about it! 6. LOUIS PASTEUR Pasteur articulated “Omne vivum ex vivo” (Life only comes from life) Pasteur recounted his famous swan-neck flask experiment, stating that “life is a germ and a germ is life”  Learn about it! Panspermia This states that life on Earth was seeded from a celestial source. A meteorite  Learn about it! Primordial Soup Theory Proponents: ✓ Alexander Oparin ✓ John Haldane According to this theory, life started in a primordial soup of organic molecules. The primordial soup theory  Learn about it! Primordial Soup Theory The theory states that if energy is added to the gases that made up Earth's early atmosphere, the building blocks of life would be created. These monomers would collect in pools of water, creating a soup. Eventually the monomers would bond, creating polymers, and the polymers would join to create early life forms. The primordial soup theory