PLEASE GIVE ME HARDEST 10TH CLASS SCIENCE QUESTION CBSE
Answers
Answer:
Given below are some very important long answer type questions to prepare for CBSE Class 10 Science Exam 2021:
Question 1. (a) Write chemical equations for the reactions involved in obtaining pure alumina from the mineral bauxite which has impurities of iron oxide and silica.
(b) Draw a labelled diagram of the electrolytic tank cell used for the extraction of aluminium from alumina.
Answer.
The reaction involved in obtaining pure alumina from the mineral bauxite having impurities of iron oxide and silica is:
Answer:
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Explanation:
Q 1 - What is a gene? [Delhi]
Q 2 - What is meant by analogous organs? Taking a suitable example, explain how they support the theory of Organic Evolution.
Q 3 - Define ‘evolution’. Describe Darwin’s theory of evolution. [All India]
Q 4 - What are fossils? What do they tell us about the process of evolution?
Q 5 - Explain the phenomenon of “biological magnification” How does it affect organisms belonging to different trophic levels particularly the tertiary consumers?
Q 6 - Describe how decomposers facilitate recycling of matter in order to maintain balance in the ecosystem.