Answer: Option D. -> Ozone layer
:
D
$\bullet$ Ozone layer acts as a shield which absorbs the harmful UV rays from the sun and is found in the stratosphere.
$\bullet$ Global warming is a phenomenon of climate change which is characterised by an increase in the average temperature of the Earth. It is directly linked to the increase of greenhouse gases like carbon dioxide and methane into the atmosphere.

Answer: Option A. -> True
:
A
Biosphere reserves are large areas of protected land for conservation of wildlife, its resources and traditional life of the tribals living in the area.

Answer: Option B. -> biodiversity
:
B
Hotspots are the areas of high endemism and high level of species richness. There aee some 34 hotspots identified. Out of which 3 of them occur in India- Western Ghats and Sri Lanka, Indo-Burma and Himalaya. Hotspots cover less than 2% of the total area but contain around 44% of species.

Answer: Option C. -> Ecosystem
:
C
Plants, animals, microbes, weather, soil andwater all are the components of anecosystem. The ecosystemincludes all the living things or the biotic componentsin a given area and their interactionwith each other, and also with thenon-living or abiotic components like weather, soil, water and atmosphere.

Answer: Option D. -> Biodiversity equilibrium
:
D
Biodiversity equilibrium means to maintain a balance between the variety and variability of life on Earth which gets influenced by deforestation. Deforestation is a major cause which leads to the change in soil properties. Fewer trees result in more soil erosion. Removal of the top layer of the soil exposes the lower, hard and rocky layers. This soil has less humus and is less fertile. Gradually the fertile land gets converted into deserts. It is called desertification. It also leads to a decrease in the water-holding capacity of the soil. The movement of water from the soil surface into the ground is reduced. So, there are floods.

Answer: Option B. -> False
:
B
Wildlife sanctuaries are protected forests whichaim to conserve the flora and fauna endemic to that area. But, even with protection, these forests are not completely safe because people living in the neighbourhood encroach upon and destroy them.

Answer: Option A. -> Animals move freely inside a national park
:
A
In any national park, the animals and plants are aimed to be conserved in their natural habitat so for that the wild animals are not kept in captivity. Hence, tourists watch them through a well-protected vehicle for their own safety.

Answer: Option B. -> Red data book
:
B
The Red Data Book is a type of a public document, which is created to keep a recordof endangered and rare species including plants, animals, fungi as well as some local subspecies, which are present within the region of the state or country. The red data book helps us in providing complete information for research, studies and also for monitoring the programs on rare and endangered species and their habits. This book is mainly created to protect those species, which are on the verge of extinction, lost, harmed or not able to continue their life cycle. These species can either be animals, birds or plants.

:
Migratory birds fly to far away areas every year during a particular time because of climatic changes. They fly for laying eggs as the weather in their natural habitat becomes very cold and inhospitable.

Answer: Option A. -> Forest Conservation Act
:
A
TheForest Conservation Act 1980, was implementedto help conserve the country's forests. It strictly restricts and regulates the use of forest land for non-forest purposes without the prior approval of Central Government.