2 April is observed as –

The correct answer is: D. International Day for Biological Diversity, recognized by the UN

2 April is observed as the International Day for Biological Diversity, recognized by the United Nations. It was established in 1993 by the United Nations General Assembly to increase understanding and awareness of the importance of biodiversity. The day also celebrates the signing of the Convention on Biological Diversity in 1992.

Biological diversity is the variety of life on Earth. It includes the variety of plants, animals, and microorganisms, as well as the variety of ecosystems in which they live. Biodiversity is essential for human health and well-being. It provides us with food, water, medicine, and other resources. It also helps to regulate the climate and protect us from natural disasters.

The loss of biodiversity is a serious threat to our planet. It is caused by human activities such as habitat destruction, pollution, and climate change. The loss of biodiversity can lead to the extinction of species, the disruption of ecosystems, and the decline of human health.

We can all help to protect biodiversity. We can do this by reducing our consumption of resources, supporting sustainable agriculture, and conserving natural habitats. We can also educate others about the importance of biodiversity and encourage them to take action to protect it.

Here is a brief explanation of each option:

• A. World day for War Orphans is observed on 6 June. It was established by the United Nations General Assembly in 2002 to raise awareness of the plight of war orphans and to promote their rights.
• B. United Nations Day for South-South Cooperation is observed on 12 September. It was established by the United Nations General Assembly in 2005 to promote South-South cooperation, which is the cooperation between developing countries.
• C. World Austim Awareness Day, recognized by the UN is observed on 2 April. It was established by the United Nations General Assembly in 2007 to raise awareness of autism spectrum disorder and to promote the rights of people with autism.