Question

Which of the following statements is/are correct ?
(A) Anticyclones are regions of high pressure and cause clockwise wind circulation in northern hemisphere.
(B) Anticyclones are regions of low pressure but cause clockwise wind circulation in northern hemisphere.
(C) Cyclons are regions of low pressure with circular wind motion.
Choose the correct answer from the options given below:

• A. (A) and (B) only.
• B. (A), (B) and (C) only.
• C. (B) and (C) only.
• D. (A) and (C) only.

Hint:

To easily remember wind directions in the Northern Hemisphere:
- Cyclone \(\rightarrow\) Counter-clockwise, Low pressure (CCL).
- Anticyclone \(\rightarrow\) Clockwise, High pressure (ACH).

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
Cyclones and anticyclones are large-scale weather systems characterized by circular wind motions around low-pressure and high-pressure centers, respectively.
Their wind circulation directions are governed by the Coriolis force, which acts in opposite directions in the Northern and Southern Hemispheres.

Step 2: Detailed Explanation:
Let us evaluate each statement:
- Statement (A): "Anticyclones are regions of high pressure and cause clockwise wind circulation in the northern hemisphere."
This statement is correct. An anticyclone is a weather system with high atmospheric pressure at its center.
Winds blow outwards from the high-pressure center.
Due to the Coriolis effect in the Northern Hemisphere, these winds are deflected to the right, creating a clockwise circulation pattern.
- Statement (B): "Anticyclones are regions of low pressure..."
This statement is incorrect. Anticyclones are high-pressure systems, not low-pressure systems.
- Statement (C): "Cyclones are regions of low pressure with circular wind motion."
This statement is correct. A cyclone is characterized by a low-pressure center.
Winds blow inward toward the low-pressure center.
In the Northern Hemisphere, this inward flow is deflected to the right, causing a counter-clockwise circular wind motion.
Therefore, only statements (A) and (C) are correct.

Step 3: Final Answer:
The correct option is (D).