Question

Answer the ones you know please

QUESTION 1 Plant succession is largely controlled by competition among plants for light, and shade tolerance is a key parameter for succession True False QUESTION 2 Habitat fragmentation is a side effect of agriculture True False QUESTION 3 The conservation corridors have a number of advantages except A. Decrease the genetic variation . Increase populations Decrease inbreeding D. Provide alternative refuges from large disturbances QUESTION 4 The push-pull strategies work well for many crops, which of the following strategy is INCORRECT? A Visual distraction is a push strategy B. Non-host volatiles are a push strategy Alarm pheromones is a pull strategy D. Sex pheromones is a pull strategy QUESTION 5 For the successful biological control on prickly pear, which of the following statements is INCORRECT? A. Prickly pear is native to America . Since Prickly peat was introduced to Australia, it spread quickly and occupied > 40K km2 in 60 years. C. The prickly peart was under control by introducing a moth species in 1914 D. After 1940, the prickly peart was completely under control

Answer 1

Question 2) false

Agriculture is not the reason for habitat fragmentation. It is due to manly activites like fossil harvesting for fules, dredging rivers, bottom trawling, deforestion , urbanization, filling in wetlands. This lead to fragmentation of forest and species extinction or migration.

Question 3) option c is correct, decrease inbreeding

Habitat corridor play an important part in animal endangered species. They allows movement of animals thus increase genetic diversity by de reading inbreeding.

Question 4) option D, sex pheromo6ia a pull strategy.

In push pull strategy.

Pull is the plant use to attract pesticides to spare the desired plant .

This technology involves use of behaviour-modifying stimuli which is able to manipulate the distribution as well as the abundance of stemborers and beneficial insects for management of stemborer pests. It use chemical not sex pheromones .

Question 5)) option c is wrong

Prickly pearl was controlled after introduction of mith species in 1914.

Yes a biological controller moth was introduced to control it but it was introduced in late 1920 not in 1914.