In changed environmental condition, certain variations may be useful.If a species survived in a particular kind of environment, for e.g., in neutral pH and certain variation occured in some of its members of the population. Then under changed pH conditions, say more basic, the variation that reallyRead more
In changed environmental condition, certain variations may be useful.If a species survived in a particular kind of environment, for e.g., in neutral pH and certain variation occured in some of its members of the population. Then under changed pH conditions, say more basic, the variation that really did not matterin neutral pH, may help in survival of these variants.
DNA contains information for inheritance of features from parents to next generation. During reproduction, a parent cell may directly give rise to the daughter cell, or indirectly by formation of gametes. In either case, the new cell produced must contain information present in the parent cell to foRead more
DNA contains information for inheritance of features from parents to next generation. During reproduction, a parent cell may directly give rise to the daughter cell, or indirectly by formation of gametes. In either case, the new cell produced must contain information present in the parent cell to form its own proteins. Thus DNA copying is essential, so that the daughter cells may have their own sets of chromosomes, having same information, as that in the parent cell.
An organism has different organs which perform various functions. The survival of an organism depends on integrated and coordinated functions of these organs. Nervous and endocrine system of an organism make them work together like parts of one machine to accomplish homeostasis or coordination.
An organism has different organs which perform various functions. The survival of an organism depends on integrated and coordinated functions of these organs. Nervous and endocrine system of an organism make them work together like parts of one machine to accomplish homeostasis or coordination.
Chemical coordination in plants is brought about by plant hormones also knows as phyto-hormones. These hormones either promote growth or inhibit it. Five major types of plant hormones are auxin, gibberellin, cytokinin, abscisic acid and ethylene. Auxin, gibberellin and cytokinin are referred as growRead more
Chemical coordination in plants is brought about by plant hormones also knows as phyto-hormones. These hormones either promote growth or inhibit it. Five major types of plant hormones are auxin, gibberellin, cytokinin, abscisic acid and ethylene. Auxin, gibberellin and cytokinin are referred as growth promoters whereas abscisic acid and ethylene are growth inhibitors. certain physiological processes like seed germination and flowering respond to the daily duration of light hours or photoperiods. Plants respond to this photoperiodic stimulus by a specialised chemical called phytochrome.
Receptors are cells, tissues and organs which are capable of receiving particular stimuli and initiate impulses to be picked up by sensory nerves. these receptors are located in our sense organs such as the inner ear, nose, tongue, eye, skin etc. In case any of the receptors do not work properly weRead more
Receptors are cells, tissues and organs which are capable of receiving particular stimuli and initiate impulses to be picked up by sensory nerves. these receptors are located in our sense organs such as the inner ear, nose, tongue, eye, skin etc. In case any of the receptors do not work properly we will not be able to perceive that particular information. For example, if our gustatory receptors located in tongue do not work we will not perceive the taste of food such as sour, sweet, salty or bitter.
Why is variation beneficial to the species but not necessarily for the individual?
In changed environmental condition, certain variations may be useful.If a species survived in a particular kind of environment, for e.g., in neutral pH and certain variation occured in some of its members of the population. Then under changed pH conditions, say more basic, the variation that reallyRead more
In changed environmental condition, certain variations may be useful.If a species survived in a particular kind of environment, for e.g., in neutral pH and certain variation occured in some of its members of the population. Then under changed pH conditions, say more basic, the variation that really did not matterin neutral pH, may help in survival of these variants.
See lessWhat is the importance of DNA copying in reproduction?
DNA contains information for inheritance of features from parents to next generation. During reproduction, a parent cell may directly give rise to the daughter cell, or indirectly by formation of gametes. In either case, the new cell produced must contain information present in the parent cell to foRead more
DNA contains information for inheritance of features from parents to next generation. During reproduction, a parent cell may directly give rise to the daughter cell, or indirectly by formation of gametes. In either case, the new cell produced must contain information present in the parent cell to form its own proteins. Thus DNA copying is essential, so that the daughter cells may have their own sets of chromosomes, having same information, as that in the parent cell.
See lessWhat is the need for a system of control and coordination in an organism?
An organism has different organs which perform various functions. The survival of an organism depends on integrated and coordinated functions of these organs. Nervous and endocrine system of an organism make them work together like parts of one machine to accomplish homeostasis or coordination.
An organism has different organs which perform various functions. The survival of an organism depends on integrated and coordinated functions of these organs. Nervous and endocrine system of an organism make them work together like parts of one machine to accomplish homeostasis or coordination.
See lessHow does chemical coordination occur in plants?
Chemical coordination in plants is brought about by plant hormones also knows as phyto-hormones. These hormones either promote growth or inhibit it. Five major types of plant hormones are auxin, gibberellin, cytokinin, abscisic acid and ethylene. Auxin, gibberellin and cytokinin are referred as growRead more
Chemical coordination in plants is brought about by plant hormones also knows as phyto-hormones. These hormones either promote growth or inhibit it. Five major types of plant hormones are auxin, gibberellin, cytokinin, abscisic acid and ethylene. Auxin, gibberellin and cytokinin are referred as growth promoters whereas abscisic acid and ethylene are growth inhibitors. certain physiological processes like seed germination and flowering respond to the daily duration of light hours or photoperiods. Plants respond to this photoperiodic stimulus by a specialised chemical called phytochrome.
See lessWhat is the function of receptors in our body? Think of situations where receptors do not work properly. What problems are likely to arise?
Receptors are cells, tissues and organs which are capable of receiving particular stimuli and initiate impulses to be picked up by sensory nerves. these receptors are located in our sense organs such as the inner ear, nose, tongue, eye, skin etc. In case any of the receptors do not work properly weRead more
Receptors are cells, tissues and organs which are capable of receiving particular stimuli and initiate impulses to be picked up by sensory nerves. these receptors are located in our sense organs such as the inner ear, nose, tongue, eye, skin etc. In case any of the receptors do not work properly we will not be able to perceive that particular information. For example, if our gustatory receptors located in tongue do not work we will not perceive the taste of food such as sour, sweet, salty or bitter.
See less