Consider the following statements regarding the Sahara's past: 1. It used to be a lush green plain. 2. It has always been a hot and dry region since its formation. Which of the statements given above is/are correct?

Correct Option The correct option is (a). Explanation The climatic history of North Africa indicates significant environmental transformations over geological time scales. Paleoclimatic evidence confirms that the region now known as the Sahara Desert experienced humid periods supporting extensive vegetation and animal life. Statement-wise Analysis - Statement 1 is Correct: Scientific evidence, including rock paintings found in the Tassili n'Ajjer region and paleoclimatic data, establishes that the Sahara was once a lush green plain. During the African Humid Period, the region supported rivers, lakes, and diverse fauna such as crocodiles, elephants, and hippopotamuses. - Statement 2 is Incorrect: The Sahara has not always been a hot and dry region. It underwent a gradual climatic shift (desertification) caused by changes in the Earth's orbital parameters and atmospheric conditions, transforming it from a humid ecosystem into the arid desert it is today. Key Takeaway: The Sahara Desert was historically a humid, vegetated region ("Green Sahara") before climatic changes transformed it into an arid hot desert.

Consider the following statements regarding the Sahara's… - NCERT Class 7 Geography MCQ

NCERT Class 7 Geography — Chapter 2: Life in the Deserts

mcqeasy

Consider the following statements regarding the Sahara's past:

It used to be a lush green plain.
It has always been a hot and dry region since its formation.

Which of the statements given above is/are correct?

NCERT textbook question

From NCERT The Earth Our Habitat · Page 2

Options

A1 only
B2 only
CBoth 1 and 2
DNeither 1 nor 2

Did you get this right?

Solution

Correct Option

The correct option is (a).

Explanation

The climatic history of North Africa indicates significant environmental transformations over geological time scales. Paleoclimatic evidence confirms that the region now known as the Sahara Desert experienced humid periods supporting extensive vegetation and animal life.

Statement-wise Analysis

Statement 1 is Correct: Scientific evidence, including rock paintings found in the Tassili n'Ajjer region and paleoclimatic data, establishes that the Sahara was once a lush green plain. During the African Humid Period, the region supported rivers, lakes, and diverse fauna such as crocodiles, elephants, and hippopotamuses.
Statement 2 is Incorrect: The Sahara has not always been a hot and dry region. It underwent a gradual climatic shift (desertification) caused by changes in the Earth's orbital parameters and atmospheric conditions, transforming it from a humid ecosystem into the arid desert it is today.

Key Takeaway: The Sahara Desert was historically a humid, vegetated region ("Green Sahara") before climatic changes transformed it into an arid hot desert.

Your note

More from Chapter 2: Life in the Deserts

The discovery of skeletons of which one of the following aquatic creatures in the Sahara Desert suggests a humid past?

easy

With reference to the people of the Sahara Desert, consider the following statements: 1. The Bedouins and Tuaregs are settled agricultural communities. 2. They rear livestock such as goats, sheep, camels, and horses. 3. They wear heavy robes as protection against dust storms and hot winds. Which of the statements given above is/are correct?

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With reference to the Sahara Desert, consider the following statements: 1. It covers a large part of North Africa. 2. It touches exactly three countries. 3. Its total area is more than double the area of India. Which of the statements given above is/are correct?

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Which of the following statements regarding the 'Tuaregs' is true? 1. They are traditionally nomadic tribes. 2. They are strictly prohibited from working in the oil and gas sector. 3. They act as guides to foreign tourists. Select the correct answer using the code given below:

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In the context of Ladakh, what is 'Shahtoosh'?

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