With reference to weathering and climate, consider the following statements: 1. Climatic factors being equal, the intensity of exogenic geomorphic processes depends on the type and structure of rocks. 2. A particular rock is equally resistant to all geomorphic processes. 3. The effects of exogenic processes are always rapid and perceptible in a short time span. Which of the statements given above is/are correct?

Correct Option The correct option is 1 only Explanation Exogenic geomorphic processes derive their energy primarily from the atmosphere (solar energy) and gravity. While climate is a dominant factor regulating these processes, the inherent characteristics of the lithosphere-specifically the type and structure of rocks-play a crucial role in determining the intensity and outcome of weathering and erosion. Statement-wise Analysis - Statement 1 is Correct: Even if climatic factors (temperature and precipitation) remain constant, the intensity of exogenic processes varies based on the type and structure of rocks. For instance, under the same climatic conditions, limestone may weather rapidly due to carbonation, whereas quartzite remains resistant. Structural features like folds, faults, joints, and bedding planes also influence how rocks respond to external forces. - Statement 2 is Incorrect: No single rock type is equally resistant to all geomorphic processes. A rock may be highly resistant to physical weathering (e.g., abrasion) but susceptible to chemical weathering (e.g., solution). For example, limestone is resistant to mechanical erosion in arid regions but dissolves easily in humid regions. Resistance is specific to the process involved. - Statement 3 is Incorrect: The effects of exogenic processes are not always rapid. While some processes like landslides or avalanches are sudden and perceptible, most exogenic processes (such as weathering, soil formation, and gradual erosion) act slowly over long periods. Their cumulative effects may become visible only after thousands or millions of years. Key Takeaway Key Takeaway: The rate and intensity of exogenic processes are determined by the interplay of climatic zones and the geological structure (lithology) of the region. These processes are generally slow and imperceptible in the short term, unlike sudden endogenic events.

With reference to weathering and… - NCERT Class 11 Geography MCQ

NCERT Class 11 Geography — Chapter 4: Geomorphic Processes

mcqmedium

With reference to weathering and climate, consider the following statements:

Climatic factors being equal, the intensity of exogenic geomorphic processes depends on the type and structure of rocks.
A particular rock is equally resistant to all geomorphic processes.
The effects of exogenic processes are always rapid and perceptible in a short time span.

Which of the statements given above is/are correct?

NCERT textbook question

From NCERT Fundamentals of Physical Geography · Page 40

Options

A1 and 3 only
B1, 2 and 3
C2 only
D1 only

Did you get this right?

Solution

Correct Option

The correct option is

1 only

Explanation

Exogenic geomorphic processes derive their energy primarily from the atmosphere (solar energy) and gravity. While climate is a dominant factor regulating these processes, the inherent characteristics of the lithosphere-specifically the type and structure of rocks-play a crucial role in determining the intensity and outcome of weathering and erosion.

Statement-wise Analysis

Statement 1 is Correct: Even if climatic factors (temperature and precipitation) remain constant, the intensity of exogenic processes varies based on the type and structure of rocks. For instance, under the same climatic conditions, limestone may weather rapidly due to carbonation, whereas quartzite remains resistant. Structural features like folds, faults, joints, and bedding planes also influence how rocks respond to external forces.
Statement 2 is Incorrect: No single rock type is equally resistant to all geomorphic processes. A rock may be highly resistant to physical weathering (e.g., abrasion) but susceptible to chemical weathering (e.g., solution). For example, limestone is resistant to mechanical erosion in arid regions but dissolves easily in humid regions. Resistance is specific to the process involved.
Statement 3 is Incorrect: The effects of exogenic processes are not always rapid. While some processes like landslides or avalanches are sudden and perceptible, most exogenic processes (such as weathering, soil formation, and gradual erosion) act slowly over long periods. Their cumulative effects may become visible only after thousands or millions of years.

Key Takeaway

Key Takeaway: The rate and intensity of exogenic processes are determined by the interplay of climatic zones and the geological structure (lithology) of the region. These processes are generally slow and imperceptible in the short term, unlike sudden endogenic events.

Your note

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