In environmental awareness, World Environment Day is celebrated internationally on which of the following dates each year?

Introduction / Context:
This question deals with one of the most important environmental observances in the world. World Environment Day is a flagship United Nations day for encouraging worldwide awareness and action for the protection of the environment. It is very commonly asked in exams because it combines knowledge of dates with environmental studies, a high-priority topic in modern education.

Given Data / Assumptions:

• The observance is World Environment Day.
• The options are June 5, April 7, October 24, and None of the above.
• We must pick the correct date on which this day is celebrated every year.

Concept / Approach:
The United Nations designated 5 June as World Environment Day to mark the opening of the United Nations Conference on the Human Environment held in Stockholm in 1972. Since then, 5 June each year is used to focus global attention on urgent environmental issues such as pollution, climate change, and biodiversity loss. April 7 is World Health Day and October 24 is United Nations Day, so those dates are not correct for this particular observance.

Step-by-Step Solution:
Step 1: Identify the key observance: World Environment Day. Step 2: Recall that the United Nations celebrates World Environment Day on 5 June every year. Step 3: Examine the options: June 5, April 7, October 24, and None of the above. Step 4: Confirm that June 5 exactly matches the known date of World Environment Day. Step 5: Recognise that April 7 is associated with World Health Day, not with environment day. Step 6: Recognise that October 24 is associated with United Nations Day, not this environmental observance, so “None of the above” is also incorrect.

Verification / Alternative check:
Checking any UN environment portal, government environmental department website, or basic GK text will confirm that World Environment Day is held annually on 5 June. It is one of the most publicised international days, often associated with tree planting campaigns, awareness rallies, and environmental education programmes.

Why Other Options Are Wrong:
April 7: Observed as World Health Day under the World Health Organization, not for environmental themes.
October 24: Observed as United Nations Day, marking the entry into force of the UN Charter.
None of the above: Incorrect because June 5 is indeed the correct date.

Common Pitfalls:
A common mistake is to confuse environmental days such as Earth Day (22 April) and World Environment Day (5 June). While both focus on the environment, exams usually expect you to know that Earth Day is on 22 April and World Environment Day is on 5 June. Carefully distinguishing these dates helps avoid losing easy marks.

Final Answer:
Therefore, World Environment Day is celebrated each year on June 5.