Explain ecological pyramids
Asked by raginigupta445 | 20th Jan, 2016, 05:01: PM
- An ecological pyramid is a graphical representation of an ecological parameter, such as numbers, biomass or accumulated energy, at different trophic levels in a food chain in an ecosystem.
- These pyramids are also called Eltonian pyramids named after their discoverer Charles Elton in 1927.
- The base of the pyramid always represents the producers or the first trophic level, and the apex represents the top level consumer or the last trophic level.
- Ecological pyramids are of three types—pyramid of numbers, pyramid of biomass and pyramid of energy.
Pyramid of numbers
- A pyramid of numbers is constructed on the basis of the number of individuals which occupy a particular trophic level in a given area at a given time.
Pyramid of biomass
- A pyramid of biomass is a graphical representation of biomass or organic matter present per unit area in different trophic levels.
Pyramid of energy
- A pyramid of energy is a graphical representation of energy flow within an ecosystem.
Answered by Sheetal Kolte | 20th Jan, 2016, 05:52: PM
- recombinant DNA tecnology
- please answer
- What is ori? state its importance during cloning of a vector?
- What is the host that produces a foreign gene product called? What is this product called?
- State the uses of cloning vector in biotechnology.
- Who developed the technique of electrophoresis? State its principle.
- Explain any two methods of vectorless gene transfer.
- What is genetic engineering? List the steps involved in rDNA technology.
- How can DNA segments be separated by gel electrophoresis, visualised and isolated?
- Study the linking of DNA fragments shown below: (i) Name 'a' DNA and 'b' DNA. (ii) Name the restriction enzyme that recognises this palindrome. (iii) Name the enzyme that can link these two DNA fragments.
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