Environmental Science In Agricultural - Study Mode

[#176] In recent years, there has been an increasing incidence of floods in Northern India because
Correct Answer

(C) There has been increased deforestation in the catchment areas

Explanation

Solution: In recent years, there has been an increasing incidence of floods in Northern India because there has been increased deforestation in the catchment areas. Deforestation or forest clearance is the removal of a forest or stand of trees from land that is then converted to non-forest use. Deforestation causes increases in temperatures and changes in the amount and distribution of rainfall generally creating a drier climate. These impacts can affect soil moisture, reducing yields in some areas and increasing flooding in others.

[#177] Silent valley (Kerala) is preserved because
Correct Answer

(C) It contains very rare species of plants and animals

Explanation

Solution: Silent valley (Kerala) is preserved because it contains very rare species of plants and animals. Silent Valley National Park is a beautiful representation of the last remaining rain forest of Kerala. It is located in the Nilgiri hills and has a core area of 89.52 km 2 . It is surrounded by a buffer zone of 148 km 2 . This national park has some rare species of flora and fauna. Silent Valley National Park was explored in 1847 by the botanist Robert Wight.

[#178] Hydrological cycle is under the control of
Correct Answer

(B) Forests and sunlight

Explanation

Solution: Hydrological cycle is under the control of Forests and sunlight. Hydrological cycle is a biogeochemical cycle that describes the continuous movement of water on, above and below the surface of the Earth. The level and flow of water depends on the forest cover also the sunlight which evaporates water from the surface.

[#179] Cadmium pollution is associated with disease
Correct Answer

(B) Itai-itai

Explanation

Solution: Cadmium pollution is associated with disease Itai-itai. Itai-itai disease is caused by cadmium (Cd) exposure, produced as a result of human activities related to industrialization, and this condition was first recognized in Japan in the 1960s. Itai-itai disease is characterized by osteomalaecia with severe bone pain and is associated with renal tubular dysfunction.

[#180] Plant die in water-logged soils due to
Correct Answer

(B) Stoppage of root respiration

Explanation

Solution: Plants die in water-logged soils due to Stoppage of root respiration. Waterlogging is excess water in the root zone accompanied by anaerobic conditions. The excess water inhibits gaseous exchange with the atmosphere, and biological activity uses up available oxygen in the soil air and water also called anaerobiosis, anoxia or oxygen deficiency, because of which roots cannot respire causing death of the plant.