A. Which of the following about competition is true? A Preemptive competition is

Question

A. Which of the following about competition is true? A Preemptive competition is seen between predators and their prey. B. The example of over story trees outcompeting understory shrubs is an example of defended competition. C. When a predator finds another prey species by chance while searching for a particular prey species, this is an example of territorial competition. Q D. Plants can use allelopathy to chemically defend themselves from herbivores. B. An example of primary succession is A. grasses colonizing sand dunes. B. shrubs colonizing a burned forest. C. lichens colonizing a rock. D. Both A and C. E. crabgrass colonizing an abandoned wheat field. of the following is a negative functional response made by a predator in response to a decrease e in prey density? A. decrease in predator reproduction rate B. decrease in predator mortality rate C. increase in predator survival rate D. immigration of predators to an area of high prey density

Explanation / Answer

A. The correct option is D - Plants can use allelopathy to chemically defend themselves from herbivores.

Plants have various defense systems to repel and protect themselves from herbivores. One of them is allelopathy. Plants produce certain chemicals thaat act as toxin to herbivores and some may reduce the digestibility.

B. The correct option is D. Both A and C

Primary succession is defined as the succession that involves species change where no biological legacy involved. In desert and on rocks there is no possibility to have any biological legacy.

C. The correct option is A - decrease in predator reproduction rate

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