Q13 of 26 Page 1

Compare the two ecological pyramids of biomass given below and explain the situations in which this is possible. Also construct an ideal pyramid of energy if 200,000 joules of sunlight is available.

An ecological pyramid shows the relation between the producers and the consumers in an ecosystem represented in the form of a pyramid.

The first pyramid of biomass depicts Terrestrial Ecosystem.


The second pyramid of biomass depicts Standing crops of Phytoplankton supporting the aquatic ecosystem.



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11

Explain three outbreeding devices.

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After implantation interdigitation of maternal and fetal tissues takes place. Identify the tissues involved and justify their role.

 14

With respect to Messelson and Stahl’s Experiment, answer the following questions:

(a) Identify the method used to distinguish between heavy and light isotopes of nitrogen.


(b) With the help of diagrams, compare the results for the DNA isolated after 20 minutes of experiment with the DNA which was isolated after 40 minutes.


 15

A student was simulating Urey and Millers experiment to prove the origin of life. The set up used by the student is given


(a) Find out the reasons why he could not get desired results. (b) What conclusion was drawn by Urey and Miller through this experiment?


(c) Compare the conclusion drawn with the theory of spontaneous generation.