intro to life science grade 12 hums.pptx

life science powerpoint

1. LIFE SCIENCE INTRODUCTION TO LIFE SCIENCE MARK O. AGUSTIN, LPT

2. The Evolving Concept of Life Lesson 1 Classical Experiments to first life Lesson 2 Early Forms of Life Lesson 3 Unifying Themes in the Study of Life Lesson 4 CONTENT

3. The Evolving Concept of Life LESSON 1

4. FOSSILS( MICROFOSSILS) CYANOBACTERIA 3.5 BILLIONS YEARS AGO PROKARYOTES ATMOSPHERE DISCOVERY OF THE SCIENCTIST EARLY STAGE OF EARTH ANAEROBIC EVOLVING OF UNICELLULAR TO MULTICELLULAR ORGANISM

5. RESPONSE TO THE ENVIRONMENT MADE UP OF CELLS HOMEOSTASIS GROW AND DEVELOP REPRODUCTION METABOLISM CHARACTERISTIC OF ORGANISMS f

6. THE CONCEPT OF DIVINE CREATION IS THAT ALL LIFE FORMS EXISTING TODAY HAVE BEEN CREATED BY A SUPREME BEING. CREATION THEORY

7. ALSO KNOWN AS “SPONTANEOUS GENERATION” IS THE IDEA THAT LIFE COULD APPEAR FROM A NON- LIVING MATERIAL. ABIOGENESIS THEORY

8. greek philosopher in the 6h Century BCE. Anaximander Aristotle The History of Animals spontaneous generation adapted and expanded Anaximander’s idea. some organisms appeared from inanimate object spontaneously. a process thast transmuted lifeless object to living oganisms by supernatural means ABIOGENESIS

9. STATES THAT LIFE CAN ONLY COME FROM LIFE, AND IT REFERS TO ANY PROCESS BY WHICH A LIFEFORMS CAN GIVE RISE TO OTHER LIFEFORMS. BIOGENESIS THEORY

10. ALSO CALLED AS “EXOGENESIS”. THIS SUGGESTED THAT BUILDING BLOCKS OF LIFE CAME FROM ANOTHER PLANET. THEORY of PANSPERMIA FRED HOYLE

11. STATES THAT THE VENTS PROVIDE AN IDEAL ENVIRONMENT WITH ALL THE INGREDIENTS NEEDED FOR MICROBIAL LIFE RO EMERGE. DEEP SEA HYDROTHERMAL VENT THEORY

12. STATES THAT LIFE STARTED IN A PRIMORDIAL SOUP OF ORGANIC MOLECULES. SOME FORM OF ENERGY FROM LIGHTNING COMBINED WITH THE CHEMICALS IN THE ATMOSPHERE TO MAKE THE AMINO ACIDS PRIMORDIAL SOUP THEORY

13. STATES THAT CHANGES OCCUR AT THE MOLECULAR LEVEL IN ORGANISM OVER A PERIOD OF TIME. THEORY OF BIOCHEMICAL EVOLUTION

14. Classic Experiments on the Evolution of Life LESSON 2

15. FRANCISCO REDDI’S EXPERIMENT 1. How do you describe the existense of maggots(lifeforms) in each set- up? 2. according to abiogenesis, life may emerge from non- living materials. does the sealed flask setup follow this principle? explain.

16. JOHN NEEDHAM EXPERIMENT 1. what does the heating o high temperature do with the micro-organism in the broth? 2. if the organisms die due ti the heating, why does the third set-up has microbial growth? 3. does this experiment coincide with the abiogenesis?

17. LAZARO SPALLANZANI EXPERIMENT 1. how this experiment differ from needham? 2. does this experiment prove or disprove the abiogenesis idea of the emergence of life forms? Explain.

18. LOUIS PASTEUR EXPERIMENT 1. after the broth was heated, did microbial growth happen in the set-up wjth the long curved glass neck? 2. why do you think tere is no microbial growth with the set- up with long curved open glass neck? 3, what happens whrn the glass neck is cut? 4. how will you explain Pasteur’s in connection to the abiogenesis?

19. FRANCISCO REDDI’S EXPERIMENT redi was able to prove that orgsnisms do not just come to life spontaneously?

20. JOHN NEEDHAM EXPERIMENT he tried to prove that spontaneous generation occur in an appropriate condition. heat could kill organism even the smallest one. when the broth was boiled,all organisms in it had died from the heat. days later, he noticed that a thick solution had formed on thd broth.

21. LAZARO SPALLANZANI EXPERIMENT needham had not heated enough to kill all organisms in it. the setup tat was sealed remained free from microbial growth. he concluded that life occured from something that entered the unsealed flask and that is was the one responsible for life to grow

22. LOUIS PASTEUR EXPERIMENT spontaneous generation could not occur. Vital element form air was necessary for life to emerge. Sugar solution and yeast in flask with long neck. through heating, elimated the contaminants. No oganisms develop in the mixture. couldn’t reack the mixture.

23. CHARACTE-RISTICS OF LIVING THINGS 1. ARE MADE UP OF CELLS. 2. METABOLIZE ANABOLISM,CATABOLISM 3. GROW AND DEVELOP 4. RESPOND TO STIMULI 5. INTERACT 6. REPRODUCE 7. ADAPT AND EVOLVE 8. ORGANIZED STRUCTURE

24. BIOLOGICAL HIERARCHY LEVEL 1. ATOM 2. ORGANELLES 3. CELLS 4. TISSUES 5. ORGANS AND ORGAN SYSTEM 6. ORGANISMS 7. POPULATIONS 8. COMMUNITIES 9. ECOSYSTEMS 10. BIOSPHERE

25. BIOGEOCHEMICAL CYLCLE 1. CARBON CYCLE 2. PHOSPOROUS CYCLE 3. NITROGEN CYCLE 4. WATER CYCLE 5. OXYGEN CYCLE

26. THINK ABOUT THIS HUMAN ACTIVITIES TO CYCLE OF NUTRIENT

27. THANK YOU GOOD LUCK MARK O. AGUSTIN, LPT