Draw a 'pyramid of numbers' of a situation where a large population of insects feed upon a very big tree. The insects in turn, are eaten by small birds which in turn are fed upon by big birds.
(b) Differentiate giving reason, between the pyramid of biomass of the above situation and the pyramid of numbers that you have drawn.

Draw a pyramid of numbers of a situation when a large population of insects feed upon a very big tree. The insects in turn are eaten by small birds which in turn are fed upon by big birds.

If we count the number of insects on a tree and number of small birds depending on those insects as also the number of larger birds eating the smaller, what kind of pyramid of number would we get?

In a botanical garden of a city there is a huge banyan tree growing on which hundreds of birds and thousands of insects live. Draw the pyramids of numbers and also biomass represented by this community. Comment giving reasons on the two different pyramids drawn.

In a botanical garden of a city there is a huge banyan tree growing on which hundreds of birds and thousands of insects live. Draw the pyramids of numbers and also biomass represented by this community. Comment giving reasons on the two different pyramids drawn.

Figure 6.36 shows a potentiometer with a cell of emf 2.0 V and internal resistance 0.4 Omega maintaining a potential drop across the resistor wire AB . A standard cell that maintains a constant emf of 1.02 V (for very moderate current up to emf mu A ) gives a balance point at 67.3 cm length of the wire. To ensure very low current is drawn the standard cell, a very high resistance of 600 k Omega is put in series with it, which is shorted close to the balance point. The standard cell is then replaced by a cell of unknown emf epsilon and the balance point found, similary, turns out to be at 82.3 cm length of the wire. a. What is the value of epsilon ? b.What purpose does the high resistance of 600 k Omega have? c. Is the balance point affected by this high resistance? d. Is the balance point affected by internal resistance of the driver cell? e. Would the method work in the above situation if the driver cell of the potentiometer had an emf of 1.0 V instead of 2.0 V ? f. Would the circuit work well for determining an extermely small emf, say of the order of a few mV (such as the typical emf of a thermocouple)? If not, how will you modify the circuit ?

select the pyramid of energy which correctly depicts A tree supporting on number of herbivorous birds which are eaten by 1 or 2 hawks of the area (A-tree, B-herbivorous birds, C-Hawks )