Question

Arrange the following in descending order of number of species in the Amazonian rain forest.
(a) Plants
(b) Birds
(c) Fishes
(d) Invertebrates
(e) Mammals
Choose the correct answer from the options given below:

• A. \(\text{(b)} \gt \text{(a)} \gt \text{(d)} \gt \text{(c)} \gt \text{(e)}\)
• B. \(\text{(c)} \gt \text{(b)} \gt \text{(d)} \gt \text{(e)} \gt \text{(a)}\)
• C. \(\text{(d)} \gt \text{(a)} \gt \text{(c)} \gt \text{(b)} \gt \text{(e)}\)
• D. \(\text{(e)} \gt \text{(b)} \gt \text{(a)} \gt \text{(c)} \gt \text{(d)}\)

Hint:

Invertebrates represent the largest share of global species diversity, followed by plants. Mammals and amphibians have roughly equal species counts (\(427\)) in the Amazonian rainforest, which is higher than reptiles (\(378\)).

Answer 1

The Correct Option is C

Concept:

• The Amazonian rain forest in South America has the greatest biodiversity on Earth.

• The approximate species counts for various groups in this ecosystem are: itemize

• Invertebrates: More than \(125,000\) species

• Plants: More than \(40,000\) species

• Fishes: Around \(3,000\) species

• Birds: Around \(1,300\) species

• Mammals: Around \(427\) species

• Amphibians: Around \(427\) species

• Reptiles: Around \(378\) species
itemize

Step 1: Compare the species numbers of the given groups
Comparing the values: \[ 125,000\ (\text{Invertebrates}) \gt 40,000\ (\text{Plants}) \gt 3,000\ (\text{Fishes}) \gt 1,300\ (\text{Birds}) \gt 427\ (\text{Mammals}) \]

Step 2: Arrange in descending order
Mapping the groups to their letters:

• Invertebrates = (d)

• Plants = (a)

• Fishes = (c)

• Birds = (b)

• Mammals = (e)
The descending order is \(\text{(d)} \gt \text{(a)} \gt \text{(c)} \gt \text{(b)} \gt \text{(e)}\).