Capacities of the sperm gain after capacitation involve__

a) CatSper calcium channels to sense calcium influx and monitor the direction of the current

b) recognizing the cues that will guide them to the egg

c) undergoing the acrosome reaction

d) fusing with the egg cell membrane

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#Question id: 26888

#Unit 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;

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#Question id: 26889

#Unit 10. Ecological Principles

Shifting cultivation is a form of agricultural practice in the hills of Northeast India, where a forest patch is cleared and cultivated for a few years, after which it is left fallow and allowed to regenerate. Succession occurs on such previously cultivated plots. Over time, the plant community should move towards which region in the graph?

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#Question id: 26890

#Unit 10. Ecological Principles

The MacArthur-Wilson equilibrium model of island biogeography predicts the number of species found on islands. The figure below depicts two volcanic islands located off a section of mainland coast.

 The MacArthur-Wilson model predicts that the relative numbers of bird species on the mainland and two islands would be

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#Question id: 26891

#Unit 10. Ecological Principles

 A researcher working on island biogeography mapped how isolation-controlled immigration (I), and area-controlled extinction (E), will act on number of species present on the islands. He forgot to label the size of the islands (small or large) and the location of the islands (near or far) on the graph.

Using information from MacArthur and Wilson's equilibrium theory, select the option that correctly identifies A, B, C and D in the figure above. 

TLS Online TPP Program

#Question id: 26892

#Unit 10. Ecological Principles

If a species has more genetic variation, it can adapt better

TLS Online TPP Program

#Question id: 26893

#Unit 10. Ecological Principles

Greater amphibian species diversity seen in