Pluto has recently been demoted to `dwarf planet` because it does not meet one or more of the following criteria of a planet : 1. A planet should orbit around the sun. 2. A planet should have sufficient mass, so that it assumes a nearly round shape. 3. A

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Q: 46 (CDS-I/2007)
Pluto has recently been demoted to 'dwarf planet' because it does not meet one or more of the following criteria of a planet :
1. A planet should orbit around the sun.
2. A planet should have sufficient mass, so that it assumes a nearly round shape.
3. A planet must hav e cleared its neigh bourhood around its orbit.

Select the correct answer using the codes given below:

question_subject: 

Geography

question_exam: 

CDS-I

stats: 

0,11,24,17,4,3,11

keywords: 

{'dwarf planet': [1, 0, 1, 1], 'pluto': [1, 0, 0, 0], 'planet': [4, 0, 1, 1], 'orbit': [0, 0, 1, 1], 'criteria': [0, 0, 1, 4], 'round shape': [0, 0, 1, 0], 'sun': [3, 0, 0, 6]}

The correct answer is option 4, which states that only criterion 3 - a planet must have cleared its neighborhood around its orbit - is not met by Pluto.

Let`s analyze each option to understand why option 4 is correct:

Option 1 states that criteria 1, 2, and 3 are not met by Pluto. However, this is incorrect because criterion 1 - a planet should orbit around the sun - is indeed satisfied by Pluto.

Option 2 states that criteria 2 and 3 are not met by Pluto. This is also incorrect because criterion 2 - a planet should have sufficient mass, so that it assumes a nearly round shape - is satisfied by Pluto. However, criterion 3 is indeed not met by Pluto.

Option 3 states that only criterion 2 is not met by Pluto. This is incorrect because criterion 2 is actually satisfied by Pluto. So, option 3 is not the correct answer.

Finally, option 4 correctly states that only criterion 3 is not met by Pluto. Pluto has been classified as a dwarf planet because it has not cleared its neighborhood around its orbit. This means that it shares its orbit with other objects of similar size, unlike the eight other planets in our solar system that have cleared their orbits.