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What is meant by living? Give any four defining features of life forms.
An organism is said to be living, if it shows certain characteristic features that make it different from non-living things. The following properties are defining features ofa living organisms (i) Growth All liV,ng organisms show growth either by multiplication or by increase in size. Growth in liviRead more
An organism is said to be living, if it shows certain
See lesscharacteristic features that make it different from
non-living things.
The following properties are defining features ofa living
organisms
(i) Growth All liV,ng organisms show growth either by
multiplication or by increase in size. Growth in living things is
internal.
(ii) Reproduction All living things produce offsprings.
possessing features similar to their parents. Thus.
reproduction is essential to maintain the continuity of life on
earth.
(iii) Metabolism It is the sum total of reactions occurring inside
the body by which living things assimilate energy and use it
for growth.
(iv) Cellular Organisation The cells are the structural and
functional unit of every living organism.
Do you consider a person in coma, living or dead?
A person lying in coma is not conscious of its surrounding environment. Thus, he/she is not capable of responding to the external environmental stimuli. The person is supported by machines for various functions of the body. The person is otherwise brain dead. Some of these patients never come back tRead more
A person lying in coma is not conscious of its
See lesssurrounding environment. Thus, he/she is not capable of
responding to the external environmental stimuli. The
person is supported by machines for various functions
of the body. The person is otherwise brain dead. Some of
these patients never come back to normal life. They can
neither be called living nor non-living or dead.
Why reproduction is necessary? Is it essential for survival? If a living organism does not reproduce, in which category it will belong, living or non-living? How is sexual reproduction different from asexual reproduction?
Reproduction is required for the perpetuation of population. It is not necessary for the survival of living organisms. Many organisms, e.g., mules, sterile worker bees, infertile human couples are not able to reproduce, while they have all other defining properties of life, so they can be called asRead more
Reproduction is required for the perpetuation of
See lesspopulation. It is not necessary for the survival of living
organisms. Many organisms, e.g., mules, sterile worker
bees, infertile human couples are not able to reproduce,
while they have all other defining properties of life, so
they can be called as living.
Sexual reproduction involves the formation and fusion
of two kinds of gametes to produce an offspring. In
asexual reproduction, new individuals can arise by the
specialised parts of body or without the fusion of gametes.
Amoeba is a living matter and a sand particle is non-living matter. Explain.
Amoeba shows various characteristics such as growth' reproduction, metabolism, etc., that are specific to living organisms. On the other hand, a sand particle does not show any reproduction and metabolism therefore, it is considered as non-living matter. Though, the sand particle shows growth whichRead more
Amoeba shows various characteristics such as growth’
See lessreproduction, metabolism, etc., that are specific to living
organisms. On the other hand, a sand particle does not
show any reproduction and metabolism therefore, it is
considered as non-living matter. Though, the sand
particle shows growth which is also a characteristic of
living things, but in this the growth is only external due
to aggregation of many sand particles and not internal.
Therefore, Amoeba is a living matter while a sand
particle is a non-living matter.
Metabolism is a defining feature of all living organisms without exception. Isolated metabolic reactions in vitro are not living things, but surely living reactions. Comment.
The living organisms are made up of molecules. These are of various sizes, classes, functions, etc. They need to change in some other biomolecules. These conversions are chemical reactions or metabolic reactions. Metabolism is a defining feature of life, as living things depend on various biochemicaRead more
The living organisms are made up of molecules. These
See lessare of various sizes, classes, functions, etc. They need to
change in some other biomolecules. These conversions
are chemical reactions or metabolic reactions.
Metabolism is a defining feature of life, as living things
depend on various biochemical reactions. These
reactions can be demonstrated outside the body in
cell-free systems, which are neither living nor
non-living. Isolated metabolic reactions in vitro are thus,
not living things, but surely living reactions.
Metabolic reactions can be shown outside the body in cell-free systems experimentally. Why are cells required in living organisms?
Metabolic reactions can be demonstrated outside the body in cell-free systems. When an isolated metabolic reaction is performed outside the body of an organism in a test tube, it is neither living nor non-living. Hence, while metabolism is a defining feature of all living organisms without exceptionRead more
Metabolic reactions can be demonstrated outside the
See lessbody in cell-free systems. When an isolated metabolic
reaction is performed outside the body of an organism
in a test tube, it is neither living nor non-living. Hence,
while metabolism is a defining feature of all living
organisms without exception. isolated metabolic
reactions in vitro are not living things, but are living
reactions. Here. it can also be said that cellular
organisation of the body is the defining feature of life
forms.
What is the benefit of metabolism for living organisms? What are its types?
All the activities like growth, reproduction, movements, responsiveness, development, etc., are due to metabolism. Metabolism is of two types, i.e., anabolism and catabolism. Anabolism involves the synthesis of complex compounds from simpler ones, e.g.. photosynthesis and catabolism involves the breRead more
All the activities like growth, reproduction, movements,
See lessresponsiveness, development, etc., are due to
metabolism.
Metabolism is of two types, i.e., anabolism and
catabolism. Anabolism involves the synthesis of
complex compounds from simpler ones, e.g..
photosynthesis and catabolism involves the breakdown
of complex compounds into simpler substances, e.g.,
respiration.
What is biology and as a student of biology how will you define life?
Biology is the study of story of life on the earth. It is the story of evolution of living organisms on earth. As a student of biology. life can be explained as a unique, complex organisation of molecules expressing itself through chemical reactions, which lead to growth, development, responsivenessRead more
Biology is the study of story of life on the earth. It is the
See lessstory of evolution of living organisms on earth. As a
student of biology. life can be explained as a unique,
complex organisation of molecules expressing itself
through chemical reactions, which lead to growth,
development, responsiveness, adaptation and
reproduction.
Reproduction cannot be the defining characteristic of living organisms. Justify.
There are many organisms, which never reproduce in their life, although all other characteristic of living things are present in them, e.g., sterile worker bees, mules, infertile human couples, etc., Hence, reproduction cannot be an all-inclusive defining property of living things.
There are many organisms, which never reproduce
See lessin their life, although all other characteristic of living
things are present in them, e.g., sterile worker bees,
mules, infertile human couples, etc., Hence,
reproduction cannot be an all-inclusive defining
property of living things.
The number and kinds of organisms are constant . How do you explain this statement?
The number and kinds of organisms are never constant at a place, as development and keep the number changing. This is influenced by season and availability of resources, e.g., number of mosquitoes is very large in warm and humid weather, whereas in extreme summer or winter, they can be seen rarely.
The number and kinds of organisms are never
See lessconstant at a place, as development and
keep the number changing. This is influenced by
season and availability of resources, e.g., number of
mosquitoes is very large in warm and humid
weather, whereas in extreme summer or winter, they
can be seen rarely.