In a hypothetical situation, a bacterium lives on the surface of a leaf, where it obtains nutrition from the leafʹs nonliving, waxy covering, while inhibiting the growth of

other microbes that are plant pathogens. If this bacterium gains access to the inside of a leaf, it causes a fatal disease in the plant. Once the plant dies, the bacterium

and its offspring decompose the plant. What is the correct sequence of ecological roles played by the bacterium in the situation described here? Use only those that

apply.

1.  nutrient recycler          2.  mutualist            3.  commensal              4.  parasite          5.  primary producer

#Question id: 10883

#Unit 10. Ecological Principles

Ecosystem having a three trophic level in which number of species is given in table

 Total 50 number of link among these trophic levels present. What is value of connectance in ecosystem? 

#Question id: 10884

#Unit 10. Ecological Principles

Herbivore ingests plant material with 1000 k j energy form producer and 300 kJ loss as feces waste; additionally herbivore invests 300 k j energy in respiration. What is production efficiency of that herbivore?

#Question id: 10885

#Unit 10. Ecological Principles

In a field experiment, autotrophs are provided a 14C-labelled carbon compound for photosynthesis. Radioactivity (14C) levels were then monitored at regular intervals in all the trophic levels. In which ecosystem is the radioactivity likely to be detected in longer time at the higher trophic level?

#Question id: 10886

#Unit 10. Ecological Principles

Much greater proportion of energy fixed by autotrophs is transferred to the herbivore level in the open ocean ecosystem than in a forest ecosystem because

#Question id: 10887

#Unit 10. Ecological Principles

What is a linkage density of community A and B RESPECTIVELY?

#Question id: 10888

#Unit 10. Ecological Principles

Ecologists have applied the top-down model to improve water quality in polluted lakes showing in picture. This approach, called biomanipulation, attempts to prevent algal blooms and eutrophication by altering the density of organism instead of chemical treatment as following