Name an omnivore which occurs in both grazing food chain and the decomposer food chain.
Cockroaches and crow are two omnivore, that are present in both grazing or predator and detritus food chain.
Justify the pitcher plant as a producer.
Pitcher plant (Napenthes) is an insectivores plant, which is chlorophyllus and capable of trapping solar radiations for chemical energy for photosynthesis. It is infectivorous plant which are produced in the soil lacking nitrogen thus to make up their nitrogen deficiency they trap insects.
Name any two organisms which can occupy more than one trophic level in an ecosystem.
Human being (man) and birds (sparrow) can be frequently seen in more than one trophic level, in an ecosystem.
In the North East region of India, during the process of jhum cultivation, forests are cleared by burning and left for regrowth after a year of cultivation. How would you explain the regrowth of forest in ecological term?
Forests that are cleared by burning and left for regrowth will show secondary succession. Since, soil is already present, the buried seeds oen to germinate. Due to wind dispersal and some other natural forces, new seeds will be brought into the area and new species will colonise the forest again.
Climax stage is achieved quickly in secondary succession as compared to primary succession. Why?
The rate of ecological succession is quicker in secondary succession as compared to primary succession as the soil (substratum) is already available for further succession. While in primary succession, the succession starts from bare rocks. Which take time for first colonisation by plants as there is no nutrient holding mechanisms.