Grade: 10th
calss
Time: 45 min.
Topic:
what is biology
WHAT IS BIOLOGY?
The
term biology in Greek word = " Bios, "life" and the suffix
-λογία, -logia, "study of." It means ~ the study of life~
Nowadays,
when you open a newspaper or watch a television programme, you can encounter
many interesting news about biology. We live together with biology, if you look
around carefully, you can see many things related with biology. For example:
the nice smelling rose, the girl who smells the rose, the cat that is running
to catch mouse etc. we can increase the examples.
One more
characteristic of life is the ability to adjust to surroundings, or the
environment. Anything in the environment—air, water, temperature, weather, other
organisms—that causes the organism to react is called a stimulus (plural,
stimuli). The organism’s
reaction to the stimulus is called a response. An organism also has the ability to
control its internal environment in order to maintain conditions suitable for
survival. For example, an organism must make
constant adjustments to maintain the right amount of water and minerals in its
cells. This ability is called homeostasis (internal balance). Without the ability to adjust to internal changes, an
organism would die.
If we
want to make the definition of biology, how can it be?
Biology is the science deal with the study
of life and living organisms; including their structure, function, growth,
origin, distribution, and taxonomy. As you know that, biologists have to know biology. But not
only biologists, also engineers and other scientists have to know biology. For what? For developing biology. Because
people take help for invention of machines. For example; birds showed the way of flying and
fishes showed the swimming underwater. Finally, people invented plane and
submarine. Today, engineers investigate structure of vertebrae(backbone) for
making more strong and usable bridges. It means your life is affected by
biology. So how can
you prepare yourself for this new world? The answer ; at first, Be
interested biology, then never stop studying, finally search unknown words and
learn them.
The Common Characteristics of Living
Things
If we
compare an elephant, ant and desk, we can see that the common properties
between elephant and ant more than desk. Because both elephant and ant have
LIFE but desk has not. Since there is no unequivocal definition of life. life
is a characteristic of organisms that exhibit all or most of phenomena.
However, according to which characteristics we can distinguish living and
nonliving things?
In nature, all living things have some common properties that share similar
characteristics. These are;
1-
Organization: Being structurally composed of one or more cells.
living things are made up of cells.
2-
Metabolism: Living things require energy to maintain internal
organization (homeostasis). On the other hand; Energy production is needed ;
Energy is produced by cellular respiration(breaking down of food
substances into their subunits to get energy= catabolism) (anabolism= to
construct/built molecules from smaller units. These reactions require energy)
3-
Homeostasis: keeping body in balance. Regulation of the internal
environment to maintain a constant state; for example, sweating to reduce
temperature or electrolyte concentration
4-
Growth and
development:
organisms increase in size,mass and number. Maintenance of a higher rate of
anabolism than catabolism. A growing organism increases in size in all of its
parts, rather than simply accumulating matter.
5-
Response to
stimuli: A response is often expressed by
motion, for example, the leaves of a plant turning toward the sun
(phototropism) and by chemotaxis.A response can take many forms, from the
contraction of a unicellular organism to external chemicals, to complex
reactions involving all the senses of multicellular organisms.
6-
Reproduction: The ability to produce new individual organisms,
either asexually from a single parent organism, or sexually from two parent
organisms.
7-
Movement: Living ability to change their place.
8-
Chemical
activities; Living things perform complex
chemical activities. for example; ingestion, digestion, respiration, excretion
How do
organisms respond to change? Organisms use energy to grow, develop, respond to stimuli,
and maintain homeostasis. Energy is the ability to cause change. Organisms get
their energy from food. Any behavior, structure, or internal process that
allows an organ-ism to make changes in response to environmental factors and
live long enough to reproduce is called an adaptation (a dap TAY shun).For
example, the leaves of many desert plants have a thick, waxy coating. This is
an adaptation that helps these plants conserve water. Having large eyes is an
adaptation that lets owls see well at night. The gradual change in a species
over time due to adaptations is called evolution
What do biologists do? Biologists make discoveries
and look for explanations by performing laboratory and fi eld studies. Some
biologists study animals in their natural environment. For example, Jane Goodall’s
observations helped scientists know how best to protect chimpanzees. Other
biologists research diseases to develop new medicines. Many biologists work to
develop new technology. Technology is the application of scientifi c knowledge
to solve human needs and to extend human capabilities. For example, Dr.
Charles Drew developed methods to separate blood plasma for transfusions. His
research led to blood banks. Some biologists study genetic engineering of
plants. They try to develop plants that can grow in poor soils and resist insects
and disease. Environmental biologists try to protect animals and plants from
extinction by developing ways to protect them.
How does development differ from growth? Growth
adds mass to an organism. Many organisms form new cells and new
structures as they grow. Development is the process of natural changes
that take place during the life of an organism. For example, after baby
birds hatch they cannot fly for a few weeks. As they grow, they develop
structures that give them the ability to fly.
The
Science of Biology answers
Biology
depend on behave relationship plants prevent
extinct Characteristics of Living Things answers
Non-living organisms DNA biologists single
cell offspring mate development single cell increase
adaptation
: any
structure,behavior, or internal process that enables an organism to respond to
environmental fac-tors and survive to produce offspring.
homeostasis: an organ-ism’s ability to control its internal envi-ronment
to maintain conditions suitable for survival
environment: the surroundings to which an organism must adjust; includes
air, water, weather, temperature, organisms, and other factors
Name:
Surname: Class: Date:
The Science of Biology
……………is the
study of life. When you study biology you will learn about all of the different
kinds of living things. You will learn where they live, what they are like, how
they ……………….each other, and how they ……….….. One of the main ideas in biology
is that living things depend on each other. They are part of what is called the
balance of nature. All living things interact with other living things and with
the world they live in. Without these……………, nothing would survive. Humans need
plants and animals to supply us with food and raw materials, such as wood, oil,
and cotton. …………….provide the oxygen in our air.
The study of one living thing always involves studying other living things.
Knowing how human life depends on nature and other living things is the only
way that humans can expect to understand how to keep Earth healthy. With this
knowledge, researchers can find ways to ………………diseases. Scientists can also find
ways to help save living things that are in danger of becoming ……………………and
solve other problems.
Behave
Extinct Relationship Plants Depend
on Prevent Biology
Characteristics of Living Things
Sometimes it
is difficult to tell the difference between living and nonliving things. At
times, …………………….. have one or more of the characteristics of life, but it is necessary
to have all of the characteristics of life to be considered living. Things that
have all of the characteristics of life are known as………………………. All organisms
are made of one or more cells. Each cell contains the genetic material ………….
that has the information needed to control the life processes of the organism.
One of the
first things ………………….. look for when they are searching for characteristics of
life is structure, or organization. Whether an organism is made of a ……………… or
billions of cells, all of its parts work together in an orderly living system. Another
important characteristic of life is reproduction. Reproduction is the ability
of an organism to make more of the same type of organism. The new organisms
that are made are called…………….. Although reproduction is not needed for the
survival of an individual organism, it must occur for the continuation of the organism’s
species. A species (SPEE sheez) consists of a group of organisms that can
…………… with each other and produce offspring that are able to reproduce. For
example, there are many species of crocodiles including the American crocodile,
the Australian fresh-water crocodile, and the saltwater crocodile. American
crocodiles reproduce only American crocodiles. Without reproduction, the
species would die out. Another characteristic of life is that growth and
…………………..must take place. An organism begins life as a …………... As time passes,
it grows and develops. As growth and development take place, the organism takes
on the characteristics of its species. Growth results in the formation of new
structures and an …………….. in the amount of living material. Development refers
to the changes that occur in each organism’s life.
DNA offspring
Non-living single cell organisms
development increase mate biologists
single cell
Answer
the following questions
1- How do
organisms respond to change?
2- Give two examples of ways in which humans depend on other living things?
3- Write a sentence for each of the following words: homeostasis
,adaptation, environment 4- What Do Biologists
Do?
5- How does development differ from growth?
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