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51.

How do some bacteria carry out nitrification? What are such bacteria called?

Answer» Some bacteria carry out nitrification to obtain energy required for their activites. Such bacteria are called chemoautotrophs
Discussion
52.

Which are the two macronutrients that usually play the most important role in limiting plant growth globally?

Answer» Nitrogen and Phosphorus
Discussion
53.

Why do plants of the legume family usually contain more protein than other plants?

Answer» Plants of legume family have root nodules in which the symbiotic bacteria Rhizobium fixes atmospheric nitrogen into ammonia. The ammonia is then converted to amino acids and proteins by leguminous plants:
Discussion
54.

Match the following and choose the correct combination from the options given `{:(,"Column I",,"Column II",),(A,"Potassium",1,"Constituent of ferredoxin",),(B,"Sulphur",2,"Involved in stomatal movement",),(C,"Molybdenum",3,"Needed in the synthesis of auxin",),(D,"Zinc",4,"Component of nitrogenase",):}`A. a-2,b-1,c-4,d-3B. a-1,b-2,c-3,d-4C. a-3,b-4,c-1,d-2D. a-1,b-3,c-4,d-2

Answer» Correct Answer - A
Discussion
55.

Fill in the blanks A. Amides are generally formed by combination of ……….. And ……… B. Transamination involves transfer of ………group from one amino acid to the …………group of keto acid. c. Nitrogen fixing plants have the enzyme ……….in their nodules, which is protected by the pigment D. An example of symbiosis in root nodules of legumes is with ........... E. The..............path way involves movement of minerals by simple diffusion from cell to cell through their primary cell walls. F. Macronutrients must generally be present in plant tissues in concetration of ........to .........mg per gram of dry matter.

Answer» A. ammonia, amino acids, B. amino, keto, C. nitrogenase, leghaemoglobin, D. Rhizobin, E. apoplastic, F. 1, 1
Discussion