Question: 104: Give the correct descending order of organisms with reference to their estimated number found in Amazon forest.
(a) Plants
(b) Invertebrates
(c) Fishes
(d) Mammals
(e) Birds
Choose the correct answer from the options given below :
(1) (a) > (b) > (e) > (d) > (c)
(2) (a) > (c) > (d) > (b) > (e)
(3) (b) > (a) > (e) > (d) > (c)
(4) (b) > (a) > (c) > (e) > (d)
Answer: Option (4)
Explanation:
The Amazon forest is the most biologically diverse ecosystem on Earth, containing a vast number of species across different groups of organisms.
Invertebrates form the largest group in terms of species diversity and population size due to the presence of numerous insects, arthropods, and other small organisms.
Plants are the next most abundant group, with an extremely high diversity of trees, shrubs, herbs, and climbers.
Fishes are also highly diverse in the Amazon basin because of the extensive river systems and aquatic habitats.
Birds are present in large numbers but are fewer in species compared to fishes and plants.
Mammals have the least number of species among the given groups in the Amazon forest.
Therefore, the correct descending order of organisms is
(b) > (a) > (c) > (e) > (d).
Hence, the correct answer is Option (4).