Science 2004 CBSE [ All India ] Set III

Name the excretory units present in an earthworm.

A farmer floods his field everyday thinking that watering in this manner will result in a better yield of his wheat crop. What will be the result of this action of the farmer?

State one of the evolutionary forces leading to the origin of a new species according to the synthetic theory of evolution.

Name one non-metal and one metal which are in liquid state at room temperature.

Name two other planets of the Solar System which are similar to the Earth in composition and structure.Out of syllabus

 Write the functional group present in the compound CH₃NH₂ and name it. Out of syllabus.

How can we locate the Pole Star in the sky at night?Out of syllabus

How is the rate of reaction influenced by              
a) raising the temperature of reactants?
b) Adding to the reacting mixture a product of reaction without change in volume?

Out of syllabus

What is formalin? How does it react with Tollen’s reagent? State any one of its uses.

Complete the following reaction equations:

(i) CH₂CH₂OH +2Na

(ii) HCHO + HCN