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Standard XII
Biology
Introduction to Pollution
Question

Which of the following statements about Radioactive pollution are correct?
1. It causes genetic changes in the animals.
2. It causes disbalance among different minerals in the soil.
3. It hinders blood circulation.
4. It causes cancers.
Select the correct answer from the codes given below:

A
1 and 4
B
1 and 2
C
1, 3 and 4
D
2, 3 and 4
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Solution
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Correct option is B. 1 and 4
Radioactive contamination or pollution causes severe life- threatening consequences in organisms. Because of the radioactive decay of the contaminants, which emit harmful ionising radiation such as alpha or beta particles, gamma rays or neutrons, genetic mutations occur which are hereditary. Carcinogenic contaminants cause cancer.

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Q1
Which of the following statements about Radioactive pollution are correct?
1. It causes genetic changes in the animals.
2. It causes disbalance among different minerals in the soil.
3. It hinders blood circulation.
4. It causes cancers.
Select the correct answer from the codes given below:
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Q2
Which among the following statements about the North Atlantic Drift is/are correct?
1. It keeps the West coast of Northern Europe ice free.
2. It is responsible for the warm air mass which interacts with the cold air mass from the Polar region and causes rainfall in Western Europe.
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Q3
Identify the correct statement/statements :
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d) The damage caused due to α-radiation is small due to its small penetrating power
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Q4
Q. With reference to the causes of the Battle of Buxar, which of the following statements is/are incorrect? Select the correct answer using the codes given below:

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  2. 2 and 3 only

  3. 3 only

  4. 1 and 3
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Q5
Consider the following statements :

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