Which of the following planet is known as "blue planet"?

Appeared in: NORCET -4 , 2023

Explanation

Earth is called the 'Blue Planet' because about 71% of its surface is covered by the hydrosphere (water), mainly oceans.
When observed from space, the reflection of sunlight off the water's surface gives Earth a prominent blue color.
It is the only planet in our solar system known to harbor life and possess liquid water on its surface.

Option A: Saturn is a gas giant, most famous for its extensive and prominent system of rings made of ice and rock particles, not for being blue.
Option C: Mars is known as the 'Red Planet'. Its reddish appearance is due to the prevalence of iron oxide (rust) on its surface.
Option D: Jupiter is the largest planet in our solar system and is classified as a gas giant. It is known for its Great Red Spot, a massive storm, but not for being the 'Blue Planet'.

Visual 1: Image - A photograph of Earth taken from space, clearly showing the blue oceans, white clouds, and continents. This visual directly illustrates why it is called the 'Blue Planet'.
Visual 2: Infographic - A chart comparing the key features and nicknames of the four planets mentioned (Saturn, Earth, Mars, Jupiter) to help differentiate them.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Characteristics of Planets in the Solar System as background academic context rather than a clinical decision trigger.
This question tests general knowledge, which is a component of some nursing entrance and recruitment examinations in India.
While not a clinical topic, a broad general awareness is considered a trait of a well-rounded professional.
What if the question asked about the 'Red Planet'? The answer would change to Mars, as its surface is rich in iron oxide, giving it a distinct reddish hue.

How to Approach the Question

This is a factual recall question from general knowledge.
First, read the question carefully to identify the key term: 'blue planet'.
Recall or access your knowledge about the characteristics of the planets in the solar system.
Evaluate each option: Saturn (rings), Earth (water/blue), Mars (iron oxide/red), Jupiter (gas giant/Great Red Spot).
Identify that Earth's vast oceans give it a blue appearance from space.
Select the option that correctly matches the description 'blue planet'.

Concept Tested & Keywords

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Practise the full NORCET -4 , 2023

Attempt every question from this paper in a timed mock, then review the full solution for each one.