Which one of the following is not used for construction of ecological pyramids?

  • Dry weight

  • Number of individuals

  • Rate of energy flow

  • Rate of energy flow


D.

Rate of energy flow

Ecological pyramids are the graphical representation of the trophic structure and function at successive trophic levels. Ecological pyramids are of three general types, listed as here under:
(i) Pyramid of numbers, showing the number of organisms at each level.
(ii) Pyramid of biomass, showing the total dry weight of living matter.
(iii) Pyramid of energy, showing the rate of energy flow/productivity at successive trophic levels.
Thus, fresh weight is not used for the construction of ecological pyramids.

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Treatment of seed at low temperature under moist conditions to break its dormancy is called

  • scarification

  • vernalization

  • chelation

  • chelation


D.

chelation

Stratification involves the treatment of seed at low temperature  under sufficiently moist conditions to break its dormancy and to induce germination.
Scarification involves any damage or breakage of seed coat by physical methods (e.g., Use of scalpel, wooden hammer etc.) or chemical methods (use of mild acids) to break seed dormoney.
Vernalization and Chelation is the chill treatment of plant in its early stages of life history to stimulate or induce early flowering. 

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Presence of plants arranged into well defined vertical layers depending on their height can be seen best in :

  • Tropical Savannah

  • Tropical Rain Forest

  • Grassland

  • Grassland


B.

Tropical Rain Forest

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Which ecosystem has the maximum biomass?

  • Forest ecosystem

  • Grassland ecosystem

  • Pond ecosystem

  • Pond ecosystem


A.

Forest ecosystem

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Match the items given in Column I with those in Column II and select the correct option given below :

Column I Column II
a Eutrophication i UV-B radiation
b Sanitary landfill ii Deforestation
c Snow blindness iii Nutrient enrichment
d Jhum cultivation iv Waste disposal

  • a b c d
    ii i iii iv
  • a b c d
    i iii iv ii
  • a b c d
    i ii iv iii
  • a b c d
    iii iv i ii

D.

a b c d
iii iv i ii

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