Correct answer
D. Both (a) & (b)
Explanation
The correct answer is Both (a) & (b).
Energy flow and energy transformations in living systems strictly conform to the:
Agriculture is the major land-use in Pakistan. The cultivable area is ________ million ha. i.e. 36.7% of total area:
The conifers rarely exceed 8 m. In height, the broadleaved trees reach about 9m. And the shrub growth about ________
When excess of sewage is dumped in the river, its BOD:
The reservoir of Mangla is being silted at the rate of 48.27 million m3 per year and that of Tarbela at the rate of ________ million cubic meters per year:
According to Mc Dougal, the parasitism caused due to fungi and bacteria represent a symbiotic relationship which is: