131: Photosynthesis generally occurs in which portions of the plant?
(a) Leaf and other chloroplast bearing parts
(b) Steam and leaf
(c) Roots an chloroplast bearing parts
(d) Bark and leaf
132: Age of tree can be estimated by:
(a) Counting the number of concentric rings
(b) Counting the nodes and internodes of the trunk
(c) Measuring the girth of the tree trunk
(d) Counting the number of branches
133: Consider the following statements :
Coke is one of the materials of the charge added to blast furnace for the production of steel/iron. Its function is to
I. act as a reducing agent.
II. remove silica associated with the iron ore.
III. function as fuel, to supply heat.
IV. act as an oxidizing agent.
Of these statements:
(a) I and II are correct
(b) II and IV are correct
(c) I and III are correct
(d) III and IV are correct
Explanation:
Coke is used as a reducing agent and source of heat in the furnace, while silica is removed by the limestone.
134: With reference to solar power production in India, consider the following statements:
1. India is the third largest in the world in the manufacture of silicon wafers used in photovoltaic units.
2. The solar power tariffs are determined by the Solar Energy Corporation of India.
Which of the statements given above is/are correct?
(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2
135: 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