Depending on the nature of variations different individuals would have different kinds of advantage e.g., Bacteria variants which can tolerate heat have a better survival chances in heat wave in comparison to non-variant bacteria having no capacity to tolerate heat wave.
Depending on the nature of variations different individuals would have different kinds of advantage e.g., Bacteria variants which can tolerate heat have a better survival chances in heat wave in comparison to non-variant bacteria having no capacity to tolerate heat wave.
Contraceptive methods should be adopted as: . They help in spacing two children. . Thus helps in maintaining a woman's and child's health. . Better care and healthier society. . Also prevention of sexually transmitted diseases on using condoms. . More productivity and hence better economic status.
Contraceptive methods should be adopted as:
. They help in spacing two children.
. Thus helps in maintaining a woman’s and child’s health.
. Better care and healthier society.
. Also prevention of sexually transmitted diseases on using condoms.
. More productivity and hence better economic status.
Reproduction results in production of more organisms of a type. This helps in perpetuation of species. Since there is copying of DNA involved, which may result in variation. Thus, reproduction provides stability as variation helps in better adaptability of a species.
Reproduction results in production of more organisms of a type. This helps in perpetuation of species. Since there is copying of DNA involved, which may result in variation. Thus, reproduction provides stability as variation helps in better adaptability of a species.
Since we are mammals, the development of growing foetus takes place inside the mother's womb. Thus, during each cycle, the uterus prepares itself for implantation by increasing blood flow and thickening of uterine walls. In case, fertilisation does not take place, the thickened wall is not required,Read more
Since we are mammals, the development of growing foetus takes place inside the mother’s womb. Thus, during each cycle, the uterus prepares itself for implantation by increasing blood flow and thickening of uterine walls. In case, fertilisation does not take place, the thickened wall is not required, it thus is shed along with blood and mucus in the form of menstrual flow.
The embryo gets nutrition from the mother's blood with the help of a special tissue called placenta. This is a disc which is embedded in the wall of the uterus. It contains finger-like projections villi on the embryo's side of the tissue. On the mother's sides are blood spaces, which surround the viRead more
The embryo gets nutrition from the mother’s blood with the help of a special tissue called placenta. This is a disc which is embedded in the wall of the uterus. It contains finger-like projections villi on the embryo’s side of the tissue. On the mother’s sides are blood spaces, which surround the villi. This provides a large surface area for glucose and oxygen to pass from the mother to the embryo and waste products from embryo to mother.
. Secretions of seminal vesicles and prostate gland provide fluid medium for sperms to swim. . Provides nutrition for them. . provides right pH for their survival.
. Secretions of seminal vesicles and prostate gland provide fluid medium for sperms to swim.
. Provides nutrition for them.
. provides right pH for their survival.
(i) Plant raised by vegetative propagation can bear flower and fruits earlier than those produced from seeds. (ii) It also helps in propagation of plants such as banana, orange, rose and jasmine that have lost the capacity to produce seeds. (iii) All plants produced by this method are genetically siRead more
(i) Plant raised by vegetative propagation can bear flower and fruits earlier than those produced from seeds.
(ii) It also helps in propagation of plants such as banana, orange, rose and jasmine that have lost the capacity to produce seeds.
(iii) All plants produced by this method are genetically similar to the parent plant to have its all characteristics.
(iv) Thus, desirable features of parent plant can be retained and expressed without any change future generations.
Complex organism have division of labour in their body, to avoid duplication of efforts. Thus they have specialised organs to perform specific functions. Through regeneration, it will not always be possible to differentiate in all types of cells. Thus, more complex organisms use more complex ways ofRead more
Complex organism have division of labour in their body, to avoid duplication of efforts. Thus they have specialised organs to perform specific functions. Through regeneration, it will not always be possible to differentiate in all types of cells. Thus, more complex organisms use more complex ways of reproduction.
The spores are covered by thick walls that protect them until they come into contact with suitable moist surface and can begin to grow. Thus spores help in survival of an organism during unfavourable conditions, until the return of suitable conditions.
The spores are covered by thick walls that protect them until they come into contact with suitable moist surface and can begin to grow. Thus spores help in survival of an organism during unfavourable conditions, until the return of suitable conditions.
How does the creation of variations in a species promote survival?
Depending on the nature of variations different individuals would have different kinds of advantage e.g., Bacteria variants which can tolerate heat have a better survival chances in heat wave in comparison to non-variant bacteria having no capacity to tolerate heat wave.
Depending on the nature of variations different individuals would have different kinds of advantage e.g., Bacteria variants which can tolerate heat have a better survival chances in heat wave in comparison to non-variant bacteria having no capacity to tolerate heat wave.
See lessWhat could be the reasons for adopting contraceptive methods?
Contraceptive methods should be adopted as: . They help in spacing two children. . Thus helps in maintaining a woman's and child's health. . Better care and healthier society. . Also prevention of sexually transmitted diseases on using condoms. . More productivity and hence better economic status.
Contraceptive methods should be adopted as:
See less. They help in spacing two children.
. Thus helps in maintaining a woman’s and child’s health.
. Better care and healthier society.
. Also prevention of sexually transmitted diseases on using condoms.
. More productivity and hence better economic status.
How does reproduction help in providing stability to populations of species?
Reproduction results in production of more organisms of a type. This helps in perpetuation of species. Since there is copying of DNA involved, which may result in variation. Thus, reproduction provides stability as variation helps in better adaptability of a species.
Reproduction results in production of more organisms of a type. This helps in perpetuation of species. Since there is copying of DNA involved, which may result in variation. Thus, reproduction provides stability as variation helps in better adaptability of a species.
See lessWhy does menstruation occur?
Since we are mammals, the development of growing foetus takes place inside the mother's womb. Thus, during each cycle, the uterus prepares itself for implantation by increasing blood flow and thickening of uterine walls. In case, fertilisation does not take place, the thickened wall is not required,Read more
Since we are mammals, the development of growing foetus takes place inside the mother’s womb. Thus, during each cycle, the uterus prepares itself for implantation by increasing blood flow and thickening of uterine walls. In case, fertilisation does not take place, the thickened wall is not required, it thus is shed along with blood and mucus in the form of menstrual flow.
See lessWhat are the functions performed by the testis in human beings?
In human beings, testis performs dual function: (i) Production of sperms. (ii) Secretion of male hormone testosterone.
In human beings, testis performs dual function:
See less(i) Production of sperms.
(ii) Secretion of male hormone testosterone.
How does the embryo get nourishment inside the mother’s body?
The embryo gets nutrition from the mother's blood with the help of a special tissue called placenta. This is a disc which is embedded in the wall of the uterus. It contains finger-like projections villi on the embryo's side of the tissue. On the mother's sides are blood spaces, which surround the viRead more
The embryo gets nutrition from the mother’s blood with the help of a special tissue called placenta. This is a disc which is embedded in the wall of the uterus. It contains finger-like projections villi on the embryo’s side of the tissue. On the mother’s sides are blood spaces, which surround the villi. This provides a large surface area for glucose and oxygen to pass from the mother to the embryo and waste products from embryo to mother.
See lessWhat is the role of the seminal vesicles and the prostate gland?
. Secretions of seminal vesicles and prostate gland provide fluid medium for sperms to swim. . Provides nutrition for them. . provides right pH for their survival.
. Secretions of seminal vesicles and prostate gland provide fluid medium for sperms to swim.
See less. Provides nutrition for them.
. provides right pH for their survival.
Why is vegetative propagation practiced for growing some types of plants?
(i) Plant raised by vegetative propagation can bear flower and fruits earlier than those produced from seeds. (ii) It also helps in propagation of plants such as banana, orange, rose and jasmine that have lost the capacity to produce seeds. (iii) All plants produced by this method are genetically siRead more
(i) Plant raised by vegetative propagation can bear flower and fruits earlier than those produced from seeds.
See less(ii) It also helps in propagation of plants such as banana, orange, rose and jasmine that have lost the capacity to produce seeds.
(iii) All plants produced by this method are genetically similar to the parent plant to have its all characteristics.
(iv) Thus, desirable features of parent plant can be retained and expressed without any change future generations.
Can you think of reasons why more complex organisms cannot give rise to new individuals through regeneration?
Complex organism have division of labour in their body, to avoid duplication of efforts. Thus they have specialised organs to perform specific functions. Through regeneration, it will not always be possible to differentiate in all types of cells. Thus, more complex organisms use more complex ways ofRead more
Complex organism have division of labour in their body, to avoid duplication of efforts. Thus they have specialised organs to perform specific functions. Through regeneration, it will not always be possible to differentiate in all types of cells. Thus, more complex organisms use more complex ways of reproduction.
See lessHow will an organism be benefited if it reproduces through spores?
The spores are covered by thick walls that protect them until they come into contact with suitable moist surface and can begin to grow. Thus spores help in survival of an organism during unfavourable conditions, until the return of suitable conditions.
The spores are covered by thick walls that protect them until they come into contact with suitable moist surface and can begin to grow. Thus spores help in survival of an organism during unfavourable conditions, until the return of suitable conditions.
See less