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Question
The given graph represents the organismic response to temperature. Identify i, ii and iii.
The given graph represents the organismic response to temperature. Identify i, ii and iii.
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Solution
The correct option is A i - conformers, ii - regulators, iii - partial regulators
Homeostasis can be defined as the ability of organisms to maintain a stable and a relatively constant internal environment.
Based on whether organisms can maintain a constant internal environment, they can be classified as conformers, regulators and partial regulators.
Conformers - Conformers are organisms that cannot maintain a constant internal environment.
For example, the body temperature of these organisms changes with the ambient temperature.
99% of animals and nearly all plants are conformers.
Regulators - Organisms such as mammals and birds that can very well exhibit homeostasis are called regulators. They are capable of osmoregulation (active regulation of body fluid osmolarity) and thermoregulation.
Thermoregulation is a mechanism by which regulators maintain a constant body temperature independent of external temperatures.
Partial regulators - There are some organisms which are intermediate between conformers and regulators. They are able to maintain homeostasis, but only over a limited range of environmental conditions, beyond which they simply conform.
In the graph given above, it can be seen that
in (i) - the internal condition is changing with respect to the external conditions. Thus, it represents conformers.
in (ii) - the internal conditions remain constant with changing external conditions. Thus, it represents regulators.
in (iii) - represents partial regulators which are able to maintain stable internal conditions but only over a limited range.
Homeostasis can be defined as the ability of organisms to maintain a stable and a relatively constant internal environment.
Based on whether organisms can maintain a constant internal environment, they can be classified as conformers, regulators and partial regulators.
Conformers - Conformers are organisms that cannot maintain a constant internal environment.
For example, the body temperature of these organisms changes with the ambient temperature.
99% of animals and nearly all plants are conformers.
Regulators - Organisms such as mammals and birds that can very well exhibit homeostasis are called regulators. They are capable of osmoregulation (active regulation of body fluid osmolarity) and thermoregulation.
Thermoregulation is a mechanism by which regulators maintain a constant body temperature independent of external temperatures.
Partial regulators - There are some organisms which are intermediate between conformers and regulators. They are able to maintain homeostasis, but only over a limited range of environmental conditions, beyond which they simply conform.
In the graph given above, it can be seen that
in (i) - the internal condition is changing with respect to the external conditions. Thus, it represents conformers.
in (ii) - the internal conditions remain constant with changing external conditions. Thus, it represents regulators.
in (iii) - represents partial regulators which are able to maintain stable internal conditions but only over a limited range.
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