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.
Which ecosystem has the maximum biomass?
Forest ecosystem
Grassland ecosystem
Pond ecosystem
Pond ecosystem
A.
Forest ecosystem
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 |
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
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.