Question

Biologists observe 5th June as
(a)Darwin Birthday
(b)World Environment Day
(c)World Population Day
(d)World Hygiene

Answer 1

Hint: It is the flagship campaign to spread awareness about environment protection and health. The festival of this day gives a chance to broaden the basis for an enlightened opinion and responsible conduct by individuals, communities, and enterprises in preserving and improving the environment.

Complete answer:
Biologists observe 5th June as World Environment Day. It was first held in 1974. It is an initiative by the United Nation to encourage awareness about the protection of the environment, emerging marine pollution, human overpopulation, wildlife crime, global warming, and practicing sustainable development. UNESCO has a significant history in progressing biological sciences by pioneering work on ecosystems, capacity building, biosphere reserves, scientific assessments, and policy briefs to assist decision-makers in managing natural resources sustainably.

Additional Information: Sustainable development or sustainable consumption, is the usage or the resources of nature in a sustainable, meaning in the amount which is needed, and not using more than the requirement, to save the resources for the future generation, giving the resources enough time to reflourish.
The greenhouse effect is a naturally occurring phenomenon needed to maintain the earth’s temperature and warmth. The clouds and atmospheric gasses trap the solar radiation, and only some of it escapes out of the atmosphere. However, when the amount of greenhouse gasses, increases a lot, it leads to overheating and eventually global warming, a major cause of deterioration of the earth’s resources.
Darwin Birthday: Charles Robert Darwin was born on the 12th of February, 1809. So, the 12th of February is celebrated as Darwin’s day to highlight Darwin’s contributions to science.
World Population Day: It is an annual event observed on 11 July every year. This event was established by the United Nations development program, 1989. The aim of this day is to increase people's awareness of various population issues.
World Hygiene: This day is celebrated on 5th May every year to spread awareness about the importance of hand hygiene in the healthcare regime.
So, the correct answer is ‘world environment day’.

Note: -In the absence of the Greenhouse effect, the average temperature of Earth would have been -18 degrees celsius, rather than the now 15-degree celsius.
-There are four main types of pollution - air pollution, water pollution, soil pollution, and noise pollution.