Ecology multiple Q/As
- (B) The species invaders will face resistance from the species diversity for a while before they are accepted into the heard. This is a universal phenomenon that happens to most species in the globe where after resistance for a while acceptance follows.
- (B) The surface fish populations would decline due to reduced due to reduced populations of algae. This is because, with reduced whales, there is reduced amount of nutrients for algae growth which is the source of food for surface fish. Whale’s excretion on the ocean surface provides the algae with a good growth environment and nutrients. A decreased population of whales means no enough excretion which in turn means no algae growth.
- (A). Tropical level IV has approximately 500 J of available energy. As we move up the chain energy is lost at each level in respiration and other activities. Therefore the energy levels reduce as the energy moves from level to level. In the scenario given, the tropical level II has 50,000 J of energy. This means that level I has 500,000 J of energy. The third level has 5,000 J of energy leaving level IV with 500 J of energy.
- (D). Building ponds in the areas of dry land to promote interbreeding of the separated species. This will help the amphibian’s conditions in the dry areas to improve and eventually start breeding. Creating a good breeding environment is essential for the amphibians.
- (C) the ice blocks the light, so in years with more ice coverage, there is less photosynthesis by phytoplankton. For growth and development of phytoplankton, sunlight is essential. When the waters are covered in ice, the sun can penetrate and enhance the growth of the phytoplankton sufficiently. In this condition, zooplankton thrives due to the available food without limitation which in turn helps the fish thrive.