Evolution cannot always be equated with progress or better body designs. Evolution simply creates more complex body designs. However, this does not mean that the simple body designs are inefficient. In fact, bacteria having a simple body design are still the most cosmopolitan organisms found on eartRead more
Evolution cannot always be equated with progress or better body designs. Evolution simply
creates more complex body designs. However, this does not mean that the simple body
designs are inefficient. In fact, bacteria having a simple body design are still the most
cosmopolitan organisms found on earth. They can survive hot springs, deep sea, and even
freezing environment.
Therefore, bacteria, spiders, fish, and chimpanzees are all different branches of evolution.
A species is a group of organisms that are capable of interbreeding to produce a fertile offspring. Skin colour, looks, and size are all variety of features present in human beings. These features are generally environmentally controlled. Various human races are formed based on these features. HowevRead more
A species is a group of organisms that are capable of interbreeding to produce a fertile
offspring. Skin colour, looks, and size are all variety of features present in human beings.
These features are generally environmentally controlled. Various human races are formed
based on these features. However, there is no biological basis to this concept of races.
Therefore, all human beings are a single species as humans of different colour, size, and
looks are capable of reproduction and can produce a fertile offspring.
Fossils are the remains of organisms that once existed on earth. They represent the ancestors of plants and animals that are alive today. They provide evidences of evolution by revealing the characteristics of the past organism and the changes that have occurred in these organisms to give rise to thRead more
Fossils are the remains of organisms that once existed on earth. They represent the
ancestors of plants and animals that are alive today. They provide evidences of evolution
by revealing the characteristics of the past organism and the changes that have occurred
in these organisms to give rise to the present organisms.
Wings of a butterfly are composed of membrane, while wings of a bat are composed of bony skeleton. Hence, these are not homologous organs rather analogous organs. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-9/
Wings of a butterfly are composed of membrane, while wings of a bat are composed of
bony skeleton.
Hence, these are not homologous organs rather analogous organs.
The presence of feathers in dinosaurs and birds indicates that they are evolutionarily related. Dinosaurs had feathers not for flying but instead these feathers provided insulation to these warm-blooded animals. However, the feathers in birds are used for flight. This proves that reptiles and birdsRead more
The presence of feathers in dinosaurs and birds indicates that they are evolutionarily
related. Dinosaurs had feathers not for flying but instead these feathers provided
insulation to these warm-blooded animals. However, the feathers in birds are used for
flight. This proves that reptiles and birds are closely related and that the evolution of wings
started in reptiles.
Geographical isolation prevents gene flow between populations of a species whereas asexual reproduction generally involves only one individual. In an asexually reproducing organism, variations can occur only when the copying of DNA is not accurate. Therefore, geographical isolation cannot prevent thRead more
Geographical isolation prevents gene flow between populations of a species whereas
asexual reproduction generally involves only one individual. In an asexually reproducing
organism, variations can occur only when the copying of DNA is not accurate. Therefore,
geographical isolation cannot prevent the formation of new species in an asexually
reproducing organism.
Geographical isolation can prevent the transfer of pollens among different plants. However, since the plants are self-pollinating, which means that the pollens are transferred from the anther of one flower to the stigma of the same flower or of another flower of the same plant, geographical isolatioRead more
Geographical isolation can prevent the transfer of pollens among different plants.
However, since the plants are self-pollinating, which means that the pollens are
transferred from the anther of one flower to the stigma of the same flower or of another
flower of the same plant, geographical isolation cannot prevent speciation in this case.
Natural selection, genetic drift and acquisition of traits during the life time of an individual can give rise to new species. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-9/
Natural selection, genetic drift and acquisition of traits during the life time of an individual
can give rise to new species.
Small numbers of tigers means that fewer variations in terms of genes are available. This means that when these tigers reproduce, there are less chances of producing progeny with some useful variations. Hence, it is a cause of worry from the point of view of genetics. For more answers visit to websiRead more
Small numbers of tigers means that fewer variations in terms of genes are available. This
means that when these tigers reproduce, there are less chances of producing progeny with
some useful variations. Hence, it is a cause of worry from the point of view of genetics.
This happens because an acquired trait involves change in non-reproductive tissues (somatic cells) which cannot be passed on to germ cells or the progeny. Therefore, these traits cannot be inherited. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-10/science/chRead more
This happens because an acquired trait involves change in non-reproductive tissues
(somatic cells) which cannot be passed on to germ cells or the progeny. Therefore, these
traits cannot be inherited.
In evolutionary terms, can we say which among bacteria, spiders, fish and chimpanzees have a ‘better’ body design? Why or why not?
Evolution cannot always be equated with progress or better body designs. Evolution simply creates more complex body designs. However, this does not mean that the simple body designs are inefficient. In fact, bacteria having a simple body design are still the most cosmopolitan organisms found on eartRead more
Evolution cannot always be equated with progress or better body designs. Evolution simply
creates more complex body designs. However, this does not mean that the simple body
designs are inefficient. In fact, bacteria having a simple body design are still the most
cosmopolitan organisms found on earth. They can survive hot springs, deep sea, and even
freezing environment.
Therefore, bacteria, spiders, fish, and chimpanzees are all different branches of evolution.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-9/
Why are human beings who look so different from each other in terms of size, colour and looks said to belong to the same species?
A species is a group of organisms that are capable of interbreeding to produce a fertile offspring. Skin colour, looks, and size are all variety of features present in human beings. These features are generally environmentally controlled. Various human races are formed based on these features. HowevRead more
A species is a group of organisms that are capable of interbreeding to produce a fertile
offspring. Skin colour, looks, and size are all variety of features present in human beings.
These features are generally environmentally controlled. Various human races are formed
based on these features. However, there is no biological basis to this concept of races.
Therefore, all human beings are a single species as humans of different colour, size, and
looks are capable of reproduction and can produce a fertile offspring.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-9/
What are fossils? What do they tell us about the process of evolution?
Fossils are the remains of organisms that once existed on earth. They represent the ancestors of plants and animals that are alive today. They provide evidences of evolution by revealing the characteristics of the past organism and the changes that have occurred in these organisms to give rise to thRead more
Fossils are the remains of organisms that once existed on earth. They represent the
ancestors of plants and animals that are alive today. They provide evidences of evolution
by revealing the characteristics of the past organism and the changes that have occurred
in these organisms to give rise to the present organisms.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-9/
Can the wing of a butterfly and the wing of a bat be considered homologous organs? Why or why not?
Wings of a butterfly are composed of membrane, while wings of a bat are composed of bony skeleton. Hence, these are not homologous organs rather analogous organs. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-9/
Wings of a butterfly are composed of membrane, while wings of a bat are composed of
bony skeleton.
Hence, these are not homologous organs rather analogous organs.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-9/
Give an example of characteristics being used to determine how close two species are in evolutionary terms.
The presence of feathers in dinosaurs and birds indicates that they are evolutionarily related. Dinosaurs had feathers not for flying but instead these feathers provided insulation to these warm-blooded animals. However, the feathers in birds are used for flight. This proves that reptiles and birdsRead more
The presence of feathers in dinosaurs and birds indicates that they are evolutionarily
related. Dinosaurs had feathers not for flying but instead these feathers provided
insulation to these warm-blooded animals. However, the feathers in birds are used for
flight. This proves that reptiles and birds are closely related and that the evolution of wings
started in reptiles.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-9/
Will geographical isolation be a major factor in the speciation of an organism that reproduces asexually? Why or why not?
Geographical isolation prevents gene flow between populations of a species whereas asexual reproduction generally involves only one individual. In an asexually reproducing organism, variations can occur only when the copying of DNA is not accurate. Therefore, geographical isolation cannot prevent thRead more
Geographical isolation prevents gene flow between populations of a species whereas
asexual reproduction generally involves only one individual. In an asexually reproducing
organism, variations can occur only when the copying of DNA is not accurate. Therefore,
geographical isolation cannot prevent the formation of new species in an asexually
reproducing organism.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-9/
Will geographical isolation be a major factor in the speciation of a self-pollinating plant species? Why or why not?
Geographical isolation can prevent the transfer of pollens among different plants. However, since the plants are self-pollinating, which means that the pollens are transferred from the anther of one flower to the stigma of the same flower or of another flower of the same plant, geographical isolatioRead more
Geographical isolation can prevent the transfer of pollens among different plants.
However, since the plants are self-pollinating, which means that the pollens are
transferred from the anther of one flower to the stigma of the same flower or of another
flower of the same plant, geographical isolation cannot prevent speciation in this case.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-9/
What factors could lead to the rise of a new species?
Natural selection, genetic drift and acquisition of traits during the life time of an individual can give rise to new species. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-9/
Natural selection, genetic drift and acquisition of traits during the life time of an individual
can give rise to new species.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-9/
Why are the small numbers of surviving tigers a cause of worry from the point of view of genetics?
Small numbers of tigers means that fewer variations in terms of genes are available. This means that when these tigers reproduce, there are less chances of producing progeny with some useful variations. Hence, it is a cause of worry from the point of view of genetics. For more answers visit to websiRead more
Small numbers of tigers means that fewer variations in terms of genes are available. This
means that when these tigers reproduce, there are less chances of producing progeny with
some useful variations. Hence, it is a cause of worry from the point of view of genetics.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-9/
Why are traits acquired during the life-time of an individual not inherited?
This happens because an acquired trait involves change in non-reproductive tissues (somatic cells) which cannot be passed on to germ cells or the progeny. Therefore, these traits cannot be inherited. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-10/science/chRead more
This happens because an acquired trait involves change in non-reproductive tissues
(somatic cells) which cannot be passed on to germ cells or the progeny. Therefore, these
traits cannot be inherited.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-9/