Concept of life

1. Life Science
Q2W1: Introduction to….

2. Explain the evolving concept
of life based on emerging
pieces of evidence.
Specific Objectives:
• Identify the sequence of events of the history of life on
earth;
• Name the pieces of evidence on the evolution of life on
earth;
• Recognize the importance of knowing the history of life
on earth.
Learning Competency

3. Map of Conceptual Change
Statement Yes No
1. Life Science focuses in the study of living plants and animals.
2. Spontaneous Generation is a belief that life arises from non
living thing component of the earth.
3. Sensitivity is the ability of the living organism to react or
respond in a certain stimuli.
4. Autotrophic organisms existed before heterotrophic organism.
5. Eukaryotic cells learned the process of reproduction through
cell division in which modern plant and animal emerged.

4. It’s
Mentimeter
time!

5. • Study of life (Biology).
• A collection of disciplines that
is made up of theories and
principles that tackles the
structure and function of
living things starting from
molecular level to entire
ecosystem.
Life Science

6. Study of plants Study of animals Study of microorganisms
Branches of Life Science
Botany Zoology Microbiology

7. • Study of life (Biology).
• A collection of disciplines that
is made up of theories and
principles that tackles the
structure and function of
living things starting form
molecular level to entire
ecosystem.
Life Science

8. Fact – a piece of information about
circumstances that exist or events that
have occurred.
Hypothesis – an idea or explanation for
something that is based on known facts
but has not yet been proved.
Theory – a set of statements or principles
devised to explain a group of facts or
phenomena, especially one that has been
repeatedly tested.
Law – universally accepted set of
statements to explain a body of
observations in the form of a verbal or
mathematical statements that has been
proven and tested.

9. Theories about the Origin of Life
Special
Creation
Extraterrestrial
Origin
Spontaneous
Origin
Life forms may have
been put on earth by
supernatural or
divine forces.
Life may not have originated
on earth at all; instead, life may
have infected earth from some
other planet
Life may have evolved from
inanimate matter, as
associations among molecules
became more and more
complex.

10. Alexander Oparin and John Haldane
• Hypothesized that spontaneous formation of organic
molecules produced a “primordial soup” which later
gave rise to living organisms. (1920)
• Explains origin of life via transformation of
hydrocarbons to biomolecules.

11. Stanley Miller and Harold Urey
• Conducted an experiment to prove Oparin-Haldane
hypothesis which provided foundational piece of
evidence that origin of life forms arose spontaneously
through chemical reactions. (1953)
• Proved that organic molecules can be formed from
inorganic components.

12. Evidences of Earliest Life forms
1. Trilobites fossils are believed
to be extinct marine
arthropods found on dry lands.
2. Stromatolites are the layered
trace fossils of microbial life,
primarily cyanobacteria, found
on rocks.
Fossils and Microfossils

13. Trilobites

14. Stromatolites

15. CREDITS: This presentation
template was created by Slidesgo,
including icons by Flaticon, and
infographics & images by Freepik
How can we
say if a thing
has life?

16. 1. All organisms use ENERGY.
A series of processes that
control how organism
creates and uses energy.

17. 2. All organisms maintain a stable internal environment
(HOMEOSTASIS).
Homeostasis refers to the
body's need to reach and
maintain a certain state of
equilibrium.

18. 3. All organisms DETECT and RESPOND to select external
STIMULI. (SENSITIVITY)

19. 4. All organisms can engage in MOVEMENT (which
may occur internally, or even at the cellular level).

20. 5. All organisms show GROWTH and DEVELOPMENT;
that is, specialization of cells or structures. (Even
unicellular organisms show a tiny amount of growth,
and single cells repair and use materials from the
environment to replace internal structures as needed.)

21. 6. All organisms REPRODUCE. (Even if an individual
can’t reproduce, its species can.) In addition, an
individual’s cells are constantly reproducing
themselves.
Asexual Reproduction

22. 7. All organisms have NUCLEIC ACID as the hereditary
molecule. (HEREDITY AND VARIATION)

23. 8. All organisms show ADAPTATION, which occurs at
the individual level and is tightly related to homeostasis.
A change or the process
of change by which an
organism or species
becomes better suited to
its environment:
ADAPTATION

24. 9. All organisms are made of one or more CELLS.

25. 10. All organisms exhibit COMPLEX ORGANIZATION,
grouping molecules together to form cells; at a higher
level, cells are organized into tissues, organs, and
organ systems.

26. 11. All organisms exhibit EVOLUTION over
time due to mutation and natural selection
(which operates at the species level).

27. Energy
Homeostasis
Sensitivity
Movement
Reproduction
Heredity and Variation
Characteristics of Life
Adaptation
Cells
Complex Organization
Growth and Development
Evolution

28. Activity
Time!!!

29. Statement / Scenario Characteristic of Life
Janine married Frank after dating for four years. After 2 months, Janine thought she
just had difficulty having menstruation then she found out she was pregnant.
You throw a piece of seed into your backyard. After a few weeks, there was a
seedling started to grow.
Stomata are small openings present on plant leaves. On a hot dry day, the stomatal
openings remain closed to reduce the loss of water. Which characteristic of living
things is described here?
Puppies have inherited genes from both parents and share many of the same
characteristics.
eggs—tadpoles—adult frogs
Snakes shed their skin.
Mary was running fast because she was late in her Biology class. When she entered
the classroom, she was sweating a lot.
Pollen carried from flower to flower
A triathlon player ate plenty of fruits and vegetable as a preparation for his
competition next week.
Guttation in plants gradually happen.

30. Statement / Scenario Characteristic of Life
Janine married Frank after dating for four years. After 2 months, Janine thought she
just had difficulty having menstruation then she found out she was pregnant.
You throw a piece of seed into your backyard. After a few weeks, there was a
seedling started to grow.
Stomata are small openings present on plant leaves. On a hot dry day, the stomata
openings remain closed to reduce the loss of water. Which characteristic of living
things is described here?
Puppies have inherited genes from both parents and share many of the same
characteristics.
eggs—tadpoles—adult frogs
Snakes shed their skin.
Mary was running fast because she was late in her Biology class. When she entered
the classroom, she was sweating a lot.
Pollen carried from flower to flower
A triathlon player ate plenty of fruits and vegetable as a preparation for his
competition next week.
Guttation in plants gradually happen.

31. CREDITS: This presentation
template was created by Slidesgo,
including icons by Flaticon, and
infographics & images by Freepik
Short
Review
Quiz
Prepare ¼ sheet of paper
Write your name, section and date
Write numbers 1 to 15

32. 1 – 3. What are the 3 main
disciplines of Life Science?
4 – 6. What are the 3 Theories
about the origin of life?
7 – 15. Give at least 9 of the 11
Characteristics of life.

33. 1 – 3. Botany
Zoology
Microbiology
4 – 6. Special Creation
Extraterrestrial Origin
Spontaneous Origin
7 – 15. Energy Adaptation
Cells Complex Organization
Evolution Growth and Development
Homeostasis Movement
Sensitivity Heredity and Variation
Reproduction
A
n
s
w
e
r
s

34. Activity
Time!!!

36. Period
BYA
Evolution Description

37. Period
BYA
Evolution Description
Before 3.8 Organic Molecules Organic molecules formed from the simple inorganic chemical
3.8-3.5 Membranes Organic molecules floating in the sea waters clustered to form
more complex molecules
3.8-3.5 Prokaryotic:
Heterotrophic Cells
Heterotrophic use chemicals from outside sources for energy and
to create their molecules.
3.5-1.5 Prokaryotic:
Autotrophic Cells
Any cell that could produce their own organic molecules from
simple sources using energy in the environment were more likely
to survive.
2.0-1.0 Eukaryotic Cells Prokaryotic cells were engulfed by larger cells and become
organelles that leads to the formation of membrane-bound
organelles
1.5 Colonial Organisms Organisms learned to live in groups or colonies which are
interdependence to each other.
1.5-0.5 Multicellular
Organisms
Eukaryotic cells learned the process of reproduction through cell
division in which modern plant and animal emerged.