Question: 133: Frugivorous birds are found in large numbers in tropical forests mainly because of :
(1) lack of niche specialisation
(2) higher annual rainfall
(3) availability of fruits throughout the year
(4) temperature conducive for their breeding
Answer: Option (3)
Explanation:
Frugivorous birds are birds that primarily feed on fruits.
Tropical forests show very high plant diversity and continuous vegetation growth throughout the year.
Because of this continuous growth, fruit-bearing plants are available in different seasons.
This ensures a year-round and abundant supply of fruits.
The constant availability of food supports large populations of frugivorous birds in tropical forests.
Although rainfall and temperature are favorable, the main reason for their large numbers is the continuous availability of fruits.
Hence, the correct answer is availability of fruits throughout the year.