Following statements are regarding to the heat production by the activation of sympathetic nervous system.

A. Activation is stimulation of β receptors in brown fat, which increases metabolic rate and heat production.

B. Activation is stimulation of α2 receptors in brown fat, which increases metabolic rate and heat production.

C. Stimulation of α1 receptors in vascular smooth muscle of skin blood vessels, producing vasoconstriction. Vasoconstriction reduces blood flow to the surface of the skin.

D. Stimulation of α1 receptors in vascular smooth muscle of skin blood vessels, producing vasodilation. Vasodilation reduces blood flow to the surface of the skin.

Which of the following combination is correct?

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#Question id: 11912

#10. Ecological Principles

The success of birds introduced to Tahiti or the Hawaiian Islands was dependent on the morphology of the species already present. If there was a small morphological difference in bill length between the resident and introduced species, then

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#Question id: 11913

#10. Ecological Principles

During the rate of succession several factors would be observe at the pioneer as well as climax community;

STAGES	CHARACTER
A) Pioneer community	i) Biotic Potential low
B) Climax community	ii) Root to Shoot ratio is high
	iii) Productivity per biomass is low
	iv) Net primary productivity is high
	v) P/R ratio is greater than 1
	vi) Nutrient cycling is closed
	vii) Regeneration ability is more
	viii) Resistance ability is more

Match the community stages with its given characters;

TLS Online TPP Program

#Question id: 11914

#10. Ecological Principles

Alder trees, which harbour nitrogen-fixing bacteria in their roots, provide nitrogen to soils developing on sandbars rivers, this is an example of,

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#Question id: 11915

#10. Ecological Principles

Which of the following is the correct prediction about the three types of model such as; Facilitation, Inhibition, Tolerance model.

TLS Online TPP Program

#Question id: 11916

#10. Ecological Principles

Which one of the following  features of an later community?

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#Question id: 11917

#10. Ecological Principles

Which one of the following  features of an early community?