In case of which one of the following biogeochemical cycles, the weathering of rocks is the main source of release of nutrient to enter the cycle?

What are the impediments in disposing the huge quantities of discarded solid wastes which are continuously being generated? How do we remove safely the toxic wastes that have been accumulating in our habitable environment?

What are the key features of the National Clean Air Programme (NCAP) initiated by the Government of India?

(a) Examine the importance of Development Planning in Indian Mixed Economy, and analyze its problems and prospects. (b) Highlight the main features of the 'Inter-linking of Rivers' project in India. What could be its probable advantages to Indian agriculture? (c) Has reduction of green cover affected ecological degradation leading to global warming? Elaborate your answer with illustration.

Mycorrhizal biotechnology has been used in rehabilitating degraded sites because mycorrhiza enables the plants to 1. resist drought and increase absorptive area 2. tolerate extremes of pH 3. resist disease infestation Select the correct answer using the codes given below.