Biology Study Set 13
Quiz 46 :
Community Structure and Biodiversity
Habitat is defined as a living or dwelling place of an organism. In a habitat, one can find a large number of species interacting with living as well as non-living components of environment. Hence, the option (d) all of the above are correct.
Phasmids show a property of camouflage. It is one of the defense mechanism used by these organisms. When he falls on ground, it seems as if they are dead but actually they are saving themselves from predators. They actually do so by bringing their legs together and then insert their spines to inflict a painful wound. Some species of phasmids make a loud, starting, hissing sound using their wings. In this way they show a variety of defensive mechanisms to save them from predators.
Ecological niche explains how an organism or population behaves to the distribution of resources and their competitors in a community. In addition, niche also helps in understanding the sum of activities and relationships by which individuals of a species feel secure and can easily use resources for their survival and reproduction. Hence, the options (a) the sum of activities and relationships by which individuals of a species secure and use resources is correct. In an ecological niche, distribution of resources is same all through for all individuals. It may or may not vary in a specified area. Hence, option (b) unvarying for a given species is incorrect. It is observed that in an ecological niche, there are so many things such as resources can bring about changes in large or small ways. Hence, option (c) something that shifts in large and small ways is correct. Thus, option (d) both a and c is correct.