Science 2004 CBSE [ All India ] Set I
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Q1
Name the excretory units present in an earthworm. Marks:1View AnswerAnswer:
Out of syllabus. -
Q2
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? Marks:1View AnswerAnswer:
Out of syllabus. -
Q3
State one of the evolutionary forces leading to the origin of a new species according to the synthetic theory of evolution. Marks:1View AnswerAnswer:
Natural selection is one of the evolutionary forces leading to the origin of a new species according to the synthetic theory of evolution. -
Q4
How are the molecules of aldehydes and ketones structurally different? Marks:1View AnswerAnswer:
Aldehydes have the functional group 
whereas the ketones have the functional group 
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Q5
Name one non-metal and one metal which are in liquid state at room temperature. Marks:1View AnswerAnswer:
Bromine is the non-metal which is in liquid state at room temperature and mercury is the metal which is in liquid state at room temperature. -
Q6
Name two other planets of the Solar System which are similar to the Earth in composition and structure.Out of syllabus Marks:1View AnswerAnswer:
Out of syllabus. -
Q7
How is the strength of the magnetic field at a point near a wire related to the strength of the electric current flowing in the wire? Marks:1View AnswerAnswer:
Strength of the magnetic field at a point near a wire is directly proportional to the strength of the electric current flowing in the wire. As the current increases, the strength of magnetic field also increases. -
Q8
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
Marks:1View AnswerAnswer:
Out of syllabus -
Q9
Describe how the sex of the offspring is determined in the zygote in human beings. Marks:2View AnswerAnswer:
Sex of the offspring is determined in the zygote genetically by sex chromosomes inherited in it from its parents. If the zygote contains XX chromosomes, the offspring will be a female whereas presence of XY chromosomes results in a male. -
Q10
State any two practices which can help in the protection of our environment. Marks:2View AnswerAnswer:
(i) Prevention of cutting of the trees or planting of trees. (ii) Use of biodegradable substances.
