Q2 of 39 Page 65

How are organisms like Pseudomonas and Thiobacillus of great significance in nitrogen cycle?

Pseudomonas and Thiobacillus are involved in the process of denitrification during the nitrogen cycle.During denitrification the nitrate present in the soil is converted to free nitrogen thus contributing to presence of nitrogen in the air.


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16

Excess of Mn in soil leads to defeciency of Ca, Mg and Fe. Explain.

 1

How is sulphur important for plants? Name the aminoacids in which it is present.

 3

Carefully observe the following figure


a. Name the technique shown in the figure and the scientist who demonstrated this technique for the first time.


b. Name atleast three plants for which this technique can be employed for their commercial production.


c. What is the significance of aerating tube and feeding funnel in this setup?


 4

Name the most crucial enzyme found in root nodules for N2 fixation? Does it require a special pink coloured pigment for its functioning? Elaborate.