Environment Ecology

Q421.Which of the following shows density gradient of water system?

Q422.The greatest diversity of plants and animals is characteristic of

Q423.Concerning ‘fly ash’ produced by the power plants using coal as fuel, which of the following statements is/are correct? 1. Fly ash can be used in the production of bricks for building construction. 2. Fly ash can be used as a replacement for some of the Portland cement concrete. 3. Fly ash is made up of silicon dioxide and calcium oxide only, and does not contain any toxic elements. Select the correct answer using the code given below.

Q424.In the grassland, trees do not replace the grasses as a part of an ecological succession because of

Q425.In India, in which one of the following types of forests is teak a dominant tree species?

Q426.Which of the following statements about Radioactive pollution are correct? 1. It causes a hereditary change in the animals. 2. It causes disbalance among different minerals in the soil. 3. It hinders blood circulation. 4. It causes carcinogenesis. Select the correct answer from the code given below.

Q427.Which one of the following is the correct sequence of the phases of biotic succession?

Q428.Which of the following city of India is specialised in the plantation?

Q429.Concerning bio-toilets used by the Indian Railways, consider the following statements. 1. The decomposition of human waste in their toilets is initiated of by fungal inoculum. 2. Ammonia and water vapour are the only end products in this decomposition which are released into the atmosphere. Which of the statements given above is/are correct?

Q430.Which one of the following is the correct order of biological organisation ranging from organism to biosphere?

Q431.Which country has the highest percentage of its geographical area under forest?

Q432.Which of the following can be found as pollutants in the drinking water in some parts of India? 1. Arsenic 2. Sorbitol 3. Fluoride 4. Formaldehyde 5. Uranium Select the correct answer using the code given below.

Q433.Consider the following statements relating to the ecosystem. 1. The term ecosystem was first used by A.G. Tansley. 2. Those organisms which produce their food themselves are termed as autotrophs. 3. Consumers consume their food through the process of photosynthesis. 4. Decomposers convert inorganic matter into organic matter. Which of the above statements are correct? Code

Q434.Which of the following forests is known as the ‘lungs of the planet earth’?

Q435.The acidification of oceans is increasing. Why is this phenomenon a cause of concern? 1. The growth and survival of calcareous phytoplankton will be adversely affected. 2. The growth and survival of coral reefs will be adversely affected. 3. The survival of some animals that have phytoplankton larvae will be adversely affected. 4. The cloud seeding and formation of clouds will be adversely affected. Which of the statement(s) given above is/are correct?

Q436.Which of the following statements is true about Bionomics? 1. It means ‘management of life’. 2. It is a synonymous with ecology. 3. It stresses on the value of natural systems which influence human systems. Code

Q437.In which of the following continents, the tropical deciduous forests are most extensive?

Q438.In the cities of our country, which among the following atmospheric gases are normally considered in calculating the value of Air Quality Index? 1. Carbon dioxide 2. Carbon monoxide 3. Nitrogen dioxide 4. Sulphur dioxide 5. Methane Select the correct answer using the code given below.

Q439.In the context of ecosystem productivity, marine upwelling zones are important as they increase the marine productivity by bringing the 1. Decomposer micro-organisms to the surface. 2. Nutrients to the surface. 3. Bottom-dwelling organisms to the surface. Which of the statements given above is/are correct?

Q440.Which of the following countries has passed a resolution to maintain forest on 70% land of its geographical area?