Q: 112 (CDS-I/2014)

In a forest, animals like voles and wood lice feed on plant roots and barks respectively. Among the other carnivores, foxes, shrews and owls are present in that forest. Following predictions are made by a group of observers who have visited the forest :
1. If the roots of the tree develop a disease, then voles and foxes will starve and not the owls.
2. Population of voles is dependent on wood lice population through food web.
3. If owl population declines, it will indirectly affect wood lice population.
4. If barks of tree are affected due to a disease, then reduction of wood lice will affect the shrew population forcing owls to eat more voles.
Which of the above predictions is/are correct?
question_subject: 
Science
question_year: 
2014
question_exam: 
CDS-I
stats: 
0,96,2016,760,464,360,528