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Properties of cell organelles are not always found in the molecular constituents of cell organelles. Justify.
The organisation in a living body produces a new functional entity, which has its own properties not found in its components. Hence, a cell organelle is the one having its own properties not found in its molecular constituents.
The organisation in a living body produces a new
See lessfunctional entity, which has its own properties not
found in its components. Hence, a cell organelle is
the one having its own properties not found in its
molecular constituents.
Which organisms can sense and respond to their environment? How do humans sense their environment?
All organisms from the prokaryotes to the most complex eukaryotes can sense and respond to their environment. The humans have five sense organs, which help them to sense their environment. These are eyes, ears, nose, tongue and skin.
All organisms from the prokaryotes to the most
See lesscomplex eukaryotes can sense and respond to their
environment.
The humans have five sense organs, which help them
to sense their environment. These are eyes, ears,
nose, tongue and skin.
A ball of snow when rolled over snow increases in mass, volume and size. Is this comparable to growth as seen in living organisms? Why?
No, this is not growth, as increase in size of ball of snow is just because of the addition of similar material externally. In living organisms, growth is due to increase in body material from inside.
No, this is not growth, as increase in size of ball of
See lesssnow is just because of the addition of similar
material externally.
In living organisms, growth is due to increase in
body material from inside.
Non-living things also grow. Explain the statement with example.
Non-living things also show growth, e.g., a mountain or sand dune grows by accumulating material externally on surface. But, this growth is considered as external growth in comparison to the growth of living things which is internal.
Non-living things also show growth, e.g., a mountain or
See lesssand dune grows by accumulating material externally on
surface. But, this growth is considered as external growth
in comparison to the growth of living things which is
internal.
List out the features which distinguish living things from non-living things.
The living things possess following features, which are not present in non-living things (i) growth and metabolism (ii) reproduction (iii) ability to sense stimuli (consciousness) (iv) ability to self-replicate and self-organise
The living things possess following features, which are not
See lesspresent in non-living things
(i) growth and metabolism
(ii) reproduction
(iii) ability to sense stimuli (consciousness)
(iv) ability to self-replicate and self-organise
How will you differentiate between growth of plants and animals?
In plants, growth continues throughout the life as they have meristematic regions, where the cell division occurs continuously. In animals, growth occurs only upto a certain age, after which cells divide only to replace worn out and lost cells.
In plants, growth continues throughout the life as they have
See lessmeristematic regions, where the cell division occurs
continuously. In animals, growth occurs only upto a certain
age, after which cells divide only to replace worn out and
lost cells.
Can we relate metabolism with growth of the body?
Yes, metabolism occurs due to two phenomena, i.e., anabolism and catabolism. The growth of living things occurs when quantity of anabolic reactions exceeds quantity of catabolic reactions.
Yes, metabolism occurs due to two phenomena, i.e.,
See lessanabolism and catabolism. The growth of living things
occurs when quantity of anabolic reactions exceeds
quantity of catabolic reactions.
All living organisms are linked with a common genetic material. What is this material?
All living organisms contain genetic material in the form of DNA which is responsible for the transmission of traits from one generation to the next. However, in some viruses another nucleic acid, i.e., RNA is present as the gefietic material.
All living organisms contain genetic material in the form of
See lessDNA which is responsible for the transmission of traits
from one generation to the next. However, in some viruses
another nucleic acid, i.e., RNA is present as the gefietic
material.
What is the advantage of consciousness in living organisms?
Consciousness enables an organism to respond to various external factors. It is the ability of living organisms to respond to various physical, chemical and biological stimuli from their surroundings.
Consciousness enables an organism to respond to various
See lessexternal factors. It is the ability of living organisms to
respond to various physical, chemical and biological stimuli
from their surroundings.
Define metabolism.
The sum total of all chemical reactions occurring in an organism due to specific interactions amongst different types of molecules within the cells, is called metabolism.
The sum total of all chemical reactions occurring in an
See lessorganism due to specific interactions amongst different
types of molecules within the cells, is called
metabolism.