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

Step 1: Recall the Amazon biodiversity figures.
The Amazonian rain forest holds the richest biodiversity on Earth, and NCERT gives approximate species counts for several groups.
Step 2: List the group with the highest count.
Invertebrates top the list with more than $125000$ species. That is group (d).
Step 3: Place plants next.
Plants come next with more than $40000$ species, which is group (a).
Step 4: Place fishes and birds.
Fishes are about $3000$ species, group (c), and birds are about $1300$ species, group (b). So fishes rank above birds.
Step 5: Place mammals last.
Mammals are about $427$ species, group (e), the smallest of these groups.
Step 6: Arrange in descending order.
Putting them together gives (d) > (a) > (c) > (b) > (e), which is option 3.
\[ \boxed{\text{(d)} \gt \text{(a)} \gt \text{(c)} \gt \text{(b)} \gt \text{(e)}} \]