Chapter 4, Problem 11A

Summary Introduction

Introduction :

The diagram given is of the finch bird which is suffering from an eye disease. Avian conjunctivitis is an eye infection which occurs in many species of the song bird but is commonly seen in finches. Due to this eye infection, bird is not able to see.

Answer to Problem 11A

Correct answer :

The correct answer is option (b) the bird cannot find food or water.

Explanation of Solution

Explanation/justification for the correct answer :

Option b) the bird cannot find the food or water. Avian conjunctivitis is a bacterial disease in which infection spread at bird feeders. Bird can easily contaminate the seed simply by visiting the feeder and when a sick bird finds a feeder, it may be reluctant to leave that food source because it cannot see due to the infection. Hence, the life’s span of the bird decreases. So, the correct option is option b).

Explanation for incorrect answer :

Option a) the bird cannot mate. Matting of bird does not reduce or increase the chances of survival, as matting results in the increase in the population of a particular species. Hence, reduce matting results in decrease in the population of that particular species.

Option c) the bird spreads the disease to others. Birds spread this disease to other, results in increase in the spread of the disease, but it is not directly related with the survival of the species.

Option d) the bird cannot survive a temperature change. If there occurs temperature change in a particular environment, then birds migrate to a place where there is favorable temperature for their living.