221: Which one of the following statements is correct?
(a) Prions are the smallest free-living cells
(b) The cell wall of Mycoplasmas is made up of amino sugars
(c) Viroids consist of a single-stranded RNA molecule
(d) Rickettsias lack cell wall
222: Which one of the following statement correctly describes the Fourth Schedule of the Constitution of India ?
(a) It lists the distribution of power between the Union and the States
(b) It contains the languages listed in the Constitution
(c) It contains the provisions regarding the administration of tribal areas
(d) It allocates seats in the Council of States
223: MERCOSUR consists of group of countries of
(a) Africa
(b) Asia
(c) Latin America
(d) South East Asia
224: In the year 2001, India offered a grant of five million dollars to Tajikistan to
(a) tackle the drought situation
(b) set up a software Technology Park
(c) promote mineral exploration
(d) procure defence equipment
225: What can be the impact of excessive / inappropriate use of nitrogenous fertilizers in agriculture?
1. Proliferation of nitrogen-fixing microorganisms in soil can occur.
2. Increase in the acidity of soil can take place.
3. Leaching of nitrate to the ground-water can occur.
Select the correct answer using the code given below.
(a) 1 and 3 only
(b) 2 only
(c) 2 and 3 only
(d) 1, 2 and 3