Environmental Science In Agricultural - Study Mode
[#206] From the following which has maximum efficiency to convert solar energy into chemical energy?
Correct Answer
(D) Chlorella
Explanation
Solution: Chlorella has maximum efficiency to convert solar energy into chemical energy. Chlorella is a genus of about thirteen species of single-celled green algae of the division Chlorophyta. Their chloroplasts contain the green photosynthetic pigments chlorophyll-a and -b. In ideal conditions cells of Chlorella multiply rapidly, requiring only carbon dioxide, water, sunlight, and a small number of minerals to reproduce. Chlorella could convert 20% of solar energy into a plant that, when dried, contains 50% protein.
[#207] Major health effects due to depletion of ozone layer is/are
Correct Answer
(D) All of the above
Explanation
Solution: Major health effects due to depletion of ozone layer are Increase in eye cataracts and mutation, Increase in skin cancer and melanoma and also a decrease in growth of ocean flora and fauna. Ozone layer depletion increases surface UVB levels, which could lead to damage, including an increase in skin cancer. The ozone hole was seen as a "hot issue" and imminent risk as laypeople feared severe personal consequences such as skin cancer, cataracts, damage to plants, and reduction of plankton populations in the ocean's photic zone.
[#208] Man has created his own special environment. What is it called?
Correct Answer
(C) Noosphere
Explanation
Solution: Man has created his special environment. It is called a Noosphere. The word is derived from the Greek Noo word means "mind", "reason" and "sphere", in lexical analogy to "atmosphere" and "biosphere". The noosphere shares the common thesis that together human reason and scientific thought have created, and will continue to create, the next evolutionary geological layer. This geological layer is part of the evolutionary chain.
[#209] The Earth capital is/are
Correct Answer
(D) All of the above
Explanation
Solution: The Earth's capital are Air, water and soil, Wildlife, raw materials and minerals, and Energy resources and degradation. The earth's capital includes organisms, plants and animals that have resources like air, water, land, soil for come and gone, but some have stayed.
[#210] Which of the following produce another air pollutant by reacting with oxides of nitrogen in presence of sunlight?
Correct Answer
(A) O 3
Explanation
Solution: O 3 produces another air pollutant by reacting with oxides of nitrogen in presence of sunlight. High levels of nitrogen dioxide are also harmful to vegetation damaging foliage, decreasing growth or reducing crop yields. Nitrogen dioxide can fade and discolour furnishings and fabrics, reduce visibility, and react with surfaces. In the sunlight, oxygen reacts with nitrogen oxides emitted mainly from vehicles, power plants, and industrial activities to form ozone, which in turn helps the formation of organic aerosol.