551: Which one of the following plants is effective in reducing water pollution and is also useful for producing bio gas ?
(a) Eucalyptus
(b) Water hyacinth
(c) Salvinio
(d) Lotus
552: What is the system of governance in the Panchayati Raj setup ?
(a) Single-tier structure of local self-government at the village level
(b) Two-tier system of local self-government at the village and block levels
(c) Three-tier structure of local self-government, at the village, block and district levels
(d) Four-tier system of local self-government at the village, block, district and state levels
553: Governor of which State has been entrusted with the special powers for the administration of tribal areas?
(a) Bihar
(b) Madhya Pradesh
(c) Assam
(d) Arunachal Pradesh
554: Consider the following Bhakti Saints :
1. Dadu Dayal
2. Guru Nanak
3. Tyagaraja
Who among the above was/were preaching when the Lodi dynasty fell and Babur took over?
(a) 2 only
(b) 1 and 3
(c) 2 and 3
(d) 1 and 2
555: Tarun Bharat Sangh, an organization based in a village near Alwar (Rajasthan), has become famous because of:
(a) Cultivation of genetically modified cotton
(b) Rehabilitation of women victims of AIDS
(c) Livelihood projects for destitute rural women
(d) Rain-water harvesting