निम्नलिखित में

Which of the following is a common type of nitrogen-fixing bacteria that forms a symbiotic relationship with leguminous plants?

Given below are two statements:

Statement I

A vector in a GIS system is the graphic or visual data model

Statement II

What is the main concern regarding the utilization of agricultural land in the hill region of Uttarakhand?

What will be the percentage of porosity of a soil which has 1.5g/cm³ bulk density and 2.65 g/cm³ particle density?

The excess of which of the following gases causes acid rain in the environment?