A 72-year-old man had surgery to remove an abdominal tumor. Pathohistologic studies reveal that the tumor mass contains a large number of blood vessels. An increase in which of the following is the most likely stimulus for the growth of vessels in a solid tumor?

#Question id: 12545

#Unit 10. Ecological Principles

#Question id: 12543

#Unit 10. Ecological Principles

Use Figure to answer the following questions. Examine this food web for a particular terrestrial ecosystem. Each letter is a species. The arrows represent energy flow.

Which species is most likely an omnivore?

#Question id: 11651

#Unit 10. Ecological Principles

Succession on a newly exposed site that was not previously occupied by soil and vegetation refers to

#Question id: 11652

#Unit 10. Ecological Principles

The sequence of changes initiated by disturbance is called succession, and the ultimate association of species achieved is called

#Question id: 11653

#Unit 10. Ecological Principles

Given some characteristics of the climax community

i) Tolerate its own reactions

ii) Tends to become mesic

iii) Less stable

iv) Complex stratification

v) Simple food web

vi) Less mutualism

vii) Gross production is equals to community respiration

viii) Net community production is zero

Which of the following combination shows the characteristics of climax community?

#Question id: 11654

#Unit 10. Ecological Principles

Succession start from the water body and continuos in community dyanamics, changes species composition as well as changes in structure also. Which one is the correct composition of hydrosere process?