Deforestation and Land Degradation

Acid rain is primarily caused by industrial emissions (sulfur dioxide and nitrogen oxides) resulting from human activity, which then damages aquatic ecosystems.

Deforestation and pollution destroy habitats and degrade ecosystems, which can lead to the permanent loss of species (extinction).

Both deforestation and water pollution can permanently eliminate species by destroying habitats and contaminating resources, making it impossible for those species to recover. Once a species goes extinct, it cannot be brought back.

Removing all trees eliminates the primary producers and structural foundation of the rainforest ecosystem. This causes a total collapse of the food web and habitat, whereas selective harvesting has a much smaller impact.

Deforestation removes the plants that provide habitat for various species, leading to a direct loss of biological variety in that area. It also disrupts local food webs and ecological niches.

As the human population grows, the consumption of nonrenewable resources increases to meet the needs for energy and materials. This leads to the depletion of these finite supplies.

Forests provide essential resources including food, timber, and medicinal plants. Options like burning or cutting down trees are destructive activities rather than uses of the forest ecosystem.

Tree roots bind soil particles together, which significantly reduces soil erosion and stabilizes slopes against landslides. Therefore, the statement that they do not prevent these issues is false.

Industrial agriculture, through practices like tilling, overgrazing, and deforestation, is the primary driver of global soil erosion. While natural events occur, human agricultural activity significantly accelerates the rate of topsoil loss.

Commercial fish populations have declined due to a combination of factors. Both pollution and overfishing are primary drivers of these population crashes.

There is no significant issue regarding nuclear waste ruining banana crops in Sri Lanka. The other options listed are recognized environmental challenges in the region.

When vegetation is removed through logging or farming, the soil is no longer held in place by roots, making it susceptible to being carried away by wind or water, which is erosion.

Reforestation is the process of planting trees in an area where forests were previously destroyed. This helps to reduce pollution, absorb carbon dioxide, and lower the temperature, making the statement false.

The removal of the top layer of soil, often caused by deforestation or overgrazing, exposes the lower, harder, and less fertile layers, leading to the process known as desertification.

Deforestation removes trees that absorb carbon dioxide and release oxygen, thus causing an imbalance in these gases. Additionally, the loss of forest cover contributes to higher local temperatures, making both (a) and (b) correct.