Arrange the given taxa of invertebrates in terms of their increasing…

The correct answer is Option (3) → (D), (B), (A), (C)

The book’s pie chart of invertebrates (shown below) gives the share of species in each group. Read the slices from the smallest to the largest:

(D) Crustaceans — first. The thinnest slice of the invertebrate pie.

(B) Molluscs — second. A little larger than the crustaceans.

(A) Other animal groups — third. All the remaining invertebrate groups together make a bigger slice than molluscs.

(C) Insects — fourth. Insects fill most of the pie; they are by far the richest group of animals in species.

NCERT Extract:
Biodiversity – “… Let us look at some interesting aspects about earth’s biodiversity based on the currently available species inventories. More than 70 per cent of all the species recorded are animals, while plants (including algae, fungi, bryophytes, gymnosperms and angiosperms) comprise no more than 22 per cent of the total. Among animals, insects are the most species-rich taxonomic group, making up more than 70 per cent of the total. … In Figure 13.1, biodiversity is depicted showing species number of major taxa.”