Question

All of the following can affect biodiversity except
A. Habitat fragmentation
B. Biological magnification
C. Contour ploughing
D. Introduction of non native species
E. Desertification of land

Answer 1

Hint: Biodiversity is the combined diversity of all levels of biological organisation. It includes the overall well being of the components in it. Certain factors lead to the disruption of the well being of biodiversity.

Step by step answer:The biodiversity is preserved when the species present, ecosystems, and other components are well maintained. But because of certain factors, biodiversities are disrupted easily.
Habitat loss and fragmentation lead to the disruption of biodiversity very easily and it is the most serious threat. This happens when there is overexploitation of the habitats by the surrounding human population. It prevents natural processes like migration from occurring and the animals are forced to live in unfavorable conditions.
-Biomagnification is also contributing to this. Toxic substances emitted to the surroundings by humans get accumulated in the food chains and are passed to higher trophic levels. This process is called biomagnification.
-In case when alien species are introduced to other well functioning ecosystems. They may turn invasive leading to the extinction of the native species which was already present.
-Desertification of land is another way of biodiversity disruption that leads to a reduction in the number of species and disruption of natural habitats.
-Contour ploughing practice is a method of farming in hilly areas by preserving the natural shape of the topography. It also prevents soil erosion by holding the soil by the roots of the plants farmed.
Hence the correct option is C- contour ploughing.

Note: Contour ploughing differs from the similar farming practice called terrace farming. In terrace farming, the normal shape of the slope is altered to make flat surfaces for cultivation. Both are used to prevent the erosion of fertile topsoil from the hilly areas.