Q5 of 43 Page 1

Why is the rate of secondary succession much faster than that of primary succession?

The rate of secondary succession much faster than that of primary succession because in case of secondary succession, some or sediment is already present due to destruction of natural biotic communities present earlier.


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24

What is productivity in an ecosystem? Explain the relationship between gross primary productivity and net primary productivity in an ecosystem.

 25

(a) Work out a cross upto F2-generation between true breeding tall pea plants bearing violet flowers and dwarf pea plants bearing white flowers.

(b) Explain Mendel’s laws of segregation and independent assortment on the basis of the cross.


OR


Answer the following questions based on the experiment conducted by S.L. Miller in 1953:


(a) Name the gases present in the closed flask.


(b) Why was the flask fitted with electrodes?


(c) Write the observation he made.


(d) State the significance of the observation made by him.


 9

Name a distinguishing structure seen in a mature black pepper seed and not in a pea seed. State how does it develop?

 10

Why does the insecticidal protein produced by Bacillus thuringiensis not kill the bacterium, but kills the cotton bollworm? Explain.